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Academic literature on the topic 'Neoarchean'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Neoarchean"

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Lubnina, N. V., and A. I. Slabunov. "Karelian сrаtоn in the struсturе of the Nео-Аrсhаеаn supercontinent Kеnоrlаnd: nеw paleomagnetic and isotopic-geochronological data on granulites of the Onega complex." Moscow University Bulletin. Series 4. Geology, no. 5 (October 28, 2017): 3–15. http://dx.doi.org/10.33623/0579-9406-2017-5-3-15.

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New paleomagnetic and isotopic-geochronological data obtained for Neoarchean Onega granulite complex, were used to reconstruct the position of the Karelian craton in the Neoarchean supercontinent Kenorland. Geological correlations were made for the Karelian, Kaapvaal, Pilbara, Superior, and Slave cratons. Comparison of independent geological and paleomagnetic data allowed us to propose a new configuration of the Neoarchean supercontinent Kenorland. The position of the ancient core of the Karelian craton (the Vodlozero terrane), located in the North-Western margin of the supercontinent structure, reconstructed based on the previously paleomagnetic data for the Neoarchean Panozero sanukitoid massif and new one for granulite of Onega complex.

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Li, Dapeng, Yuelong Chen, Guoliang Xue, Huan Kang, Yang Yu, Jianzhen Geng, Yulong Zhang, and Ting Li. "Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off." GSA Bulletin 132, no. 9-10 (March 9, 2020): 2119–34. http://dx.doi.org/10.1130/b35522.1.

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Abstract Fundamental geodynamic changes from vertical tectonics to lateral subduction occurred during the Neoarchean, yet detailed processes related to this transition and initiation of modern-style subduction remain enigmatic. Successive Neoarchean magmatic rocks including both plume-derived komatiites and subduction-related supracrustal and intrusive rocks appeared and preserved key information on the late Archean geodynamic changes in the Western Shandong Province granite-greenstone belt (WSP), North China Craton. In this study, whole-rock geochemical and Sm-Nd isotopic data and zircon U-Pb and Lu-Hf isotopes are reported for early Neoarchean supracrustal and intrusive rocks for the WSP. Temporally, the early Neoarchean magmatic movements in the WSP can be subdivided into two stages, including the early stage (2.77–2.69 Ga) and the late stage (2.69–2.60 Ga). Spatially, from southwest to northeast, intrusive rocks with similar ages define three belts (A, B, and C). Early stage tholeiitic and enriched meta-basalts were plume-related, representing oceanic crust opening from a pre-early Neoarchean continent. Slab subduction at least initiated at ca. 2.74 Ga and generated various Neoarchean tonalite-trondhjemite-granodiorites, quartz diorites, and arc-related volcanic rocks and mafic intrusions. Episodic emergence of meta-basaltic rocks and/or mafic intrusions with depleted εHf(t) values and low (La/Yb)N ratios indicates frequent slab break-offs during ca. 2.70–2.68 Ga, 2.66–2.64 Ga, and 2.62–2.60 Ga due to a relatively hotter mantle and regional heating by mantle plume. Secular geochemical changes of mafic and felsic rocks in this study outline roles of slab subduction in contributions of cooling the mantle, secular mantle refertilization, and crustal growth.

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Hinchey, Alana M., William J. Davis, James J. Ryan, and Léopold Nadeau. "Neoarchean high-potassium granites of the Boothia mainland area, Rae domain, Churchill Province: U–Pb zircon and Sm–Nd whole rock isotopic constraintsThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh." Canadian Journal of Earth Sciences 48, no. 2 (February 2011): 247–79. http://dx.doi.org/10.1139/e10-071.

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The Boothia mainland region of the north-central Rae domain is underlain by remnants of a Neoarchean volcano sedimentary sequence dismembered by two regionally extensive Neoarchean high-potassium granitoid suites with rare occurrences of a structurally interleaved, Paleoproterozoic sedimentary cover sequence. The granitoids and their gneissic equivalents are dominated by variably deformed and metamorphosed I-type, metaluminous, polyphase, commonly porphyritic to augen, biotite ± hornblende monzogranite, and subordinate granodiorite, with rare tonalite. New geochronological results, the first for this area, demonstrate that the widespread Neoarchean granitoid plutonism is dominantly 2.61–2.59 Ga, with a less prominent 2.66 Ga plutonic event. The age of zircon recrystallization suggests that ca. 2.60 Ga Archean metamorphism and fabric development (S1) affected the 2.66 Ga plutons prior to or contemporaneously with intrusion of the voluminous ca. 2.6 Ga suite. εNd(t) for the ca. 2.61–2.59 Ga suite range from 1.4 to –1.9, overlapping with the ca. 2.66 Ga suite that range from 1.4 to 1.5. The Nd isotopic data, coupled with the presence of inherited ca. 2.65, 2.70, and 2.85–2.90 Ga zircon, suggests recycling of older, Neoarchean to Mesoarchean crust in the formation of these suites. Metaplutonic rocks preserve Paleoproterozoic deformation (F4 and F5) and amphibolite-facies metamorphism, sporadically recorded in zircon rims that formed at 1.81 Ga. This event strongly reoriented the Neoarchean fabrics in metaplutonic rocks, generally without the development of a new coaxial Paleoproterozoic fabric, and we attribute this strain and metamorphism to the Hudsonian orogeny.

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Ludden, John, and Andrew Hynes. "The Lithoprobe Abitibi-Grenville transect: two billion years of crust formation and recycling in the Precambrian Shield of Canada." Canadian Journal of Earth Sciences 37, no. 2-3 (April 2, 2000): 459–76. http://dx.doi.org/10.1139/e99-120.

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We summarize the results of Lithoprobe studies in the Neoarchean southeastern Superior Province and the Mesoproterozoic Grenville Province, in the southeastern Precambrian Shield of Canada, through two composite cross-sections based on seismic reflection data, which define dramatically different styles of crust formation and tectonic accretion in the Neoarchean and Mesoproterozoic. In the Neoarchean, the structures at the surface are steep, with discontinuous and flatter structures at depth, much of the crust appears to be juvenile, and the predominant process of crustal growth is inferred to have been subduction-accretion of primitive crust in a prograding arc system. In the Mesoproterozoic, surface structures are shallow and the seismic character of the crust is continuous over the entire cross-section. Archean parautochthonous rocks and reworked Archean crust comprise a very significant proportion of the preserved crust in the Mesoproterozoic and provided the backstop to the Grenvillian orogeny, resulting in the exhumation of crustal rocks formed at high pressures. Preservation of Neoarchean crust, including a thickened lithosphere in the Superior Province, in contrast to its general destruction in younger orogens, may well relate to a unique thermal regime at this time on Earth.

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Kazmierczak, J. "Neoarchean Biomineralization by Benthic Cyanobacteria." Science 298, no. 5602 (December 20, 2002): 2351. http://dx.doi.org/10.1126/science.1075933.

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Flannery, David T., Abigail C. Allwood, Robert Hodyss, Roger Everett Summons, Michael Tuite, Malcolm R. Walter, and Kenneth H. Williford. "Microbially influenced formation of Neoarchean ooids." Geobiology 17, no. 2 (November 18, 2018): 151–60. http://dx.doi.org/10.1111/gbi.12321.

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Grace, Rashmi LB, Kevin R. Chamberlain, B. Ronald Frost, and Carol D. Frost. "Tectonic histories of the Paleo- to Mesoarchean Sacawee block and Neoarchean Oregon Trail structural belt of the south-central Wyoming Province." Canadian Journal of Earth Sciences 43, no. 10 (October 1, 2006): 1445–66. http://dx.doi.org/10.1139/e06-083.

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The Sacawee block is a narrow belt of Paleo- to Mesoarchean crust that extends for ~70 km across the northern Granite Mountains. It is composed of the ~3.3 Ga Sacawee orthogneiss, additional calc-alkalic and tonalitic orthogneisses, and the ~2.86 Ga Barlow Gap Group. The Sacawee block basement is characterized by negative εNd values and Paleoarchean Nd crustal residence model ages. A broad east–west-trending zone of Neoarchean high strain, which is part of the Oregon Trail structural belt, transects the Sacawee block and was studied at two locations, the Beulah Belle Lake area and West Sage Hen Rocks. U–Pb analyses of magmatic zircon from a sheared amphibolite within the high-strain zone of the Beulah Belle Lake area constrain the age of the Neoarchean deformation to be later than 2688 ± 5 Ma. At West Sage Hen Rocks, metamorphic zircons in a sheared amphibolite provide a direct date on the shear zone of 2649 ± 2.8 Ma. These data, combined with similar ages of deformation from two other shear zones, are interpreted to suggest that the Neoarchean Oregon Trail structural belt is a pervasive feature of the Sacawee block and may represent a deformation front related to accretion. Multiple east–west-trending shear zones within the Sacawee block are evidence for tectonic modification of the crust between ~2.65 and 2.63 Ga and horizontal convergence analogous to modern plate tectonics processes. The Sacawee block is either a rare exposure of ancient basement typical of that which originally underlay much of the Wyoming Province or it is an exotic block that was accreted to the core of the Wyoming Province in Neoarchean time.

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Singh, Vinod K., Sanjeet K. Verma, Pradip K. Singh, A. I. Slabunov, Sumit Mishra, and Neeraj Chaudhary. "Archean crustal evolution of the Bundelkhand Craton: evidence from granitoid magmatism." Geological Society, London, Special Publications 489, no. 1 (November 7, 2019): 235–59. http://dx.doi.org/10.1144/sp489-2018-72.

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AbstractThis study presents petrological and geochemical data on Neoarchean granitoids from the northern and central parts of the Bundelkhand Craton to discuss its crustal evolution and tectonic history. The study deals with two granitoid suites, i.e. tonalites–trondhjemites–granodiorites (TTG) and sanukitoids. TTGs are characterized by high SiO2, Na2O and mostly low to moderate Mg#. They display enrichment in light rare earth elements, low to moderately fractionated heavy rare earth elements (HREE) and low Sr/Y ratios, suggesting their high-HREE character or low-pressure origin from melting of a mafic protolith. The sanukitoid samples show relatively low SiO2, high K2O (2.1–4.6 wt%), Pb, Sr and Ba, and moderate to low Mg#, Cr, Ni. These granitoids probably generated from partial melting of hydrous mafic rocks followed by interaction with a mantle peridotite. Geochemical characteristics, tectonic discrimination using ratios like (Ce/Pb)PM, (La/Nb)PM and (Th/Nb)PM and regional rock association suggest that the Neoarchean TTGs and sanukitoids were emplaced in a subduction setting. Combining the existing knowledge base, a schematic model for generation and evolution of crust from Paleoarchean to Neoarchean has been proposed for the Bundelkhand Craton.

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Mohan, M. Ram, Ajay Dev Asokan, and Simon A. Wilde. "Crustal growth of the Eastern Dharwar Craton: a Neoarchean collisional orogeny?" Geological Society, London, Special Publications 489, no. 1 (December 11, 2019): 51–77. http://dx.doi.org/10.1144/sp489-2019-108.

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AbstractThe Eastern Dharwar Craton (EDC) is predominantly made of Neoarchean potassic granitoids with subordinate linear greenstone belts. Available geochemical and isotopic systematics of these granitoids suggest variations in the source and petrogenetic mechanisms. By compiling the available geochemical data, these granitoids can be classified into four groups, namely: TTGs (tonalite–trondhjemite–granodiorite); sanukitoids; biotite and two-mica granites; and hybrid granites. This classification scheme is in line with the global classification of Neoarchean granites, and enables the sources and petrogenetic mechanisms of these variants to be distinguished. Available geochemical, isotopic and geochronological datasets of these granitoids are integrated and the existing tectonic models for the Neoarchean EDC are reviewed. The variability of the EDC granitoids is ascribed to crustal reworking associated with the collision of two continental blocks. The tectonomagmatic evolution of the EDC is analogous to the development of the Himalayan Orogeny. Based on the evolutionary history of the Dharwar Craton, it can be concluded that convergent margin tectonics were operational in the Indian Shield from at least c. 3.3 Ga and continued into the Phanerozoic. However, the nature and style of plate tectonics could be different with time.

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Li, Yilong, Jianping Zheng, Wenjiao Xiao, Guoqing Wang, and Fraukje M. Brouwer. "Circa 2.5 Ga granitoids in the eastern North China craton: Melting from ca. 2.7 Ga accretionary crust." GSA Bulletin 132, no. 3-4 (August 29, 2019): 817–34. http://dx.doi.org/10.1130/b35091.1.

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Abstract The Neoarchean crust-mantle interaction and crustal evolution of the North China craton are controversial and are instructive of the processes of continental crust growth and cratonic evolution. We present here a systematic study of the petrology, geochemistry, and geochronology of Neoarchean granitoids from the eastern North China craton to elucidate their petrogenesis and tectonic setting. The rocks were collected from the Jielingkou, Anziling, and Qinhuangdao plutons, and an amphibole-monzoporphyry dike in the Qinhuangdao pluton. Samples from the Jielingkou pluton, consisting dominantly of monzodiorite and diorite with minor monzonite and granodiorite, contain 52.2–64.4 wt% SiO2, 2.46–4.52 wt% MgO (Mg# = 0.41–0.54), 3.76–5.77 wt% Na2O, and K2O/Na2O ratios of 0.29–0.71. The Anziling pluton samples, comprising syenite and monzonite, display slightly higher SiO2 (60.9–66.7 wt%) and K2O/Na2O ratios (0.70–1.11), but lower MgO (1.54–2.33 wt%) and Mg# (0.40–0.47) values, compared to the Jielingkou rocks. The Qinhuangdao pluton samples, consisting mainly of granite and minor syenite and granodiorite, with some diorite and monzoporphyry dikes, are characterized by the highest SiO2 values (75.7–76.9 wt%) and K2O/Na2O ratios (0.73–1.41) and lowest MgO content (0.14–0.32 wt%) among the studied samples. The amphibole-monzoporphyry dike has intermediate SiO2 (56.3 wt%), high MgO (3.79 wt%), Na2O (5.55 wt%), and Mg# (0.45), and low K2O/Na2O ratio (0.66). Zircon U-Pb laser-ablation–inductively coupled plasma–mass spectrometry dating showed that all plutons have a ca. 2.5 Ga crystallization age. Zircon crystals have mildly positive εHf(t) values (+0.24 to +5.45) and a depleted mantle model age (TDM1) of ca. 2.7 Ga. We interpret the granitoid rocks as sanukitoid-related, Closepet-type granites, potassium-rich adakites, and potassium-rich granitoid rocks that crystallized in the late Neoarchean (2.5 Ga) and were derived from partial melting of mantle peridotite that was metasomatized with the addition of slab melt, thickened alkali-rich juvenile lower crust and juvenile metamorphosed tonalitic rocks. Mantle plume activity ca. 2.7 Ga is thought to have been responsible for the early Neoarchean tectono-thermal event in the eastern North China craton. This activity resulted in a major crustal accretion period in the craton, with subordinate crustal reworking at its margins. A steep subduction regime between ca. 2.55 Ga and ca. 2.48 Ga led to the remelting of older crustal material, with subordinate crustal accretion by magma upwelling from a depleted mantle source resulting in late Neoarchean underplating. This crustal reworking and underplating resulted in the widespread ca. 2.5 Ga plutons in the eastern North China craton. Continental crust growth in the North China craton thus occurred in multiple stages, in response to mantle plume activity, as well as protracted subduction-related granitoid magmatism during the Neoarchean.

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Dissertations / Theses on the topic "Neoarchean"

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Koebernick, Christa F. "Neoarchean coastal sedimentation in the Shebandowan group, northwestern Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ33400.pdf.

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Eroğlu, Sümeyya [Verfasser], and Ronny [Akademischer Betreuer] Schönberg. "Paleoenvironmental reconstruction of a Neoarchean oxygen oasis / Sümeyya Eroğlu ; Betreuer: Ronny Schönberg." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1196704139/34.

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Milidragovic, Dejan. "Neoarchean (2.7 Ga) reworking of the Ungava craton by Fe-rich parental magmas." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123146.

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The Neoarchean was a time of enhanced continental crust formation and wide-spread mafic magmatism related to global mantle melting. Mafic and ultramafic intrusions were emplaced across a large portion of the Ungava craton of the Northeast Superior Province, synchronous with the crystallization of large volumes of ca. 2.74-2.70 Ga intermediate to felsic plutonic rocks. The ca. 2.72-2.70 Ga mafic/ultramafic intrusions are locally known as the Qullinaaraaluk, Chateguay and Couture plutonic suites, and are herein referred to as the Q-suite. The Q-suite plutons have relatively unfractionated MREE/HREE ratios, variably elevated LREE/MREE ratios and strong depletions in HFSE, in particular Nb and Ta. The high Th/Yb ratios and chondritic to strongly radiogenic initial 143Nd/144Nd (2.72 Ga) ratios of the Q-suite intrusions suggest that their "calc-alkaline" trace element profiles may reflect the addition of significant tonalite-trondhjemite-granodiorite (TTG) component. The interaction between the Q-suite magmas and TTG crust is also evident in "hybrid" domains of intermediate-SiO2 content (50-65 wt. %) that form along the margins of some intrusions. These "hybrid" domains strongly resemble the intermediate-SiO2 members of the voluminous ca. 2.74-2.70 Ga pyroxene-bearing granitoids that make up more than 20% of the exposed surface of the Ungava craton. Mass-balance and thermodynamic modelling suggests that pyroxene-bearing granitoids with ~65 wt. % SiO2 contain a significant juvenile (Q-suite) component modified by 40-50 % addition of trondhjemitic melt of the pre 2.74 Ga TTG crust.Analyses of olivine (FoMax ≤ 0.84) from peridotitic and dunitic cores of the Q-suite intrusions (Mg-number≤ 0.82), suggest that their parental magmas were enriched in Fe relative to present-day MORB, or hot-spot related magmas. The Q-suite intrusions of western and southern Ungava craton crystallized from magmas of subalkaline affinity, in contrast to the intrusions of the north-central Ungava craton which are mildly subalkaline to mildly alkaline (transitional). Parental liquid compositions of the subalkaline and transitional Q-suite intrusions estimated using the program alphaMELTS are Fe-rich high-Mg basalts (MgO = 10 wt. %, FeOTOT = 13.5 wt.%, Al2O3 = 15 wt.% ), and Al-poor ferropicrites (MgO ~14 wt. %, FeOTOT = 17 wt.%, Al2O3 = 6.6 wt.%), respectively. These compositional differences may reflect melting of compositionally heterogeneous Fe-rich mantle sources under similar P-T conditions, or different degrees of melting of a common Fe-rich mantle source under different P-T conditions. The transitional parental magmas appear to represent high degree melts that last equilibrated with a harzburgitic residue, whereas the subalkaline parental magmas appear to represent lesser-degree partial melts that last equilibrated with a lherzolitic mantle residue. The craton-wide distribution of Q-suite plutons and the large inferred Q-suite component in the ca. 2.74-2.70 Ga pyroxene-granitoids, suggests that ferropicritic underplating may have been a significant driving force in the reworking of the Ungava craton. Ferropicrites of similar age have also been emplaced into the southern and western Superior Province, as well as the Slave, W. Churchill, Kaapvaal, Yilgarn and Karelia cratons. The identification of ferropicritic rocks in at least five other Archean cratons suggests that melting of Fe-rich mantle domains may have had an important role in global cratonization ca. 2.7 Ga.
Le Néoarchéen est caractérisé par un magmatisme mafique répandu relié à la fusion partielle du manteau à l'échelle globale et par une période intense de formation de croûte continentale. Des intrusions mafiques et ultramafiques sont mises en place dans l'ensemble du craton de l'Ungava, dans le secteur nord-est de la Province du Supérieur, simultanément à la cristallisation de grand volume de roches plutoniques de composition intermédiaire et felsique datées de ~2,72-2,70 Ga. Les intrusions mafiques et ultramafiques de ~2,72-2,70 Ga incluant les suites plutoniques Quillinaaraaluk, Chateguay et Couture forment une suite plutonique nommée ici la « suite-Q ». Les ratios Th/Yb sont élevés et les ratios initiaux de 143Nd/144Nd de la suite-Q sont chondritiques à fortement radiogéniques, ce qui suggèrent que leurs signatures en éléments traces typiques des roches calco-alcalines reflètent l'addition d'un volume important de roches de type TTG. L'interaction entre les magmas de la suite-Q et la croûte composée de TTGs s'observe également le long des marges de certaines intrusions, marges qui sont caractérisées par des concentrations en SiO2 plus élevées et représentent des zones compositionnelles hybrides. Ces marges hybrides sont semblables aux unités à composition intermédiaire en SiO2 appartenant aux granitoïdes à pyroxènes (~2,74- 2,70 Ga) qui représentent plus de 20% de la surface exposée du craton de l'Ungava. Des calculs indiquent que les granitoïdes à pyroxènes avec 65% poids de SiO2 contiennent une composante juvénile significative (suite-Q) modifiée par l'addition de 40-50 % d'un liquide trondhjémitique dérivé de la fusion partielle de la croûte de type TTG mise en place avant 2,74 Ga.Les analyses d'olivine des coeurs péridotitiques et dunitiques des intrusions de la suite-Q suggèrent que leurs magmas parents étaient enrichis en fer par rapport aux MORB ou aux magmas de points chauds modernes. Les intrusions de la suite-Q situées dans le secteur ouest et sud du craton de l'Ungava ont cristallisé à partir de magmas à affinité sub-alcaline contrairement à celles du centre-nord qui sont de compositions modérément sub-alcalines à légèrement alcalines (transitionnelles). Les liquides parentaux des intrusions sub-alcalines et transitionnelles de la suite-Q, modélisés à l'aide du logiciel alphaMELTS, sont des liquides basaltiques riches en fer et en magnésium et des liquides ferropicritiques pauvres en aluminium respectivement. Les différences compositionnelles peuvent être attribuées à la fusion de sources mantelliques riches en fer, à composition hétérogène, sous des conditions de pression et de température similaires, ou à différents degrés de fusion d'une source mantellique commune, riche en fer, sous des conditions de pression et de température différentes. Les magmas parents transitionnels semblent avoir été produits par des degrés de fusion partielle élevés et auraient par la suite été équilibrés avec un résidu harzburgitique du manteau. Au contraire, les magmas parents sub-alcalins pourraient représenter des magmas issus de degrés de fusion partielle plus faibles suivis de l'équilibrage de ces magmas avec un résidu lherzolitique du manteau.La grande distribution des plutons de la suite-Q dans le craton de l'Ungava et l'importante contribution d'une composante de la suite-Q dans les granitoïdes à pyroxènes âgés de ~2,74-2,70 Ga indiquent que l'accrétion par sous-placage de ferropicrite aurait joué un rôle moteur significatif dans le remaniement du craton. Des ferropicrites d'âges similaires ont également été mises en place dans le sud et l'ouest de la Province du Supérieur, ainsi que dans les cratons Slave, Churchill Ouest, Kaapvaal, Yilgarn et Karelia. L'identification de roches ferropicritiques dans au moins cinq autres cratons Archéens suggère que la fusion partielle de domaines mantelliques riches en fer aurait joué un rôle primordial dans la « cratonisation » globale à ~2,7 Ga.

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Brown, Julie Louise. "Neoarchean evolution of the western-central Wabigoon boundary zone, Brightsand Forest Area, Ontario." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6451.

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The boundary between the western and central domains of the Wabigoon subprovince has been considered to represent a ca. 2.7 Ga suture between juvenile Neoarchean volcanic rocks in the west and granitoid rocks with Mesoarchean ancestry in the central Wabigoon. The nature and timing of interaction between these two terranes was examined southeast of the Sturgeon Lake greenstone belt within the central Wabigoon, where amphibolite-facies supracrustal remnants are dismembered by Neoarchean plutonic rocks and shear zones. Of the 4 preserved ductile deformation fabrics, D1 and D2 are bracketed by a 2718 +/- 7 Ma tonalite gneiss and crosscutting 2715 Ma tonalite dyke. The main penetrative S3 foliation affects most units, including quartz-rich sandstone deposited after 2701 Ma. A 2697 Ma granodiorite dyke cutting S3 in mafic and metasedimentary rocks provides a lower bracket on D3. Regional implications can be drawn from the observation of 2725--2715 Ma D1 and D2 deformation events in the central Wabigoon. These constraints overlap with an early deformation event in the Pipestone Lake area of the western Wabigoon (2727--2712 Ma; Edwards and Stauffer, 1999). (Abstract shortened by UMI.)

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Diekrup, David. "Depositional Pathways and the Post-Depositional History of the Neoarchean Algoma-Type BIF in Temagami, ON." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39875.

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Algoma-type banded iron formation is common in Neoarchean greenstone belts, and many of its distinctive features such as the banding of iron-rich and silica-rich material and deposition in volcanic terranes have been ascribed to their deposition related to volcanic-hydrothermal activity and cyclic variability in depositional pathways. The work presented in this thesis tests these assumptions and presents a model for the deposition and post-depositional processes now represented by the petrography and geochemistry of a 2.73 Ga type-locality of Algoma-type BIF in Temagami, ON. Adsorption of components onto the surface of Fe-oxyhydroxides forming in the anoxic Neoarchean water column is the most likely process capable of transferring silica, as well as trace quantities of transition metals, rare earth elements, Ge, P, U and other components to the sediment. The petrogenesis of the Temagami BIF lithologies suggests ongoing recrystallization processes and volume loss reactions leading to the formation of magnetite layers, while jasper is identified as the most pristine lithology best representative of the initially deposited Fe-oxyhydroxide-silica gel. Recrystallization and volume loss reactions are controlled by the ongoing dewatering during compaction and diagenesis, without the influence of external hydrothermal or metamorphic fluids. When corrected for the volume loss and small amounts of clastic contamination, little residual variability can be observed in the composition of jasper and magnetite layers, indicative of an originally homogenous primary precipitate instead of sorted and layered material deposited on the seafloor. This model is in stark contrast to previous interpretations of seasonal variability in biologic activity, cyclical seasonal or hydrothermal events responsible for primary layering in BIF. Instead, very little direct input of hydrothermal components is recorded in the chemistry of the Temagami BIF, and elements abundant in high-temperature hydrothermal fluids such as sulfur are instead sourced from atmospheric sources and deposited by bacterial pathways. Lack of primary chemical variability and non-hydrothermally sourced components captured in BIF argue against a genetic link to local hydrothermal venting, but rather an open ocean depositional setting. As such, the Temagami BIF does not represent a marker horizon related to local or regional hydrothermal venting and potential formation of associated massive sulfide deposits but reflects processes and the chemistry of the open Neoarchean ocean.

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Van, Lankvelt Amanda L. "Protracted Magmatism within the North Caribou Terrane, Superior Province: Petrology, Geochronology, and Geochemistry of Meso- to Neoarchean TTG Suites." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24130.

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The North Caribou Terrane forms the core of Superior Province and records a protracted history of crustal growth and modification. At the centre of the North Caribou Terrane, lies the North Caribou greenstone belt, which is surrounded by granitoids of diverse compositions and ages. This study reports whole-rock geochemistry, zircon and titanite geochronology, and hornblende geobarometry on these plutonic rocks. Although zircons as old as 3132 ± 7 Ma were found, the main magmatic pulse occurred between 2880 and 2830 Ma, and geobarometry indicates tectonic thickening during this period. This was followed by widespread hydrothermal alteration and limited magmatism from 2760 to 2680 Ma, and shallow, brittle-ductile intrusions at circa 2630 Ma. From 2730 to 2630 Ma, intrusions were emplaced at increasingly shallow crustal levels. All of the rocks, except for the youngest pegmatitic intrusions, show similar patterns in major and trace elements, with a general trend toward more evolved compositions through time. These patterns indicate that the granitoids record mostly reworking of early intrusions, which is also consistent with patterns observed in the geochronology.

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Lodge, Robert Wilfred David. "REGIONAL VOLCANOGENIC MASSIVE SULPHIDE METALLOGENY OF THE NEOARCHEAN GREENSTONE BELT ASSEMBLAGES ON THE NORTHWEST MARGIN OF THE WAWA SUBPROVINCE, SUPERIOR PROVINCE." Thesis, Laurentian University of Sudbury, 2013. https://zone.biblio.laurentian.ca/dspace/handle/10219/2081.

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The ca. 2720 Ma Vermilion, Shebandowan, Winston Lake, and Manitouwadge greenstone belts (VGB, SGB, WGB, and MGB, respectively) are located along the northern margin of the Wawa subprovince. They are interpreted to have formed in broadly similar rifted arc to back-arc environments, but their base and precious endowment and, in particular, their endowment in VMS deposits, differ markedly. These difference is metal endowment reflect differences in their metallogenic history that were examined by comparing their regional, belt-scale lithostratigraphy, chemostratigraphy, petrogenesis and tectonic history constrained by new U-Pb zircon geochronology. The MGB is the most VMS-endowed and isotopically juvenile (Pb and Nd) greenstone belt. It has a trace element chemostratigraphy that is consistent with a rifted arc to back-arc environment. The trace element chemostratigraphy of the WGB is also consistent with a rifted-arc to back arc geodynamic setting. The Winston Lake VMS deposits formed during early rifting of the arc and their timing is tightly constrained at ca. 2720 Ma by U-Pb ages of the host felsic strata and post-VMS Zenith gabbro. The Zn-dominated VMS mineralization formed from hydrothermal fluids that were <300 ° and were possibly boiling in relatively shallow water. The trace element chemostratigraphy of the VGB, SGB, and WGB indicates a plume-driven rifted arc to back-arc geodynamic settings. The composition of VMS mineralization, lithofacies, and alteration in these belts are consistent with a relatively shallower-water environment, which may have compromised VMS formation. The high-Mg andesites that are typical of, but restricted to, the SGB formed during compressional “hot” subduction, which resulted in the development of a thicker arc crust. This thicker crust may have inhibited VMS formation, but favoured the formation of magmatic sulphide and gold mineralization. New detrital and magmatic zircon U-Pb geochronology allowed comparison and correlation of lithostratigraphy and metallogeny between the greenstone belts. U-Pb ages within the VGB also defined younger, Timiskaming-type volcanic and sedimentary strata that are coeval with similar deposits in the SGB. These strata are spatially and temporally associated with gold mineralization in both belts and are coeval with similar deformation and magmatic events in the WGB and along the northern margin of the Wawa-Abitibi terrane. This indicates that the formation of Timiskaming-type pull apart basins in the northern part of the Wawa-Abitibi terrane were synchronous, and earlier than in the southern part, which is consistent with oblique convergence of the Wawa-Abitibi terrane onto the Superior Province. Detrital zircon geochronology also revealed the presence of a >2720 Ma iv zircon population within the Timiskaming-type sedimentary strata of the SGB. This is consistent with their derivation from the Wabigoon subprovince and suggests trans-terrane transport of detritus in a foreland –type basin resulting from uplift of the Wabigoon subprovince during accretion of the Wawa subprovince.

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Said, Nuru. "Geochemistry of the Neoarchean mafic volcanic and intrusive rocks in the Kalgoorlie Terrane, eastern Yilgarn, Western Australia : implications for geodynamic setting." University of Western Australia. School of Earth and Environment, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0156.

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[Truncated abstract] The Neoarchean (2800 to 2600 Ma) Eastern Goldfields Superterrane (EGST) comprises elongated belts of deformed and metamorphosed volcanic and sedimentary rocks intruded by granitoids. The Superterrane is made up of five distinct tectonostratigraphic terranes. From west to east these are the Kalgoorlie, Gindalbie, Kurnalpi, Laverton and Duketon Terranes. The Kalgoorlie Terrane is characterised by 2720 to 2680 Ma marine mafic-ultramafic volcanic successions interlayered with, and overlain by, 2710 to 2660 Ma dominantly trondhjemite-tonalite-dacite (TTD) dacititic volcaniclastic rocks (Black Flag Group). The adjacent Gindalbie and Kurnalpi terranes are characterised by 2720 to 2680 Ma calc-alkaline volcanic successions representing oceanic island arcs. To the west of the EGST, the Youanmi Terrane is characterised by older, dominantly 3000 to 2900 Ma greenstone rocks and complex granitoid batholiths derived from older crustal sources. The southern Kalgoorlie Terrane comprises five elongate NNW-trending tectono-stratigraphic domains. Three principal marine komatiitic to basaltic suites, collectively referred to as the Kambalda Sequence, are present, including the wellpreserved massive to pillowed Lower and Upper Basalt Sequences, separated by the Komatiite Unit, as well as numerous dyke suites. The Lower Basalt Sequence comprises the Woolyeenyer Formation, Lunnon, Wongi, Scotia, Missouri Basalts and Burbanks and Penneshaw Formations, whereas the Upper Basalt Sequence contains the Paringa, Coolgardie, Big Dick, Devon Consols, Bent Tree, and Victorious basalts. ... Instead, the data suggest that discrete PGE-bearing phase (s) fractionated from the basaltic magmas. Such phases could be platinum group minerals (PGM; e.g. laurite) and/or alloys, or discrete PGE-rich nuggets. In summary, data on the three magmatic sequences record decompression melting of three distinct mantle sources: (1) long-term depleted asthenosphere for prevalent depleted tholeiitic and komatiitic basalts, and komatiites; (2) long-term enriched asthenosphere for Paringa Basalts and similarly enriched rocks; and (3) shortterm enriched continental lithospheric mantle (CLM) for HREE and Al-depleted dykes. Some of these rocks were contaminated by TTD-type melts. Taken with the existing geophysical and xenocrystic zircon data, the most straightforward interpretation is eruption of a zoned mantle plume at the margin of rifted continental lithosphere. The Kalgoorlie Terrane extensional basin was subsequently tectonically juxtaposed with the adjacent arc-like Gindalbie and Kurnalpi Terranes at approximately 2660 Ma at the start of orogeny in a Cordilleran-style orogen to form the EGST. Collectively, uncontaminated basalts have Nb/Th of 8-16, compared to 8-12 reported for the Lunnon basalts in a previous study. To a first approximation these asthenosphere melts are complementary to average Archean upper continental crust with Nb/Th =2, consistent with early growth of large volumes of continental crust rather than models of steady progressive growth.

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Wu, Meiling, and 吴美玲. "Ages, geochemistry and metamorphism of the neoarchean basement in Shandong province : implications for evolution of the eastern block, North China Craton." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/196017.

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The Archean basement rocks in Shandong Province are important components of the Eastern Block in the North China Craton, consisting predominantly of granitoid gneisses with minor mafic and felsic supracrustal rocks and charnockites. They are exposed, from west to east, in the Luxi Granite-Greenstone Terrane, Yishui Terrane and Jiaodong Terrane, of which the low-grade Luxi Granite-Greenstone Terrane has been well studied, whereas little work has been done on the medium- to high-grade Yishui and Jiaodong Terranes. Controversies have long surrounded the timing of crustal growth and tectonic setting of these two terranes. This project is designed to resolve these issues by integrating field investigations, petrography, geochronology, geochemistry and metamorphism of the Yishui and Jiaodong Terranes. New zircon U-Pb data from the major lithologies have revealed that the Jiaodong Terrane experienced multi-stage magmatism at ~2.9 Ga, ~2.7 Ga and 2.6-2.5 Ga followed by two metamorphic events at ~2.50 Ga and 1.9-1.8 Ga, whereas the Yishui Terrane underwent single magmatism at 2.57-2.53 Ga followed by a single metamorphic event at ~2.50 Ga. Zircon Hf isotopic data have revealed that the Jiaodong Terrane underwent juvenile crustal growth with significant ancient crustal material additions at 3.4-3.1 and 2.8-2.7 Ga, while the Yishui Terrane experienced juvenile crustal growth with significant addition of crustal material at 2.8-2.7 Ga. Both the Jiaodong and Yishui Terranes experienced crustal reworking with minor juvenile additions at 2.6-2.5 Ga. Whole-rock compositions and Nd isotopes from the Jiaodong granitoid gneisses suggest that their protoliths are typical Archean tonalitic-trondhjemitic-granodioritic (TTG) suite. They are high in SiO2, Al2O3, Na2O, Sr and Sr/Y ratios, but low in MgO, K2O, TiO2, Cr, Ni, Y and Mg#. They are generally enriched in light rare earth elements and large ion lithophile elements, depleted in heavy rare earth elements and high field strength elements, with slight Eu anomalies. Two groups of granitoid gneisses have been recognized: low- and high-HREE groups, of which the former was generated from partial melting of metabasaltic rocks leaving eclogite in the residue, whereas the latter was formed by partial melting of metabasaltic rocks leaving garnet-amphibolite in the residue. Whole-rock Nd isotopes reveal that the protoliths of Mesoarchean granitoid gneisses were derived mainly from juvenile sources, whereas the early Neoarchean granitoid gneisses were derived from juvenile sources with significant additions of crustal material and the late Neoarchean granitoid gneisses were mainly derived from continental crustal sources. These features indicate that the protoliths of the Jiaodong granitoid gneisses were possibly formed by partial melting of thickened lower crust related to underplating of mafic magmas. Mafic granulites (~2.50 Ga) of the Yishui Terrane show three distinct mineral assemblages corresponding to the pre-peak, peak and post-peak metamorphic stages, with P-T conditions constrained at 660-730℃/<6.6 kbar, 800-820℃ /8.0-8.5 kbar and 686-710℃/7.6-8.6 kbar, respectively, by using THERMOCALC pseudosection modeling. The results define an anticlockwise P-T path involving near-isobaric cooling following the peak metamorphism, suggesting that the ~2.50 Ga metamorphism was most likely related to the intrusion and underplating of mantle-derived magmas. Collectively, the results of this study suggest that the underplating of mantle-derived magmas was most likely related to a mantle plume, which is favored to account for the significant Neoarchean crustal growth and the large-scale metamorphism at the end of Neoarchean in Shandong Province as well as the whole Eastern Block in the North China Craton.
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Earth Sciences
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Boice, Anand Erik. "Sulfur isotopic evidence of microbial activity during deposition of a Neoarchean shale and in modern deep groundwater, Witwatersrand Basin, South Africa." [Bloomington, Ind.] : Indiana University, 2004. http://wwwlib.umi.com/dissertations/fullcit/3162226.

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Thesis (Ph.D.)--Indiana University, Dept. of Geological Sciences, 2004.
Title from PDF t.p. (viewed Dec. 1, 2008). Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0161. Chair: Lisa M. Pratt.

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Books on the topic "Neoarchean"

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Wu, Meiling. Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45343-8.

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Book chapters on the topic "Neoarchean"

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Halla, Jaana. "Recycling of Lead at Neoarchean Continental Margins." In Modern Approaches in Solid Earth Sciences, 195–213. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7615-9_8.

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Wu, Meiling. "Petrogenesis of Neoarchean Basement in Shandong Province." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 109–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_6.

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Wu, Meiling. "Metamorphism of Neoarchean Basement in Shandong Province." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 145–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_7.

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van der Velden, Arie J., Frederick A. Cook, Barry J. Drummond, and Bruce R. Goleby. "Reflections of the Neoarchean: A global perspective." In Archean Geodynamics and Environments, 255–65. Washington, D. C.: American Geophysical Union, 2006. http://dx.doi.org/10.1029/164gm16.

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Wu, Meiling. "Introduction." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 1–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_1.

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Wu, Meiling. "Geological Background." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 21–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_2.

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Wu, Meiling. "Tectonic Affinity and Reworking of the Jiaodong Terrane." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 37–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_3.

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Wu, Meiling. "Zircon U–Pb Geochronology and Hf Isotopes of Major Lithologies from the Jiaodong Terrane." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 49–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_4.

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Wu, Meiling. "Zircon U–Pb Geochronology and Hf Isotopes of Major Lithologies from the Yishui Terrane." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 79–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_5.

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Wu, Meiling. "Discussion and Tectonic Implications." In Ages, Geochemistry and Metamorphism of Neoarchean Basement in Shandong Province, 169–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45343-8_8.

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Conference papers on the topic "Neoarchean"

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Mathieu, Lucie, Baptiste Madon, Alexandre Crépon, Patrick Berthoty, and Daniel Kontak. "Magmatic Evolution of a Neoarchean Greenstone Belt." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1742.

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Crowe, Sean A., and Katharine J. Thompson. "PHOTOFERROTROPHY, CONTINENTAL GROWTH, AND THE HAZY NEOARCHEAN ATMOSPHERE." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-308387.

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Babechuk, Michael, Eva Stüeken, Carolina Rosca, Gabriel Sindol, and Ronny Schoenberg. "Weathering and Post-Depositional Evolution of a Neoarchean Paleosol." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.102.

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Tinker, J. H., and M. J. de Wit. "Seismic Stratigraphy of Neoarchean-Paleoproterozoic Cover of the Kaapvaal Craton." In 7th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.143.19.3.

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Siciliano, Eric, Vincent Busigny, Stefan V. Lalonde, Camille Rossignol, Francesco Narduzzi, Livia Teixeira, Adriana Zapparoli, Marly Babinski, and Pascal Philippot. "Microbial Activity Recorded in Neoarchean Iron Formations from Carajás (Brazil)." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2379.

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Chen, Mimi, Katsuhiko Suzuki, and Junko Kikuchi. "Tungsten Isotopic Constraints on Heterogeneity of the NeoArchean Earth Mantle." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.391.

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Bridges, Jae, Keneni Godana, Kevin Mahan, and Cailey Condit. "A PETROCHRONOLOGICAL COMPARISON OF NEOARCHEAN-PALEOPROTEROZOIC MONAZITE FROM SW MONTANA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-353459.

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Vincent, Stephanie A., Carol D. Frost, Susan M. Swapp, and B. Ronald Frost. "NEOARCHEAN POLYMETAMORPHISM DURING CRUSTAL ASSEMBLY OF THE SOUTHERN WYOMING PROVINCE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284201.

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McLaughlin, J. Fred, B. Ronald Frost, Carol D. Frost, Michael Meredith, and Susan M. Swapp. "TRANSPRESSIONAL TECTONICS DURING NEOARCHEAN ASSEMBLY OF THE SOUTHERN WYOMING PROVINCE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283092.

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Wilmeth, Dylan T., Frank A. Corsetti, William M. Berelson, Nicolas J. Beukes, Stanley M. Awramik, Victoria A. Petryshyn, John R. Spear, and Aaron J. Celestian. "EVIDENCE FOR RAPID RATES OF OXYGENIC PHOTOSYNTHESIS WITHIN NEOARCHEAN STROMATOLITES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-318717.

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Reports on the topic "Neoarchean"

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van Breemen, O., K. B. Heather, and J. A. Ayer. U-Pb geochronology of the Neoarchean Swayze sector of the southern Abitibi greenstone belt. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2006. http://dx.doi.org/10.4095/223016.

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Sanborn, N., R. Stern, S. Desgreniers, and G. A. Botton. Microstructure of Neoarchean zircon from the Acasta gneiss complex, Northwest Territories; Radiogenic age and isotopic studies: Report 13. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211627.

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Chapman, J. B., J. M. Peter, and D. Layton-Matthews. Geochemistry database for carbonaceous and sulphidic metasediment horizons of the western Neoarchean Kidd-Munro Assemblage, Abitibi Subprovince, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/287266.

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Tschirhart, P. A., W. A. Morris, and C. A. Jefferson. Geophysical modelling of the Neoarchean Woodburn Lake and Paleoproterozoic Ketyet River groups, and plutonic rocks in central Schultz Lake map area, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292116.

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Rainbird, R. H., W. J. Davis, L. B. Aspler, J. R. Chiarenzelli, and J. J. Ryan. SHRIMP U-Pb detrital zircon geochronology of enigmatic Neoarchean-Paleoproterozoic sedimentary rocks of the central western Churchill Province, Nunavut; Radiogenic Age and Isotopic Studies: Report 15. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213621.

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