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Artigos de revistas sobre o tema "Geology, Stratigraphic Proterozoic"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 30 de janeiro de 2023

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1

Phillips, Bruce J., Alan W. James, and Graeme M. Philip. "THE GEOLOGY AND HYDROCARBON POTENTIAL OF THE NORTH-WESTERN OFFICER BASIN." APPEA Journal 25, no. 1 (1985): 52. http://dx.doi.org/10.1071/aj84004.

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Recent petroleum exploration in EP 186 and EP 187 in the north-western Officer Basin has greatly increased knowledge of the regional stratigraphy, structure and petroleum prospectivity of the region. This exploration programme has involved the drilling of two deep stratigraphic wells (Dragoon 1 and Hussar 1) and the acquisition of 1438 km of seismic data. Integration of regional gravity and aeromagnetic data with regional seismic and well data reveals that the Gibson Sub-basin primarily contains a Proterozoic evaporitic sequence. In contrast, the Herbert Sub-basin contains a Late Proterozoic t

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2

Martins-Neto, Marcelo A. "Sequence stratigraphic framework of Proterozoic successions in eastern Brazil." Marine and Petroleum Geology 26, no. 2 (February 2009): 163–76. http://dx.doi.org/10.1016/j.marpetgeo.2007.10.001.

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Cosgrove, G. I. E., L. Colombera, and N. P. Mountney. "Eolian stratigraphic record of environmental change through geological time." Geology 50, no. 3 (November 22, 2021): 289–94. http://dx.doi.org/10.1130/g49474.1.

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Abstract The terrestrial sedimentary record provides a valuable archive of how ancient depositional systems responded to and recorded changes in Earth's atmosphere, biosphere, and geosphere. However, the record of these environmental changes in eolian sedimentary successions is poorly constrained and largely unquantified. Our study presents the first global-scale, quantitative investigation of the architecture of eolian systems through geological time via analysis of 55 case studies of eolian successions. Eolian deposits accumulating (1) under greenhouse conditions, (2) in the presence of vasc

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Alsop, G. I. "The geometry and structural evolution of a crustal-scale Caledonian fold complex: the Ballybofey Nappe, northwest Ireland." Geological Magazine 131, no. 4 (July 1994): 519–37. http://dx.doi.org/10.1017/s0016756800012139.

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AbstractThe gross geometries exhibited by crustal-scale fold nappes are considered a consequence of both original stratigraphic relationships associated with sub-basin configuration, coupled with the nature of the structural regime and tectonic processes involved in the generation of the nappe pile. The Neo-Proterozoic Dalradian metasediments of northwestern Ireland provide a well-constrained and correlatable stratigraphy which defines a sequence of sub-reclined, tight-isoclinal Caledonian (c. 460 Ma) fold nappes. Within this fold complex, the dominant structure is the crustal-scale Ballybofey

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GEHLING, JAMES G., SÖREN JENSEN, MARY L. DROSER, PAUL M. MYROW, and GUY M. NARBONNE. "Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland." Geological Magazine 138, no. 2 (March 2001): 213–18. http://dx.doi.org/10.1017/s001675680100509x.

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The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone, extends some 4 m below the Global Standard Stratotype-section and Point for the base of the Cambrian Period at Fortune Head on the Burin Peninsula in southeastern Newfoundland. The identification of zigzag traces of Treptichnus isp., even further below the GSSP than T. pedum in the Fortune Head section, and in other terminal Proterozoic successions around the globe, supports the concept of a gradational onset of three-dimensional burrowing across the Proterozoic–Cambrian boundary. Although T. pedum remains a

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GEYER, G. "The Fish River Subgroup in Namibia: stratigraphy, depositional environments and the Proterozoic–Cambrian boundary problem revisited." Geological Magazine 142, no. 5 (September 2005): 465–98. http://dx.doi.org/10.1017/s0016756805000956.

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The Fish River Subgroup of the Nama Group, southern Namibia, is restudied in terms of lithostratigraphy and depositional environment. The study is based on partly fine-scaled sections, particularly of the Nababis and Gross Aub Formation. The results are generally in accordance with earlier studies. However, braided river deposits appear to be less widely distributed in the studied area, and a considerable part of the formations of the middle and upper subgroup apparently were deposited under shallowest marine conditions including upper shore-face. Evidence comes partly from sedimentary feature

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Kulikov, V. S., V. V. Kulikova, and A. K. Polin. "NEW CHRONOSTRATIC SCHEME OF SOUTH-EASTERN FENNOSCANDIA AND ITS USE IN THE PREPARATION OF SMALL-SCALE GEOLOGICAL MAPS OF THE PRECAMBRIAN REGIONS." Proceedings of higher educational establishments. Geology and Exploration, no. 5 (October 28, 2017): 5–12. http://dx.doi.org/10.32454/0016-7762-2017-5-5-12.

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A new chronostratic scheme of South-East (SE) Fennoscandia has been developed, based on the International Stratigraphie Scale, taking into account some elements of the Common Stratigraphic Scale of Russia and the regional stratigraphic scheme of the North-West (NW) of Russian Federation. A rank of Archean and Proterozoic stratons has been determined (including supersystems for Riphean and Archean geonotems), compatable in dutation to the Phanerozoic systems (Mesozoic and Paleozoic ones). An original coloring for the geological maps of the newly allocated systems and their analogues in the Prec

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Jackson, J., I. P. Sweet, and T. G. Powell. "STUDIES ON PETROLEUM GEOLOGY AND GEOCHEMISTRY, MIDDLE PROTEROZOIC, McARTHUR BASIN NORTHERN AUSTRALIA I: PETROLEUM POTENTIAL." APPEA Journal 28, no. 1 (1988): 283. http://dx.doi.org/10.1071/aj87022.

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Mature, rich, potential source beds and adjacent potential reservoir beds exist in the Middle Proterozoic sequence (1400-1800 Ma) of the McArthur Basin. The McArthur and Nathan Groups consist mainly of evaporitic and stromatolitic cherty dolostones interbedded with dolomitic siltstone and shale. They were deposited in interfingering marginal marine, lacustrine and fluvial environments. Lacustrine dolomitic siltstones form potential source beds, while potential reservoirs include vuggy brecciated carbonates associated with penecontemporaneous faulting and rare coarse-grained clastics. In contra

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HARLAND, W. BRIAN. "Origins and assessment of snowball Earth hypotheses." Geological Magazine 144, no. 4 (June 6, 2007): 633–42. http://dx.doi.org/10.1017/s0016756807003391.

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Brian Harland was for many years an editor of this journal. He was also a seminal figure in the origins of the current ‘snowball Earth’ debate, having recognized in 1964 the significance of coupling emerging palaeomagnetic data on palaeolatitude with his interpretations of diamictites. Harland worked extensively in the Arctic and knew well many of the workers involved in the arguments surrounding the origin of diamictites. He thus had a unique perspective on the evidence and the disputes surrounding it. This was his last paper but he was not able to complete it before he died. However, with th

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10

Green, J. W., A. H. Knoll, and K. Swett. "Microfossils from silicified stromatolitic carbonates of the Upper Proterozoic Limestone-Dolomite 'Series', central East Greenland." Geological Magazine 126, no. 5 (September 1, 1989): 567–85. http://dx.doi.org/10.1017/s0016756800022858.

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AbstractSilicified flake conglomerates andin situstratiform stromatolites of the Upper Proterozoic (c.700–800 Ma) Limestone-Dolomite ‘Series’, central East Greenland, contain well preserved microfossils. Five stratigraphic horizons within the 1200 m succession contain microbial mat assemblages, providing a broad palaeontological representation of late Proterozoic peritidal mat communities. Comparison of assemblages demonstrates that the taxonomy and diversity of mat builder, dweller, and allochthonous populations all vary considerably within and among horizons. The primary mat builder in most

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Myrow, P. M., N. C. Hughes, and N. R. McKenzie. "Reconstructing the Himalayan margin prior to collision with Asia: Proterozoic and lower Paleozoic geology and its implications for Cenozoic tectonics." Geological Society, London, Special Publications 483, no. 1 (November 21, 2018): 39–64. http://dx.doi.org/10.1144/sp483.10.

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AbstractReconstructing the stratigraphic architecture of deposits prior to Cenozoic Himalayan uplift is critical for unravelling the structural, metamorphic, depositional and erosional history of the orogen. The nature and distribution of Proterozoic and lower Paleozoic strata have helped elucidate the relationship between lithotectonic zones, as well as the geometries of major bounding faults. Stratigraphic and geochronological work has revealed a uniform and widespread pattern of Paleoproterozoic strata >1.6 Ga that are unconformably overlain by <1.1 Ga rocks. The overlying Neoproteroz

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Nagovitsin, K. E., A. M. Stanevich, and T. A. Kornilova. "Stratigraphic setting and age of the complex Tappania-bearing Proterozoic fossil biota of Siberia." Russian Geology and Geophysics 51, no. 11 (November 2010): 1192–98. http://dx.doi.org/10.1016/j.rgg.2010.10.004.

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SAYLOR, BEVERLY Z., JANICE M. POLING, and WARREN D. HUFF. "Stratigraphic and chemical correlation of volcanic ash beds in the terminal Proterozoic Nama Group, Namibia." Geological Magazine 142, no. 5 (September 2005): 519–38. http://dx.doi.org/10.1017/s0016756805000932.

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At least twenty silicified volcanic ash beds have been identified in the Kuibis and Schwarzrand subgroups of the terminal Proterozoic Nama Group of Namibia. Nineteen of the Nama ash beds are in the Schwarzrand Subgroup in the Witputs subbasin. Two of these are in the siliciclastic-dominated lower part of the subgroup, which consists of the Nudaus Formation and Nasep Member of the Urusis Formation and comprises two depositional sequences. Identification and correlation of these ash beds are very well known based on stratigraphic position. Sixteen ash beds are contained within the carbonate-domi

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14

Evans, James E., Joshua T. Maurer, and Christopher S. Holm-Denoma. "Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and transgressive systems tracts." Geosphere 15, no. 5 (August 9, 2019): 1479–507. http://dx.doi.org/10.1130/ges02085.1.

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Abstract The Upper Devonian Ignacio Formation (as stratigraphically revised) comprises a transgressive, tide-dominated estuarine depositional system in the San Juan Mountains (Colorado, USA). The unit backfills at least three bedrock paleovalleys (10–30 km wide and ≥42 m deep) with a consistent stratigraphy of tidally influenced fluvial, bayhead-delta, central estuarine-basin, mixed tidal-flat, and estuarine-mouth tidal sandbar deposits. Paleovalleys were oriented northwest while longshore transport was to the north. The deposits represent Upper Devonian lowstand and transgressive systems trac

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15

Gubin, Igor A., and Vladimir A. Kontorovich. "Seismogeological structure model of the Anabar-Olenek region." Georesursy 23, no. 1 (March 30, 2021): 70–77. http://dx.doi.org/10.18599/grs.2021.1.7.

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The velocity characteristics of the Upper Proterozoic-Phanerozoic sedimentary cover of the Anabar-Olenek region were studied, in particular, the bimodal character of the distribution interval P-wave velocities was established. Taking into account modern ideas about the chronostratigraphy of sediments encountered by the Charchykskaya-1, Burskaya-3410 and Khastakhskaya-930 deep boreholes, stratification of reflecting horizons was carried out and time sections from previous years were reinterpreted. From the perspective of seismic stratigraphic and seismic facies analysis, the Cambrian, Vendian,

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16

Singh, Rajinder Kumar, Surendra Kumar, and Ratikant Sikdar. "Geology and Mineral Potential of Copper-Silver mineralization in Kulu district of Himachal Pradesh, India." Journal of Geoscience, Engineering, Environment, and Technology 4, no. 2-2 (July 25, 2019): 39. http://dx.doi.org/10.25299/jgeet.2019.4.2-2.2127.

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Naraul Formation of the Larji Group in Kulu district of Himachal Pradesh contains the major strata bound Copper mineralization at many places as observed through old working near Naraul, Danala and Kanda in Sainj Valley of Kulu district exposing the Proterozoic Northwestern Himalayan belt. The same structural belt is also known for Silver mineralisation around Manikaran. At Naraul, a regional stratigraphic and mineralogical framework of the Naraul Formation for mineralogical resource assessment was viewed. The old workings within 4-5 km long and 200-300m wide along the NW- SE trending structur

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17

Liu, Deng, and Dai Yong Cao. "Regional Geology Background and Minerogenetic Series in Ongniud Banner of Inner Mongolia." Advanced Materials Research 734-737 (August 2013): 408–17. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.408.

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Ongniud Banner is located in the northern margin of the North China platform, possessing binary attribute of the greenville period orogenic belt and North China block. The authors reclassify geological unit through the rock stratigraphic correlation and isotope chronology. Achaean strata is mainly composed of quartz schist, chlorite schist, amphibole schist, and the rocks have been highly metamorphosed into the green schist facies, and its single particle zircon U-Pb age is 2645 ±86Ma, so it is assigned to North China block. Proterozoic strata is mainly composed of metamorphic complex includin

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Jinbiao, Chen. "An explanatory note on proterozoic stratigraphic nomenclature used in the People's Republic of China." Precambrian Research 29, no. 1-3 (June 1985): 3–4. http://dx.doi.org/10.1016/0301-9268(85)90054-3.

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Alvan, Aldo A., Yacory F. Bustamante, Elvis A. Sánchez, and Mirian I. Mamani. "Arquitectura estratigráfica, paleogeografía y proveniencia sedimentaria de las rocas cenozoicas del sur de Perú (Tacna, 18° S)." Andean Geology 47, no. 2 (May 29, 2020): 351. http://dx.doi.org/10.5027/andgeov47n2-3168.

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The Cenozoic rocks lying in the Province of Tacna (18° S), southern Perú, represent approximately 600 m of stratigraphic thickness. This stacking groups the Sotillo (Paleocene), Moquegua Inferior (Eocene), Moquegua Superior (Oligocene), Huaylillas (Miocene) and Millo formations (Pliocene), and these are the sedimentary fill of the Moquegua Basin. The sediments of the three latter formations are organized into nine sedimentary facies and five architectural elements. Their facies associations suggest the existence of an ancient highly channelized multi-lateral fluvial braided system, with upward

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Clarke, G. L., J. P. Burg, and C. J. L. Wilson. "Stratigraphic and structural constraints on the proterozoic tectonic history of the Olary Block, South Australia." Precambrian Research 34, no. 2 (December 1986): 107–37. http://dx.doi.org/10.1016/0301-9268(86)90053-7.

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Chandler, Val W., and Kelley Carlson Malek. "Moving‐window Poisson analysis of gravity and magnetic data from the Penokean orogen, east‐central Minnesota." GEOPHYSICS 56, no. 1 (January 1991): 123–32. http://dx.doi.org/10.1190/1.1442948.

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Analytical correlation of gravity and magnetic data through moving‐window application of Poisson's theorem is useful in studying the complex Precambrian geology of central Minnesota. Linear regression between the two data sets at each window position yields correlation, intercept, and slope parameters that quantitatively describe the relationship between the gravity and magnetic data and, in the case of the slope parameter, are often accurate estimates of magnetizatons‐to‐density ratios (MDR) of anomalous sources. In this study, gridded gravity and magnetic data from a 217.6 × 217.6 km area in

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Delpomdor, Franck R. A., Xavier Devleeschouwer, Simo Spassov, and Alain R. Préat. "Stratigraphic correlations in mid- to late-Proterozoic carbonates of the Democratic Republic of Congo using magnetic susceptibility." Sedimentary Geology 351 (April 2017): 80–101. http://dx.doi.org/10.1016/j.sedgeo.2017.02.007.

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Neogi, Susobhan, Apoorve Bhardwaj, and Amitava Kundu. "Evolution of Neoproterozoic Shillong Basin, Meghalaya, NE India: implications of supercontinent break-up and amalgamation." Geological Magazine 159, no. 4 (December 9, 2021): 628–44. http://dx.doi.org/10.1017/s0016756821001230.

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AbstractFragmentation and amalgamation of supercontinents play an important role in shaping our planet. The break-up of such a widely studied supercontinent, Rodinia, has been well documented from several parts of India, especially the northwestern and eastern sector. Interestingly, being located very close to the Proterozoic tectonic margin, northeastern India is expected to have had a significant role in Neoproterozoic geodynamics, but this aspect has still not been thoroughly studied. We therefore investigate a poorly studied NE–SW-trending Shillong Basin of Meghalaya from NE India, which p

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Lindsay, Mark D., Sandra Occhipinti, Crystal Laflamme, Alan Aitken, and Lara Ramos. "Mapping undercover: integrated geoscientific interpretation and 3D modelling of a Proterozoic basin." Solid Earth 11, no. 3 (June 24, 2020): 1053–77. http://dx.doi.org/10.5194/se-11-1053-2020.

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Abstract. Gravity and 3D modelling combined with geochemical analysis examine the subsurface within and below the poorly exposed Palaeoproterozoic Yerrida Basin in central Western Australia. Understanding the structure of a region is important as key features indicating past geodynamic processes and tectonic activity can be revealed. However, in stable, post-depositional tectonic settings only the younger sedimentary units tend to be widely exposed, rendering direct observation of basement and intrusive rocks impossible. Geophysical imaging and modelling can reveal the structure of a region un

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Kuznetsov, A. B., M. A. Semikhatov, and I. M. Gorokhov. "The Sr isotope chemostratigraphy as a tool for solving stratigraphic problems of the Upper Proterozoic (Riphean and Vendian)." Stratigraphy and Geological Correlation 22, no. 6 (November 2014): 553–75. http://dx.doi.org/10.1134/s0869593814060033.

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Li, Shuang-Qing, Song He, and Fukun Chen. "Provenance changes across the mid-Cretaceous unconformity in basins of northeastern China: Evidence for an integrated paleolake system and tectonic transformation." GSA Bulletin 133, no. 1-2 (June 1, 2020): 185–98. http://dx.doi.org/10.1130/b35660.1.

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Abstract Detrital zircon U-Pb dating and whole-rock Nd isotopic analyses were carried out on selected stratigraphic horizons across a major unconformity between synrift and postrift stages in the Songliao Basin and Dasanjiang basin group of NE China to constrain the crustal evolution of the source area providing detritus into these basins. The strata underlying the mid-Cretaceous unconformity in the Songliao Basin show regionally distinct detrital zircon age populations and Nd isotopic compositions, which generally are characterized by Phanerozoic age peaks and relatively depleted Nd isotopic

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Young, Grant M. "Stratigraphic and tectonic settings of Proterozoic glaciogenic rocks and banded iron-formations: relevance to the snowball Earth debate." Journal of African Earth Sciences 35, no. 4 (November 2002): 451–66. http://dx.doi.org/10.1016/s0899-5362(02)00158-6.

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Al-Hadidy, Aboosh H. "Paleozoic stratigraphic lexicon and hydrocarbon habitat of Iraq." GeoArabia 12, no. 1 (January 1, 2007): 63–130. http://dx.doi.org/10.2113/geoarabia120163.

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ABSTRACT The crystalline Proterozoic Basement does not crop out in Iraq, but is interpreted from seismic and geophysical potential data to range in depth from about 6–10 km in western Iraq, to 12–15 km in the Zagros Mountains, in eastern Iraq. The Cambrian and Lower Ordovician sedimentary successions of Jordan and Saudi Arabia (including the Middle Cambrian Burj carbonates) are interpreted to extend into Iraq based on seismic data and regional correlations. The entire Paleozoic succssion is about 3–4 km thick. The Ordovician-Permian succession in Iraq consists of ten formations that are here d

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Farooqui, Mohammed Y., Khamis Farhoud, Dia Mahmoud, and Ahmed N. El-Barkooky. "Petroleum potential of the interpreted Paleozoic geoseismic sequences in the South Diyur Block, Western Desert of Egypt." GeoArabia 17, no. 3 (July 1, 2012): 133–76. http://dx.doi.org/10.2113/geoarabia1703133.

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ABSTRACT The South Diyur exploration block of nearly 38,000 sq km is located in the Farafra Oasis region in the Western Desert of Egypt. It is a frontier exploration area, the nearest well being Ammonite-1, a dry hole drilled by Conoco in 1979 immediately outside the southwestern corner of the block. The South Diyur Block is located on the probable northeast extension of the Kufra Basin in southeast Libya. Although prolific reserves of oil and gas occur in Paleozoic basins in North Africa and throughout the Middle East, to date, the targets for petroleum exploration in the northern Western Des

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GROTZINGER, J., E. W. ADAMS, and S. SCHRÖDER. "Microbial–metazoan reefs of the terminal Proterozoic Nama Group (c. 550–543 Ma), Namibia." Geological Magazine 142, no. 5 (September 2005): 499–517. http://dx.doi.org/10.1017/s0016756805000907.

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Thrombolite and stromatolite reefs occur at several stratigraphic levels within the terminal Proterozoic Nama Group (c. 550–543 Ma) of central and southern Namibia. The reefs form integral parts of several carbonate platforms within the Nama Group, including the Kuibis platform of the northern Nama Basin (Zaris subbasin), and Huns platform (Witputs subbasin) of the southern Nama Basin. The reefs are composed of both thrombolites and stromatolites that form laterally continuous biostromes, isolated patch reefs, and isolated pinnacle reefs ranging in scale from a metre to several kilometres in w

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Schieber, Juergen. "Stratigraphic control of rare-earth pattern types in Mid-Proterozoic sediments of the Belt Supergroup, Montana, U.S.A.: Implications for basin analysis." Chemical Geology 54, no. 1-2 (January 1986): 135–48. http://dx.doi.org/10.1016/0009-2541(86)90077-x.

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JACKSON, M. J., E. L. SIMPSON, and K. A. ERIKSSON. "Facies and sequence stratigraphic analysis in an intracratonic, thermal-relaxation basin: the Early Proterozoic, Lower Quilalar Formation and Ballara Quartzite, Mount Isa Inlier, Australia." Sedimentology 37, no. 6 (December 1990): 1053–78. http://dx.doi.org/10.1111/j.1365-3091.1990.tb01846.x.

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Kaufman, Alan J., J. M. Hayes, Andrew H. Knoll, and Gerard J. B. Germs. "Isotopic compositions of carbonates and organic carbon from upper Proterozoic successions in Namibia: stratigraphic variation and the effects of diagenesis and metamorphism." Precambrian Research 49, no. 3-4 (February 1991): 301–27. http://dx.doi.org/10.1016/0301-9268(91)90039-d.

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Al-Husseini, Moujahed I. "MIDDLE EAST GEOLOGIC TIME SCALE 2010: Early Cambrian Asfar Sequence." GeoArabia 15, no. 1 (January 1, 2010): 137–60. http://dx.doi.org/10.2113/geoarabia1501137.

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ABSTRACT This paper is the first in a series dedicated to the Phanerozoic Cambrian Period, and Neoproterozoic Ediacaran and Cryogenian periods, as represented in the Middle East Geologic Time Scale (ME GTS, see enclosed Chart). It introduces the term Asfar Sequence to represent a regional Early Cambrian time-rock unit, consisting mainly of continental quartz-rich arkosic sandstone, shale and siltstone, which attain a thickness of at least 750 m in Jordan and more than 700 m in Oman. The term “Asfar”, meaning yellow in Arabic, was chosen because it is the standard color for sandstone in ME GTS.

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Harland, W. Brian, and Nicholas J. Butterfield. "Chapter 12 Pre-Vendian history." Geological Society, London, Memoirs 17, no. 1 (1997): 227–43. http://dx.doi.org/10.1144/gsl.mem.1997.017.01.12.

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It so happens that rocks of Vendian age are extensive and are well exposed in Svalbard. This applies especially to early Vendian, i.e. Varanger, with two distinctive glacial horizons as are treated in the Chapter 13. The Early Varanger (Smalfjord) episode can be correlated in most sections and so provides a reference horizon which serves approximately to identify pre-Varanger rocks. The pre-Vendian rocks have yet to show such good correlation characters. Therefore in Svalbard it is convenient to consider pre-Vendian successions together. Their distribution is shown in the map (Fig. 12.1).Some

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Gibson, Timothy M., Sarah Wörndle, Peter W. Crockford, T. Hao Bui, Robert A. Creaser, and Galen P. Halverson. "Radiogenic isotope chemostratigraphy reveals marine and nonmarine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada." GSA Bulletin 131, no. 11-12 (April 24, 2019): 1965–78. http://dx.doi.org/10.1130/b35060.1.

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Abstract The ca. 1050 Ma Bylot Supergroup in Arctic Canada is one of the best-preserved archives of late Mesoproterozoic geochemistry and biology and offers evidence that this period of Earth history may have been more biogeochemically dynamic than previously appreciated. The Bylot Supergroup was deposited in the Borden Basin and is the most thoroughly studied stratigraphic succession from a series of broadly contemporaneous late Mesoproterozoic intracratonic basins known as the Bylot basins. This ∼6-km-thick mixed carbonate-siliciclastic succession has undergone minimal postdepositional defor

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Sahoo, Janmejaya, Prabodha Ranjan Sahoo, Israil Khan, and Akella Satya Venkatesh. "Insights into the Metallogenesis of the Felsic Volcanic Hosted Mundiyawas-Khera Cu Deposit, Alwar Basin, Western India." Minerals 12, no. 3 (March 17, 2022): 370. http://dx.doi.org/10.3390/min12030370.

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Copper and associated gold mineralization in the Mundiyawas-Khera area of western India is hosted by the Proterozoic felsic volcanic rocks of rhyo-dacite composition. Signatures of hydrothermal alteration represented by sericite, epidote, scapolite and carbonates are well observed around the ore mineralization zone. The felsic volcanic rocks with gently to flat sloping REE pattern, variable negative Eu anomaly, intermediate abundances of HFSE and moderate to low Zr/Y anomalies are suggested to be FII, FIIIa and FIV type rhyolite. The felsic volcanic host rock for copper mineralization has a de

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Semikhatov, M. A., A. B. Kuznetsov, and N. M. Chumakov. "Isotope age of boundaries between the general stratigraphic subdivisions of the Upper Proterozoic (Riphean and Vendian) in Russia: The evolution of opinions and the current estimate." Stratigraphy and Geological Correlation 23, no. 6 (November 2015): 568–79. http://dx.doi.org/10.1134/s0869593815060088.

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Hughes, G. Wyn, David J. Grainger, Abdul-Jaleel Abu-Bshait, and M. Jarad Abdul-Rahman. "Lithostratigraphy and Depositional History of Part of the Midyan Region, Northwestern Saudi Arabia." GeoArabia 4, no. 4 (October 1, 1999): 503–42. http://dx.doi.org/10.2113/geoarabia0404503.

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ABSTRACT The Midyan region provides a unique opportunity in which to examine exposures of the Upper Cretaceous and Neogene sedimentary succession. Recent investigations have yielded new interpretations of its depositional environments, stratigraphic relationships, and structure. In this paper, all the lithostratigraphic units of the Midyan succession are considered to be informal in advance of an on-going process of formalization. The region is bounded to the north and northeast by mountains of Proterozoic rocks and to the west and south by the Gulf of Aqaba and the Red Sea, respectively. The

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Al-Husseini, Moujahed. "Late Ediacaran to early Cambrian (Infracambrian) Jibalah Group of Saudi Arabia." GeoArabia 16, no. 3 (July 1, 2011): 69–90. http://dx.doi.org/10.2113/geoarabia160369.

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ABSTRACT This paper is one of a series that document the Neoproterozoic – Cambrian rock units in the Middle East Geologic Time Scale. It is focused on the oldest sedimentary succession in Saudi Arabia, the late Ediacaran – early Cambrian (Infracambrian) Jibalah Group (ca. 585 to 530–520 Ma). The group crops out in disconnected, pull-apart basins (ca. 10–100 km long and up to 20 km wide) along the NW-trending, strike-slip Najd Fault System in the Arabian Shield. It was described and mapped in the 1960s to 1980s, and several formations were defined and named in two areas separated by ca. 400 km.

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Wu, Chen, Changfeng Liu, Suoya Fan, Andrew V. Zuza, Lin Ding, Wencan Liu, Baoying Ye, Shijie Yang, and Zhiguang Zhou. "Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet." GSA Bulletin 132, no. 5-6 (October 30, 2019): 1291–315. http://dx.doi.org/10.1130/b35388.1.

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Abstract The Tibetan Plateau, the largest highland on Earth, formed due to the collision of India-Asia over the past 50–60 m.y., and the evolution of the Tibetan Plateau impacts our knowledge of continental tectonics. Examination of the northernmost margin of the Tibetan Plateau is key to unravelling the deformation mechanisms acting in northern Tibet. The left-slip Altyn Tagh fault system defines the northwest margin of the Tibetan Plateau, separating the Western and Eastern Kunlun Ranges in the southwest. Both Cenozoic and pre-Cenozoic crustal deformation events at this junction between the

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Couëffé, Renaud, and Marco Vecoli. "New sedimentological and biostratigraphic data in the Kwahu Group (Meso- to Neo-Proterozoic), southern margin of the Volta Basin, Ghana: Stratigraphic constraints and implications on regional lithostratigraphic correlations." Precambrian Research 189, no. 1-2 (August 2011): 155–75. http://dx.doi.org/10.1016/j.precamres.2011.05.009.

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Higgins, A. K. "Geology of central and eastern North Greenland." Rapport Grønlands Geologiske Undersøgelse 128 (December 31, 1986): 37–54. http://dx.doi.org/10.34194/rapggu.v128.7923.

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A historical review of geological research in North Greenland is followed by a summary of the main results of the 1978-80 GGU expeditions to the region. New outcrops of Archaean and early Proterozoic crystalline rocks are recorded only as xenoliths in dykes and volcanic centres. A revised stratigraphy is applied to the middle Proterozoic Independence Fjord Group sandstones, while petrographic and isotopic studies have been made of the cross-cutting Midsommersø dolerites and the overlying Zig-Zag Dal Basalt Formation. No convincing evidence has been found of a Carolinidian orogenic episode sepa

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Zuza, Andrew V., Christopher D. Henry, Seth Dee, Charles H. Thorman, and Matthew T. Heizler. "Jurassic–Cenozoic tectonics of the Pequop Mountains, NE Nevada, in the North American Cordillera hinterland." Geosphere 17, no. 6 (October 27, 2021): 2078–122. http://dx.doi.org/10.1130/ges02307.1.

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Abstract The Ruby Mountains–East Humboldt Range–Wood Hills–Pequop Mountains (REWP) metamorphic core complex, northeast Nevada, exposes a record of Mesozoic contraction and Cenozoic extension in the hinterland of the North American Cordillera. The timing, magnitude, and style of crustal thickening and succeeding crustal thinning have long been debated. The Pequop Mountains, comprising Neoproterozoic through Triassic strata, are the least deformed part of this composite metamorphic core complex, compared to the migmatitic and mylonitized ranges to the west, and provide the clearest field relatio

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JASTRZĘBSKI, MIROSŁAW, ANDRZEJ ŻELAŹNIEWICZ, IZABELLA NOWAK, MENTOR MURTEZI, and ALEXANDER N. LARIONOV. "Protolith age and provenance of metasedimentary rocks in Variscan allochthon units: U–Pb SHRIMP zircon data from the Orlica–Śnieżnik Dome, West Sudetes." Geological Magazine 147, no. 3 (November 2, 2009): 416–33. http://dx.doi.org/10.1017/s0016756809990501.

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AbstractNew U–Pb sensitive high-mass resolution ion microprobe (SHRIMP) data from detrital zircons within the Orlica–Śnieżnik Dome provide new insights into the stratigraphic and palaeogeographic position of assumed relict Precambrian basement preserved in the Variscan collisional orogen of the West Sudetes, SW Poland. Hitherto, the Młynowiec Formation and the Stronie Formation within the Orlica–Śnieżnik Dome were assumed to represent two metavolcano-sedimentary successions of Proterozoic and early Palaeozoic age, respectively. However, when previous U–Pb data and mapping data from the Orlica–

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Henriksen, N., J. D. Friderichsen, R. A. Strachan, N. J. Soper, and A. K. Higgins. "Caledonian and pre-Caledonian geology of the region between Grandjean Fjord and Bessel Fjord (75°–76°N), North-East Greenland." Rapport Grønlands Geologiske Undersøgelse 145 (December 31, 1989): 90–97. http://dx.doi.org/10.34194/rapggu.v145.8084.

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The area between Grandjean Fjord and Bessel Fjord was the focus in 1988 of regional geological investigations and 1:500000 mapping during the North-East Greenland project (Henriksen, 1989). The greater part of the area forms part of the East Greenland Caledonides and can be divided into three distinct rock groups: infracrustal gneisses and granites of possibie Archaean or early Proterozoic origin; a metasedimentary sequence which has probably suffered both mid-Proterozoic and Caledonian migmatisation and metamorphism; and the late Proterozoic Eleonore Bay Group, a thick sedimentary sequence wh

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Jenkins, Richard J. F., David M. McKirdy, Clinton B. Foster, Teresa O'Leary, and Stephen D. Pell. "The record and stratigraphie implications of organic-walled microfossils from the Ediacaran (terminal Proterozoic) of South Australia." Geological Magazine 129, no. 4 (July 1992): 401–10. http://dx.doi.org/10.1017/s001675680001949x.

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AbstractTwo assemblages of organic-walled microfossils have been recognized in drillcore samples from the late Proterozoic Rodda Beds in theeastern Officer Basin, South Australia. The fossils include tube-like remains and large, simple and sculptured acritarchs. Lithostratigraphic studies and seismic information, in conjunction with previous (albeit limited) acritarch finds, allow local correlation of the Rodda Beds with Ediacaran or terminal Proterozoic sequences in the northern Adelaide Fold Belt (site of the nominated Ediacaran stratotype). The new palynofloras are comparable withacritarch

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HOFMANN, HANS J., and GARTH D. JACKSON. "Proterozoic ministromatolites with radial-fibrous fabric." Sedimentology 34, no. 6 (December 1987): 963–71. http://dx.doi.org/10.1111/j.1365-3091.1987.tb00586.x.

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Cole, Devon B., Brennan O'Connell, and Noah J. Planavsky. "Authigenic chromium enrichments in Proterozoic ironstones." Sedimentary Geology 372 (October 2018): 25–43. http://dx.doi.org/10.1016/j.sedgeo.2018.05.002.

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Meyers, Stephen R., and Alberto Malinverno. "Proterozoic Milankovitch cycles and the history of the solar system." Proceedings of the National Academy of Sciences 115, no. 25 (June 4, 2018): 6363–68. http://dx.doi.org/10.1073/pnas.1717689115.

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The geologic record of Milankovitch climate cycles provides a rich conceptual and temporal framework for evaluating Earth system evolution, bestowing a sharp lens through which to view our planet’s history. However, the utility of these cycles for constraining the early Earth system is hindered by seemingly insurmountable uncertainties in our knowledge of solar system behavior (including Earth–Moon history), and poor temporal control for validation of cycle periods (e.g., from radioisotopic dates). Here we address these problems using a Bayesian inversion approach to quantitatively link astron

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