Relevant bibliographies by topics / Oman ophiolite

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  2. Dissertations / Theses
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Academic literature on the topic 'Oman ophiolite'

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Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "Oman ophiolite"

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Ibragimov, Iskander, Daniel Kiss, and Evangelos Moulas. "A thermo-mechanical model of the thermal evolution and incorporation of metamorphic soles in Tethyan ophiolites: a case study from Oman." Austrian Journal of Earth Sciences 117, no. 1 (January 1, 2024): 13–24. http://dx.doi.org/10.17738/ajes.2024.0002.

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Abstract Ophiolites are remnants of oceanic crust and mantle, now typically found within continental mountain ranges like the Alps. Particularly in areas once part of the Tethys Ocean, ophiolites are often accompanied by narrow stripes of metamorphic rocks, commonly referred to as metamorphic soles. These metamorphic soles typically exhibit peak metamorphic conditions characteristic of either granulite or amphibolite facies. Geochronological studies of Tethyan ophiolites indicate that the development of these metamorphic soles occurred almost simultaneously with the crystallization of the ophiolite’s crustal sequence. Geological evidence also suggests that the metamorphism of the sole rocks took place concurrently with deformation, likely at the same time as the ophiolite’s obduction. In our research, we explore the metamorphic effects of shearing in an ophiolite sequence overlying a crustal sequence. Our findings reveal that strong lithologies like ophiolites can produce additional heat through the dissipation of mechanical energy, which can potentially explain the high temperatures found in metamorphic-sole rocks. In addition, heating-driven softening of the footwall rocks eventually leads to the migration of the active shear zone from the mantle sequence into the upper crustal domain. This migration may be responsible for the metamorphic sole incorporation at the base of the ophiolite. Finally, we demonstrate that stopping the shearing process rapidly cools these rocks, corresponding with the findings from thermochronological studies from Oman ophiolite.
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UMINO, Susumu, Shuichi YANAI, Yasuo NAKAMURA, and J. Toshimichi IIYAMA. "Semail Ophiolite in Oman." Journal of Geography (Chigaku Zasshi) 98, no. 3 (1989): plate1—plate3. http://dx.doi.org/10.5026/jgeography/98.3_plate1.

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IMMENHAUSER, ADRIAN, GUIDO SCHREURS, EDWIN GNOS, HEIKO W. OTERDOOM, and BERNHARD HARTMANN. "Late Palaeozoic to Neogene geodynamic evolution of the northeastern Oman margin." Geological Magazine 137, no. 1 (January 2000): 1–18. http://dx.doi.org/10.1017/s0016756800003526.

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When the highlands of Arabia were still covered with an ice shield in the latest Carboniferous/Early Permian period, separation of Gondwana started. This led to the creation of the Batain basin (part of the early Indian Ocean), off the northeastern margin of Oman. The rifting reactivated an Infra-Cambrian rift shoulder along the northeastern Oman margin and detritus from this high was shed into the interior Oman basin. Whereas carbonate platform deposits became widespread along the margin of the Neo-Tethys (northern rim of Oman), drifting and oceanization of the Batain basin started only in Late Jurassic/Early Cretaceous time. Extensional tectonics was followed in the Late Cretaceous by contraction caused by the northward drift of Greater India and Afro-Arabia. This resulted in the collision of Afro-Arabia with an intra-oceanic trench and obduction of the Semail ophiolite and the Hawasina nappes south to southwestward onto the northern Oman margin ∼80 m.y. ago. During the middle Cretaceous, the oceanic lithosphere (including the future eastern ophiolites of Oman) drifted northwards as part of the Indian plate. At the Cretaceous–Palaeogene transition (∼65 Ma), oblique convergence between Greater India and Afro-Arabia caused fragments of the early Indian Ocean to be thrust onto the Batain basin. Subsequently, the Lower Permian to uppermost Maastrichtian sediments and volcanic rocks of the Batain basin, along with fragments of Indian Ocean floor (eastern ophiolites), were obducted northwestward onto the northeastern margin of Oman. Palaeogene neo-autochtonous sedimentary rocks subsequently covered the nappe pile. Tertiary extensional tectonics related to Red Sea rifting in the Late Eocene was followed by Miocene shortening, associated with the collision of Arabia and Eurasia and the formation of the Oman Mountains.
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Olsson, J., S. L. S. Stipp, and S. R. Gislason. "Element scavenging by recently formed travertine deposits in the alkaline springs from the Oman Semail Ophiolite." Mineralogical Magazine 78, no. 6 (November 2014): 1479–90. http://dx.doi.org/10.1180/minmag.2014.078.6.15.

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Ultramafic rocks, such as the Semail Ophiolite in the Sultanate of Oman, are considered to be a potential storage site for CO2. This type of rock is rich in divalent cations that can react with dissolved CO2 and form carbonate minerals, which remain stable over geological periods of time. Dissolution of the ophiolite mobilizes heavy metals, which can threaten the safety of surface and groundwater supplies but secondary phases, such as iron oxides, clays and carbonate minerals, can take up significant quantities of trace elements both in their structure and adsorbed on their surfaces.Hyperalkaline spring waters issuing from the Semail Ophiolites can have pH as high as 12. This water absorbs CO2 from air, forming carbonate mineral precipitates either as thin crusts on the surface of placid water pools or bottom precipitates in turbulent waters. We investigated the composition of the spring water and the precipitates to determine the extent of trace element uptake. We collected water and travertine samples from two alkaline springs of the Semail Ophiolite. Twenty seven elements were detected in the spring waters. The bulk of the precipitate was CaCO3 in aragonite, as needles, and rhombohedral calcite crystals. Traces of dypingite (Mg5(CO3)4(OH)2·5H2O) and antigorite ((Mg,Fe)3Si2O5(OH)4) were also detected. The bulk precipitate contained rare earth elements and toxic metals, such as As, Ba, Cd, Sr and Pb, which indicated scavenging by the carbonate minerals. Boron and mercury were detected in the spring water but not in the carbonate phases. The results provide confidence that many of the toxic metals released by ophiolite dissolution in an engineered CO2 injection project would be taken up by secondary phases, minimizing risk to water quality.
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Abbou-Kebir, Khadidja, Shoji Arai, Ahmed Hassan Ahmed, and Georges Ceuleneer. "Spinel-free and spinel-poor dunite veins crosscutting the Wadi Rajmi ophiolite chromitite (northern Oman ophiolite)." Bulletin de la Société Géologique de France 184, no. 3 (March 1, 2013): 261–66. http://dx.doi.org/10.2113/gssgfbull.184.3.261.

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Abstract Peculiar dunitic veins almost or totally free of spinels crosscut a podiform chromitite ore body in the Wadi Rajmi, northern Oman ophiolite. They probably originated from a komatiitic melt which was oversaturated in Fo≤94 olivines and which evolved to precipitate simultaneously both chromian spinels, with Cr# ranging from 0.6 to 0.8, and Fo91-93 olivines. The absence or the low modal amounts of spinels are possibly governed by a Cr-undersaturation state of the involved melt which crystallized under relatively low cooling rates to generate the spinel-free and the spinel-poor dunites. A shallow and highly depleted mantle source for this komatiitic melt was envisaged during a converging tectonic regime, initiated earlier in the dynamic history of the Oman ophiolite.
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Scharf, A., F. Mattern, M. Al-Wardi, G. Frijia, D. Moraetis, B. Pracejus, W. Bauer, and I. Callegari. "About this title - The Geology and Tectonics of the Jabal Akhdar and Saih Hatat Domes, Oman Mountains." Geological Society, London, Memoirs 54, no. 1 (2021): NP. http://dx.doi.org/10.1144/m54.

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The geology of the Oman Mountains, including the Jabal Akhdar and Saih Hatat domes, is extraordinarily well-exposed and diverse, spanning a geological record of more than 800 Ma. The area is blessed with first-class outcrops and is well known in the geological community for its ophiolite. The Oman Mountains have much more to offer; including, Neoproterozoic diamictites (“Snowball Earth”), fossil-rich Permo-Mesozoic carbonates and metamorphic rocks. The arid climate and deep incision of wadis allow for nearly complete rock exposure which can be investigated in all three dimensions. The diverse geology is also responsible for the breathtaking landscape. New roads and the nature of the friendly Omani people make fieldwork unforgettable.This Memoir provides a thorough state-of-the-art overview of the geology and tectonics of the Southeastern Oman Mountains, and is accompanied by an over-sized geological map and a correlation chart.
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Nicolas, A., and F. Boudier. "Mapping oceanic ridge segments in Oman ophiolite." Journal of Geophysical Research: Solid Earth 100, B4 (April 10, 1995): 6179–97. http://dx.doi.org/10.1029/94jb01188.

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ROLLINSON, Hugh, and Jacob ADETUNJI. "Chromite in the Mantle Section of the Oman Ophiolite: Implications for the Tectonic Evolution of the Oman Ophiolite." Acta Geologica Sinica - English Edition 89, s2 (December 2015): 73–76. http://dx.doi.org/10.1111/1755-6724.12308_44.

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SAVELYEVA, G. N., and V. G. BATANOVA. "Chromite in the Mantle Section of the Oman Ophiolite: Implications for the Tectonic Evolution of the Oman Ophiolite." Acta Geologica Sinica - English Edition 89, s2 (December 2015): 77–78. http://dx.doi.org/10.1111/1755-6724.12308_45.

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Tsuchiya, Nobutaka, Tomoyuki Shibata, Masako Yoshikawa, Yoshiko Adachi, Sumio Miyashita, Tatsurou Adachi, Nobuhiko Nakano, and Yasuhito Osanai. "Petrology of Lasail plutonic complex, northern Oman ophiolite, Oman: An example of arc-like magmatism associated with ophiolite detachment." Lithos 156-159 (January 2013): 120–38. http://dx.doi.org/10.1016/j.lithos.2012.10.013.

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Dissertations / Theses on the topic "Oman ophiolite"

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Trutner, Sarah D. "An Investigation of AMS in Oman Ophiolite Gabbros." Oberlin College Honors Theses / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1470493515.

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Wilson, Robin A. "Geochemistry of metalliferous sediments from the northern Oman ophiolite." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4979/.

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A range of siliceous, ferruginous and ferromanganiferous deposits are intercalated with, and overlie the lavas of the Late Cretaceous northern Oman ophiolite. Most of the deposits lie on the upper surface of the spreading event lavas; spreading event magmatism and later seamount-building events are coeval to relatively small metalliferous sediment deposits. The mineralogical and geochemical characteristics of these sediments are a function of the interaction between local hydrothermal systems, the marine depositional environment, and early diagenetic transformations. Various techniques are employed to objectively determine the actual end-member component compositions from which the metalliferous sediments formed. The sediments are a mixture of primary biosiliceous oozes and hydrothermal metallic components which were deposited at or near a marginal ocean-basin spreading axis during Cenomanian time. Factor analysis, selective acid leaching experiments and linear programming modelling identify six geologically reasonable end-members, which represent biosiliceous sediment, carbonate sediment, detrital sediment, hydrogenous sediment, and hydrothermal sediment. The techniques show that the sediments have a complicated hydrothermal history which is associated with the evolution of the Oman ophiolite. The hydrothermal component is sub-divided into high temperature and low temperature end-members which are characteristic of the proto-seamount and proto- rift event environments respectively. Vent proximal and vent-distal facies are described. The geochemistry of the deposits provides evidence for calcareous pelagic dissolution by hydrothermal fluids, which resulted in the relative concentration of a hyaloclastic component. The deposits which were not early-lithified are epidotized. Metamorphic transformation of the primary sediment occurred prior to eruption of the upper lava unit. The techniques which have been used to describe the range, composition and distribution of the end-member components provide a flexible framework for the characterisation of geological mixing in all marine metalliferous sediments.
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Rospabé, Mathieu. "Etude pétrologique, géochimique et structurale de la zone de transition dunitique dans l'ophiolite d'Oman : identification des processus pétrogénétiques à l'interface manteau/croûte." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30071/document.

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L'origine de la zone de transition dunitique (DTZ) à l'interface manteau-croûte est mal connue, ainsi que les processus physico-chimiques impliqués dans sa genèse. Pour aborder cette question, ce travail a porté sur l'étude pétrologique, géochimique et structurale de 20 coupes (600 échantillons) levées dans la DTZ du massif de Sumail (ophiolite d'Oman), épaisse de plus de 400 mètres à l'aplomb d'un paléo-diapir mantellique. Au-delà des données in situ sur minéraux (microsonde, LA-ICP-MS) et des compositions en éléments majeurs des roches totales, le développement d'une procédure analytique a permis l'acquisition des compositions en éléments en traces des dunites dont les teneurs sont de l'ordre du ng.g-1. La DTZ est faite de dunites pures (olivine et chromite) et de dunites imprégnées, contenant une quantité variable de minéraux interstitiels ayant cristallisé à partir d'un magma percolant. Ces faciès renferment des minéraux d'une variété insoupçonnée incluant, en plus de ceux clairement issus d'un MORB (clinopyroxène et plagioclase), de l'orthopyroxène, amphibole, grenat, et des diopsides témoignant d'un processus d'hybridation entre le MORB et des fluides hydratés. Les forts rapports Mg# et teneurs en TiO2 des orthopyroxènes et amphiboles ainsi que la composition des clinopyroxènes, intermédiaire entre clinopyroxènes magmatiques et diopsides hydrothermaux, a permis de contraindre la composition du magma hybride qui résulterait du mélange entre un magma d'affinité tholéiitique et un fluide supercritique riche en silice, voire trondhjémitique issu de la fusion incongruente hydratée des orthopyroxènes mantelliques, similaire au produit de fusion hydratée des roches environnantes (péridotites serpentinisées, troctolites, gabbros). Ces minéraux sont observés en position interstitielle et en inclusion dans les chromites, témoignant de leur origine précoce et du fait que les magmas hybrides ont participé à la formation de la DTZ. La combinaison des interprétations des données in situ et des données roches totales a permis la déconvolution du message polyphasé enregistré par les dunites : la signature du protolithe, celles de la dunitisation et du rééquilibrage de la matrice d'olivine avec un MORB percolant (métasomatisme cryptique), la signature de refertilisation par la cristallisation des minéraux interstitiels (métasomatisme modal), ainsi que les effets de la serpentinisation. Il apparaît que les dunites pures, caractérisées par un spectres de terres rares en forme de U ou de V, semblent avoir acquis cette signature très précocement, probablement lors de la phase initiale de leur genèse sous l'effet de rééquilibrages avec des liquides très riches en éléments incompatibles (REE, Th, U, HFSE) et pouvant correspondre au magma hybride. L'étude structurale de la DTZ dans le massif de Sumail a montré l'influence de la tectonique synmagmatique sur la structuration de la DTZ, se traduisant par l'alternance d'horizons imprégnés ou non ainsi que par l'évolution verticale sur plusieurs dizaines de mètres des compositions chimiques à l'approche des zones de failles. On l'observe notamment pour les teneurs en éléments immobiles dans les fluides tels que le Ti, les REE ou le Th. La DTZ semble s'être développée dans un environnement transtensif dont les deux systèmes de failles principaux N130 et N165-180 ont accommodé la percolation des magmas et fluides responsables de la dunitisation ainsi que l'introduction des fluides hydrothermaux pouvant conditionner les échanges globaux avec les enveloppes externes.La comparaison avec les DTZ d'autres massifs en Oman ou à Trinity (Californie), ayant évolué dans un contexte magmatique différent, montre également l'importance des failles synmagmatiques dans la structuration de la DTZ. Les liquides qui ont percolé dans ces DTZ apparaissent systématiquement sous-saturés en Al et saturés en H2O, amenant à interpréter le caractère hydraté comme une condition critique pour la genèse des dunites
The origin of the dunitic transition zone (DTZ) between the mantle and the crust is still largely unknown, as well as the physical and chemical processes involved in its genesis. To address this topic, this thesis focused on the petrological, geochemical and structural study of 20 cross-sections (600 samples) collected along the DTZ from the Sumail massif, Oman ophiolite, 400 meters thick and located above a former paleo-mantle diapir. In addition to mineral compositions acquired using in situ methods (microprobe, LA-ICP-MS) and to whole rock major elements, the development of an analytical procedure permitted to determine trace element contents in dunites that display low concentrations (regularly about one ng.g-1). The DTZ is made of pure dunites (olivine and minor chromites), and of impregnated ones, containing a variable amount of interstitial minerals that crystallized from a percolating melt. These latter rocks contain an unexpected mineralogical variety with, in addition to clinopyroxene and plagioclase showing a MORB affinity, the presence of orthopyroxene, amphibole, garnet and diopsides that highlights a hybridization process between the MORB and hydrated fluids. The high Mg# ratio and TiO2 content in orthopyroxene and amphibole together with the clinopyroxene composition, intermediate between igneous clinopyroxene and pure hydrothermal diopside, allow deciphering the nature of the parent melt as the result of the mixing between tholeiitic melt and a supercritical water enriched in silica, or trondhjemitic fluid issued from the hydrated incongruent melting of mantle orthopyroxene, similar to melts produced by the hydrated melting of country rocks (serpentinized peridotites, troctolites, gabbros). All these minerals are observed both in interstitial position and as inclusions in chromite, showing that they crystallized early and that hybrid melts participated to the genesis of the DTZ. The comparison between mineral and whole rock compositions permitted to highlight the different processes that led to the observed chemical signatures of dunites: the protolithe signature, the dunitization process, chemical reequilibration between the olivine matrix and the percolating MORB, refertilization following the crystallization of interstitial minerals, as well as the effects of later serpentinization. Pure dunites, characterized by U or V-shaped REE patterns, seem to have acquired early the LREE-enriched signature that probably results from the reequilibration with silica- and incompatible trace elements-rich fluids (REE, Th, U, HFSE) generated through the harzburgite orthopyroxenes incongruent melting and probably reflecting the hybrid melt that crystallized interstitial hydrous minerals. The structural study of the DTZ in Sumail highlights the effect of synmagmatic faults on the DTZ development, resulting in the alternation between pure and impregnated horizons as well as in the vertical chemical structuration with compositions evolving on few tens of meters until fault zones. This is particularly true for chemical species expected as immobile during weathering as Ti, REE or Th. The DTZ seems to have been developed in a transtensional environment structured by two main faults systems, oriented N130 and N165-180. These faults spatially constrained both the melt flow, thus the dunitization, and the introduction of hydrothermal fluids probably oceanic in origin. This meeting zone between igneous and hydrothermal fluids can strongly influence the chemical exchanges and distribution between the deep lithosphere and the surface. The comparison between the Sumail DTZ and other ones from Oman or Trinity (California) ophiolites, which evolved in a different magmatic setting, shows the systematic role of synmagmatic faults. Melts that percolated these other DTZ were under-saturated in Al and saturated in water, allowing to interpret the hydrated component as an essential condition for dunites genesis at the mantle-crust transition
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Python, Marie. "Nature et répartition des filons basiques dans la section mantellaire de l'ophiolite d'Oman : implications pour la genèse des MORBs." Toulouse 3, 2002. https://tel.archives-ouvertes.fr/tel-00010212.

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Dare, Sarah Anne Sophia. "Chrome-spinel geochemistry of the northern Oman-United Arab Emirates ophiolite." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54747/.

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The Oman ophiolite is the largest and best preserved ophiolite in the world and records a switch from mid-ocean ridge (MOR) to supra-subduction zone (SSZ) setting. This study investigates the geochemical variability of chrome-spinel in the mantle sequence of the poorly known United Arab Emirates (U.A.E.) part of the northern Oman-U.A.E. ophiolite. Extensive field work was carried out and 260 samples collected for petrogenetic studies and geochemical mapping of the U.A.E. mantle. Chrome-spinel geochemistry provides valuable information on bom the residual mantle and on the nature and extent of melt-rock reaction. In particular, it is used to fingerprint the compositions of the magmas that interacted with the mantle lithosphere. This study also develops a new method to analyse gallium in chrome-spinel by Laser Ablation-ICP-MS, and successfully uses it to improve the tectonic discrimination of chrome-spinel. The results show that the U.A.E. mantle lithosphere formed at a MOR-type setting and was modified by melt-rock reaction with MORB-type and SSZ-type melts. This history of melt infiltration strongly resembles the magmatic history of the crustal sequence in each of the Aswad and Khawr Fakkan Blocks. Geochemical mapping illustrates a strong spatial control on the pattern of melt infiltration in the mantle and constrains the proximity of each mantle domain with respect to the subduction zone. The Khawr Fakkan mantle extensively interacted with boninitic melts during subduction initiation. Thus, it was closer to the subduction zone than the Aswad mantle which predominantly interacted with island-arc tholeiite melts. Importantly, this work demonstrates for the first time that the Dibba Zone peridotites originate from pre-existing 'true' MOR mantle lithosphere between the trench and the main body of the ophiolite. A further important conclusion is that the mantle lithosphere of the northern Oman-U.A.E. ophiolite was not the source region for the SSZ magmatism. Previous workers proposed that the plane of detachment and the subduction zone were the same, which implies that the mantle of the ophiolite was the source of the SSZ magmatism. Instead, this study proposes that detachment of the ophiolite took place at a shallower level than the plane of the subduction zone and thus provides strong evidence for a subduction zone at a still deeper level. During detachment, the ophiolite incorporated slices of ultramafic rock near the trench (i.e. the Dibba Zone peridotites) as it bulldozed its way over the underlying plate and onto the continental margin of Arabia.
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Amri, Isma. "Etude pétrologique et structurale d'une dorsale océanique fossile, massif de Sumai͏̈l (ophiolite d'Oman) : implications pour les mécanismes d'accrétion océaniques." Toulouse 3, 1995. http://www.theses.fr/1995TOU30242.

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Un diapir asthenospherique fige a l'axe d'une dorsale oceanique affleure dans la zone de maqsad au sud de l'ophiolite d'oman. Cette zone offre donc la possibilite de percer l'anatomie de la croute oceanique a l'aplomb d'une zone d'accretion. Au voisinage du paleo-moho, les gabbros lites sont envahis par des corps ultrabasiques (wehrlites-troctolites et dunites). Certains de ces corps s'enracinent au niveau du moho et remontent jusqu'au sommet de la croute, ou vient s'enraciner directement le complexe filonien nw-se. Des intrusions pegmatitiques affleurent a la limite de la zone de divergence du flux asthenospherique. Ces pegmatites forment une suite differenciee: pyroxenites, gabbros-gabbros norites, diorites et plagiogranites. Les plagiogranites profonds ont des plagioclases tres calciques (an% 90-95) temoignant d'une genese par la fusion partielle de l'encaissant. Les filons se sont reveles de bons marqueurs spatiaux et temporels de l'evolution du magma extrait de la fusion partielle du diapir. Ces filons ont permis egalement de suivre le prolongement du diapir sous la croute. Ce resultat est conforte par une structure en dome dans les cumulats lites. L'existence d'une transition entre une croute inferieure plastique et superieure fragile a ete revelee par l'etude des structures d'ecoulement visqueux et de deformation plastique dans les gabbros lites, coherente avec la repartition verticale des filons. Ces nouvelles donnees confortent un scenario de montee d'un diapir asthenospherique, et d'ouverture progressive du centre d'expansion de maqsad. Une conclusion integrant ces arguments aux donnees geophysiques marines permet de confirmer et d'expliquer la grande variete de facies lithologiques, recemment reconnus dans la croute oceanique dans les dorsales actuelles
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Lilly, Richard Mark. "Magmatic evolution and crustal accretion of the northern Oman-United Arab Emirates ophiolite." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/56058/.

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The Magmatic Evolution and Crustal Accretion of the northern Oman-U.A.E. ophiolite The Oman-United Arab Emirates (U. A.E.) ophiolite is the largest and best-preserved ophiolite complex in the world and has assumed critical importance in guiding ideas as to the functioning of mid-ocean ridge magma chambers and accretion of lower crust formed at a fast-spreading ridge. The portion of the ophiolite within the United Arab Emirates has received much less study than that within the Sultanate of Oman, particularly with regard to its magmatic evolution. Fieldwork has been conducted in co-operation with the British Geological Survey on the ophiolite sections in the U.A.E. Geochemical and field characteristics of these plutonic and extrusive units provide important constraints on the influence subduction-related fluids have on crustal accretion processes. Initial VI magmatic events exhibit a MORB-like composition and record mid-ocean ridge accretion processes which relate to modern crust, forming from steady-state magma chambers. The Khawr Fakkan Block provides the first 'true' MORB mantle source signature to be documented in the Oman-U.A.E. ophiolite, which represents pre-subduction zone influenced oceanic crust and applies constraints to the mechanisms and timing of subduction initiation and propagation. These primary events were followed by V2 magmatic events in a supra subduction zone (SSZ) setting, with plutonic magmatism localised predominantly along major faults. Each subsequent magmatic event exhibits an increase in the subduction related component to the mantle source. The V2, SSZ, magmatic period of the northern Oman-U.A.E. ophiolite can be regarded as an embryonic volcanic arc, which ceased magmatism and was obducted before reaching maturity. The northern Oman-U.A.E. ophiolite records the transition from spreading- to subduction-related volcanism in a SSZ setting within a marginal (fore-arc) basin, representing the change from steady-state to plutonic magmatism. The SSZ signature increases to the north spatially and temporally.
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Davis, A. C. "The hydrothermal contribution to the oceanic strontium budget : insights from the Oman ophiolite." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598391.

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This study uses the strontium isotope tracer system to constrain hydrothermal flux estimates and investigate the hydrothermal contribution to the oceanic strontium budget. This is achieved through a multi-directional approach. Firstly, strontium isotope data for ocean and ophiolite crust are compiled to investigate the degree of isotopic alteration displayed by modern and ancient crustal profiles; and calculate the cumulative hydrothermal contribution to the oceanic strontium budget. This reveals an apparent imbalance in the oceanic strontium budget, because the hydrothermal contribution calculated is only a third of that required to balance a revised riverine input and the buffering effect of carbonate digenesis. Secondly, a multi-phase hydrothermal system in the northern Oman ophiolite is investigated as an analogue for understanding modern oceanic process and the magnitude of hydrothermal fluxes in arc-related environments. Field mapping and trace elements discrimination methods are combined to identify three hydrothermal regimes which correlate with the complex magmatic-tectonic evolution of the area. The first regime is associated with formation and cooling of the crustal sequence within an oceanic spreading environment; the second and third regimes are associated with later magmatism in an off-axis environment. Strontium isotope geochemistry is used to investigate the character of each regime and predict a time-integrated high-temperature fluid flux of ~4.5±1.1 x 107 kg m-2 for the initial spreading related hydrothermal event and lower estimates for the later regimes. The flux calculated is significantly higher than a similar prediction made for mid-ocean ridge systems (eg. Teagle et al, 2003), supporting previous suggestion that oceanic spreading systems in supra-subduction settings support greater hydrothermal fluxes than normal oceanic environments.
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Mervine, Evelyn Martinique. "Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77785.

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Thesis (Ph. D.)--Joint Program in Marine Geology and Geophysics (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Determining timescales of the formation and preservation of carbonate alteration products in mantle peridotite is important in order to better understand the role of this potentially important sink in the global carbon cycle and also to evaluate the feasibility of using artificially-enhanced, in situ formation of carbonates in peridotite to mitigate the buildup of anthropogenic CO₂ emissions in the atmosphere. Timescales of natural carbonation of peridotite were investigated in the mantle layer of the Samail Ophiolite, Sultanate of Oman. Rates of ongoing, low-temperature CO₂ uptake were estimated through ¹⁴C and ²³⁰Th dating of carbonate alteration products. Approximately 1-3 x 10⁶ kg CO₂/yr is sequestered in Ca-rich surface travertines and approximately 10⁷ kg CO₂/yr is sequestered in Mg-rich carbonate veins. Rates of CO₂ removal were estimated through calculation of maximum erosion rates from cosmogenic 3He measurements in partially-serpentinized peridotite bedrock associated with carbonate alteration products. Maximum erosion rates for serpentinized peridotite bedrock are ~5 to 180 m/Myr (average: ~40 m/Myr), which removes at most 10⁵-10⁶ kg CO₂/yr through erosion of Mg-rich carbonate veins.
by Evelyn Martinique Mervine.
Ph.D.
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10

Ambrose, Tyler. "Structure, metamorphism, and tectonics of the northern Oman-UAE ophiolite and underlying metamorphic sole." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:e9520624-0f91-4c9d-a9b9-e9e2fc5d5517.

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Ophiolites - thrust sheets of oceanic lithosphere that have been emplaced onto the continental margin - provide the opportunity to explore the structure and genesis of oceanic crust. As many ophiolites formed above subduction zones, they also allow for the investigation of mantle wedge and subduction interface processes. This the- sis examines the Oman-United Arab Emirates (UAE) ophiolite, which is the largest and most intensely studied ophiolite on Earth. Three distinct problems are addressed. (1) Recent research has proposed that the architecture and tectonic evolution of the ophiolite in the UAE differs from in Oman. In Chapter 2, I test this hypothesis by integrating new geological mapping and field observations with previously published maps of the ophiolite in the UAE. My results indicate that the ophiolite is gently folded, but otherwise largely intact. I demonstrate that the architecture of the ophi- olite in the UAE is not significantly different from in Oman. Thus, there is no basis for a different tectonic evolution as recently proposed. (2) Observations from exper- iments and small-scale natural shear zones indicate that volumetrically-minor phases can control strain localization. In Chapter 3, I test the hypothesis that minor phases control strain-localisation at plate boundaries. To do so, I analyzed peridotites from the base of the ophiolite, a palaeosubduction interface. My results demonstrate that minor phases limited olivine grain growth, which led to rheological weakening. (3) The mechanisms by which metamorphic soles detached from the downgoing slab and accreted to the hanging-wall mantle is unclear. In Chapter 4, I examine a transect across the metamorphic sole in the UAE. My results reveal that granulite formation was more extensive than is typically considered. I propose that granulite formation resulted in rheological strengthening, which caused the subduction interface to migrate into the downgoing slab and accrete the metamorphic sole.
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Books on the topic "Oman ophiolite"

1

W, Shelton A., and Gass I. G, eds. The ophiolite of northern Oman. Oxford [Oxfordshire]: Published for the Geological Society by Blackwell Scientific Publications, 1986.

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Falk, Elisabeth. Carbonation of Peridotite in The Oman Ophiolite. [New York, N.Y.?]: [publisher not identified], 2014.

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Tegyey, Monique. Ophiolite and metamorphic rocks of the Oman mountains: A petrographic atlas. [Oman]: Ministry of Petroleum and Minerals, 1990.

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Ophiolite Conference (1990 Muscat, Oman). Ophiolite genesis and evolution of the oceanic lithosphere: Proceedings of the Ophiolite Conference, held in Muscat, Oman, 7-18 January 1990. Dordrecht: Kluwer Academic Publishers, 1991.

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F, Boudier, and Nicolas Adolphe 1936-, eds. The ophiolites of Oman. Amsterdom: Elsevier, 1988.

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Azri, Hilal Al. Typologie des gisements de chromite dans la partie sud de l'ophiolite du Nord Oman. Orléans, France: BRGM, 1987.

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Coleman, R., Nicolas A, and Tj Peters. Ophiolite Genesis and Evolution of the Oceanic Lithosphere: Proceedings of the Ophiolite Conference, Held in Muscat, Oman, 7-18 January 1990. Springer London, Limited, 2012.

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Bouchez, Jean-Luc, and Adolphe Nicolas. Principles of Rock Deformation and Tectonics. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192843876.001.0001.

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This book, based on laboratory, teaching and field experience, has a strong focus towards hard rocks and magmatic rocks, from both the continental crust worldwide, where quartz and granites are dominant, and the mantle dominated by olivine in peridotites. With more than 250 figures, most of them original, the book develops, in addition to classical structural geology objects, the fundamentals of brittle fracturing of materials, plastic deformation of ice, quartz and olivine, and fabric acquisition in rocks and magmas. Measurement and orientation of stress axes, bases of neotectonics and geophysics, and practical tools such as magnetic fabrics not commonly treated in geological books, are also provided. Emblematic tectonic and geodynamic sites are presented, both from the oceanic and continental crust, for instance the Oman ophiolites, and the India-Eurasia collision and its associated shear zones. Since the targeted readers are present-day young students, a few structural geology exercises are also included in order to improve their abilities.
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Book chapters on the topic "Oman ophiolite"

1

Nicolas, A. "Oman Ophiolite: The Harzburgite Ophiolite Type." In Structures of Ophiolites and Dynamics of Oceanic Lithosphere, 37–90. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2374-4_3.

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Cawood, Peter A. "Processes of Ophiolite Emplacement in Oman and Newfoundland." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 501–16. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_25.

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Blendinger, Wolfgang. "Al Aridh Formation, Oman: Stratigraphy and Palaeogeographic Significance." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 575–92. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_28.

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Al-Harthy, M. S., R. G. Coleman, M. W. Hughes-Clarke, and S. S. Hanna. "Tertiary Basaltic Intrusions in the Central Oman Mountains." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 675–82. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_33.

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Nicolas, A., and H. Al Azri. "Chromite-Rich and Chromite-Poor Ophiolites: The Oman Case." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 261–74. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_14.

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Nicolas, A., and F. Boudier. "Rooting of the Sheeted Dike Complex in the Oman Ophiolite." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 39–54. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_4.

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Calvez, J. Y., and J. L. Lescuyer. "Lead Isotope Geochemistry of Various Sulphide Deposits from the Oman Mountains." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 385–97. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_19.

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Shelton, A. W., and S. S. Egan. "The Obduction of the Northern Oman Ophiolite — Crustal Loading and Flexure." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 469–83. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_23.

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Michard, A., F. Boudier, and B. Goffé. "Obduction Versus Subduction and Collision in the Oman Case and Other Tethyan Settings." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 447–67. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_22.

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Rochette, P., L. Jenatton, C. Dupuy, F. Boudier, and I. Reuber. "Diabase Dikes Emplacement in the Oman Ophiolite: A Magnetic Fabric Study with Reference to Geochemistry." In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 55–82. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_5.

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Conference papers on the topic "Oman ophiolite"

1

Zebker, Molly, Jingyi Chen, and Marc Hesse. "Insar Surface Deformation Signatures Over the Oman Ophiolite." In IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2021. http://dx.doi.org/10.1109/igarss47720.2021.9553671.

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Rioux, Matthew, Joshua M. Garber, Michael P. Searle, James L. Crowley, Mark Schmitz, and Andrew Kylander-Clark. "TEMPORAL EVOLUTION OF THE SAMAIL (OMAN-UAE) OPHIOLITE." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-392332.

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D'Andres, Joëlle, Mark Kendrick, and Vickie Bennett. "Hydrothermal Circulation and Volatile Distribution in The Oman Ophiolite." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6575.

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Jesus, Ana Patrícia, Harald Strauss, Diogo Silva, Mario Goncalves, Michelle Harris, and Damon Teagle. "Sulfur cycling the gabbroic section of the Samail Ophiolite Oman." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5459.

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Amundson, Ronald, and Oliver Chadwick. "Arid Soil Development on Alluvial Fans Derived from Oman Mountains Ophiolite." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.53.

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Garber, Joshua M., Matthew Rioux, Matthew Rioux, Andrew R. C. Kylander-Clark, Andrew R. C. Kylander-Clark, Jeff D. Vervoort, Jeff D. Vervoort, et al. "FAST SUBDUCTION, SLOW EXHUMATION: DATING CONTINENTAL SUBDUCTION BENEATH THE OMAN OPHIOLITE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284338.

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Hurtado, Cecilia, and Christopher M. Bailey. "STRUCTURAL HISTORY OF THE SEMAIL OPHIOLITE, NORTHERN JEBEL AKHDAR CULMINATION, OMAN." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286281.

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Fones, Elizabeth, Daniel Colman, Emily Kraus, Alexis Templeton, John Spear, and Eric Boyd. "Inorganic Carbon Limitation and Diversification of Hydrogenotrophic Methanogens in the Samail Ophiolite, Oman." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.725.

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Becker, Harry, Saskia Weitkamp, W. Lindsay Fleming, Zoe Kaehne, Jessica Stammeier, Philipp Gleißner, J. Elis Hoffmann, Eiichi Takazawa, and Juergen Koepke. "Origin of massive dunites of the crust-mantle transition in the Oman ophiolite at Wadi Zeeb (ICDP Oman Drilling Project)." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19363.

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Gregory, Robert T., and Robert G. Coleman. "THE OPHIOLITE CONUNDRUM: TECTONIC SETTING FOR THE ORIGIN AND EMPLACEMENT WITH EMPHASIS ON OMAN." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286299.

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