Results 61 to 70 of about 23,492 (308)
BSGF - Earth Sciences BulletinAlpine deformation in the meta-ophiolitic nappe of the Upper Oceanic Unit of Corsica occurs under greenschist facies conditions. It is notably characterized by a series of shear zones in metagabbros.
Cenki Bénédicte +4 more
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Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane
Brazilian Journal of Geology, 2020 Mineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example
Amanda Juliano Massuda +5 more
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GENESIS AND MINERAL-GEOCHEMICAL ZONING OF THE QUARTZ-VEIN GOLD DEPOSIT CENTRAL (KUZNETSK ALATAU)
Известия Томского политехнического университета: Инжиниринг георесурсов, 2023 Link for citation: Voroshilov V.G., Molukpaeva D.K., Timkin T.V., Savinova O.V. Genesis and mineral-geochemical zoning of the quartz-vein gold deposit Central (Kuznetsk Alatau). Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023,
Valery G. Voroshilov +3 more
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Impact-generated hydrothermal circulation and metasomatism of the rochechouart astrobleme: mineralogy and major and trace element distribution [PDF]
, 2014 The energy released during a hypervelocity impact on Earth can generate high temperatures in the target rock. There are currently 170 known impact structures worldwide, of which over one-third contain fossil hydrothermal systems [1].
Lee, M.R., Lindgren, P., Simpson, S.S.L.
core
Fe Oxidation State and Oxygen Isotope Composition of Diverse Metasomatized Peridotite Rocks
Terra Nova, EarlyView.ABSTRACT Metasomatic fluids are thought to be oxidising agents that react with the surrounding mantle rocks, causing changes in the bulk Fe3+/ΣFe, their redox state, and affecting the partitioning of trace elements and the fractionation of O isotopes. Worldwide distributed metasomatized peridotites represent the ideal case study to investigate the role
Federica Benedetti +6 more
wiley +1 more source
Geosciences, 2018 This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to
Evgeniy Kozlov +3 more
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Литосфера, 2016 Xenoliths in the Early Cretaceous alkali basalts of Makhtesh Ramon basin (southern Israel) are represented by essentially olivine rocks: dunite (usually including clinopyroxen) - 5% of the total amount, lherzolite - 21%, wehrlite - 28%, clinopyroxenite -
G. B. Fershtater +2 more
doaj +2 more sources
Evidence for an impact-induced biosphere from the δ34S signature of sulphides in the Rochechouart impact structure, France [PDF]
, 2017 The highly eroded 23 km diameter Rochechouart impact structure, France, has extensive evidence for post-impact hydrothermal alteration and sulphide mineralization.
Boyce, A.J. +4 more
core +1 more source
Metasomatized Lithosphere and the Origin of Alkaline Lavas
Science, 2008 Recycled oceanic crust, with or without sediment, is often invoked as a source component of continental and oceanic alkaline magmas to account for their trace-element and isotopic characteristics. Alternatively, these features have been attributed to sources containing veined, metasomatized lithosphere.
Pilet, Sébastien +2 more
openaire +4 more sources
Phlogopite-Olivine Nephelinites Erupted During Early Stage Rifting, North Tanzanian Divergence
Frontiers in Earth Science, 2020 The North Tanzanian Divergence (NTD, eastern branch of the East African Rift) corresponds to an early stage of continental breakup. In the southern NTD, two quaternary volcanoes of the Manyara-Balangida rift (Labait, Kwaraha) have erupted primary ...
Céline Baudouin, Fleurice Parat
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