Results in Earth SciencesThe paper presents the geochemistry, origin and geodynamic setting of podiform chromitite and host rocks from the Buem Structural Unit (BSU) in the northwestern Benin Republic.
Daniel N. Kouagou N’Dah +7 more
doaj +1 more source
Provenance of Lower Cretaceous sediments in the Nariwa and Hokubo areas, Okayama Prefecture, deduced from detrital modes and geochemistry of sandstones [PDF]
, 1996 Petrographic and geochemical study of sandstones from the Kenseki Formation have shown that the sandstones are compositionally immature. The immaturity is reflected geochemically by their low SiO2 contents (52-66 wt%) and petrographically by low modal ...
Daniel K., Asiedu +2 more
core +1 more source
Geostandards and Geoanalytical Research, Volume 48, Issue 1, Page 109-132, March 2024.Key Points Most precise 184Os/188Os ratio yet measured: 0.0013036 ± 0.0000007. New recommended values for DROsS: 186Os/188Os = 0.1199319 ± 0.0000024, 187Os/188Os = 0.1609227 ± 0.0000022, 189Os/188Os = 1.219709 ± 0.000010, 190Os/188Os = 1.983793 ± 0.000011.
Pedro Waterton +4 more
wiley +1 more source
A revised map of volcanic units in the Oman ophiolite: insights into the architecture of an oceanic proto-arc volcanic sequence [PDF]
Solid Earth, 2019 Numerous studies have revealed genetic similarities between Tethyan ophiolites and oceanic “proto-arc” sequences formed above nascent subduction zones. The Semail ophiolite (Oman–U.A.E.) in particular can be viewed as an analogue for this proto-arc crust.
T. M. Belgrano +6 more
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Mineral inclusion and exsolution in mantle rocks from the Luobusa ophiolite, Tibet: origin implication [PDF]
, 2013 HKT-ISTP 2013 ...
Liang, F. H. +3 more
core
Chromitites: An Enigmatic Mantle Rock Type
Chigaku Zasshi (Jounal of Geography), 2010 Various characteristics of podiform chromitites, an enigmatic mantle rock member, are reviewed in this article. Chromitites are composed of chromian spinel, with the general formula (Mg, Fe2+)(Cr, Al, Fe3+)2O4, and silicates (mainly olivine). The Fe3+ content is generally very low, being less than 0.1 to all trivalent cations, in mantle chromian ...
openaire +1 more source
Exhumed Serpentinites and Their Tectonic Significance in Non‐Collisional Orogens
Geochemistry, Geophysics, Geosystems, Volume 25, Issue 2, February 2024.Abstract Exhumed serpentinites are fragments of ancient oceanic lithosphere or mantle wedge that record deep fluid‐rock interactions and metasomatic processes. While common in suture zones after closure of ocean basins, in non‐collisional orogens their origin and tectonic significance are not fully understood.
Damián Donoso‐Tapia +4 more
wiley +1 more source
PETROLOGICAL EVIDENCES OF SYNDEFORMATION SEGREGATION OF CHROMITES DURING DUNITE FORMATION: EXAMPLE OF KRAKA OPHIOLITES, SOUTH URALS [PDF]
Минералогия, 2016 Results of structural and mineralogical studies of chromitite-bearing zone localized in spinel peridotites of the Middle Kraka ophiolite massif are presented.
D.E. Saveliev +4 more
doaj
Subduction Zones of the Caribbean : the sedimentary, magmatic, metamorphic and ore-deposit records UNESCO/iugs igcp Project 546 Subduction Zones of the Caribbean [PDF]
, 2011 The International Union of Geosciences (IUGS) and UNESCO IGCP project 546 Subduction Zones of the Caribbean (http://www.ugr.es/~agcasco/igcp546/) was launched in 2007 and scheduled to be completed by the end of the current year 2011.
García-Casco, A. +2 more
core +6 more sources
Frontiers in Earth Science, 2020 The most abundant terrestrial lavas, mid-ocean ridge basalt (MORB) and ocean island basalt (OIB), are commonly considered to be derived from a depleted MORB-mantle component (DMM) and more specific, variably enriched mantle plume sources.
Anastassia Y. Borisova +13 more
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