Surprises from the top of the mantle transition zone [PDF]
, 2016 Recent studies of chromite deposits from the mantle section of ophiolites have revealed a most unusual collection of minerals present as inclusions within the chromite. The initial discoveries were of diamonds from the Luobosa ophiolite in Tibet. Further
Dobrzhinetskaya +6 more
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Ophiolite-Hosted Diamond: A New Window for Probing Carbon Cycling in the Deep Mantle
Engineering, 2019 As reported in our prior work, we have recovered microdiamonds and other unusual minerals, including pseudomorph stishovite, moissanite, qingsongite, native elements, metallic alloys, and some crustal minerals (i.e., zircon, quartz, amphibole, and rutile)
Dongyang Lian, Jingsui Yang
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The occurrence, origin, and fate of water in chromitites in ophiolites
American Mineralogist, 2020 Abstract We present petrological investigations and mineral chemistry of several Tethyan ophiolites to reveal the occurrence, origin, and fate of water in podiform chromitites. The results show that clinopyroxene and olivine in chromitites have H2O contents of 801–366 and 53–17 ppm, respectively.
Su B. -X. +8 more
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Mg-RICH THOMSONITE-Ca FROM CHROMITITES OF THE LEKKHOYLA OCCURRENCE, VOYKAR-SYN’YA MASSIF, POLAR URALS [PDF]
Минералогия, 2020 The paper describes a previously unknown isomorphic series between thomsonite-Ca and a hypothetical Mg-rich zeolite. The Mg-rich thomsonite-Ca was found for the first time in hydrothermal veins of the Lekkhoyla chromite occurrence (Polar Urals, Russia ...
S.V. Berzin, D.A. Zamyatin, V.V. Khiller
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Chromian spinel geochemistry as a petrogenetic indicator in the chromitites and peridotites of the Bajgan Complex, Western Makran [PDF]
پترولوژیIntroductionEconomic chromite deposits are very common in ophiolite belts. These deposits usually occur in the uppermost horizons of the ophiolite mantle sequence or within the ultramafic cumulitic rocks at the base of the crustal sequence (González ...
Leila Vahedi +2 more
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FRACTURED TECTONICS OF CHROMITITES OF THE MAIN SARANOVSKOYE DEPOSIT (PERM KRAI)
Геодинамика и тектонофизика, 2022 The Main Saranovskoe deposit is one of the largest chrome deposits in Russia. The chrome ore bodies are localized in the ultramafites of the Northern Saranovsky massif which has been studied since 1907. The research revealed that the massif is similar to
P. B. Shiryayev, N. V. Vakhrusheva
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Closed-system behaviour of the Re-Os isotope system recorded in primary and secondary platinum-group mineral assemblages : evidence from a mantle chromitite at Harold's Grave (Shetland ophiolite complex, Scotland) [PDF]
, 2015 This study evaluates in detail the mineral chemistry, wholerock and mineral separate Os-isotope compositions of distinct platinumgroup mineral (PGM) assemblages in an isolated chromitite pod at Harold's Grave which occurs in mantle tectonite in the ...
Badanina, Inna Yu. +4 more
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PGM in chromitites of Kraka massifs (the Southern Urals): diversity and origin
GeoresursyThe paper provides results of study of platinum group minerals (PGMs) from 18 ore occurrences and deposits of the Kraka massifs, most of these located in ultramafic rocks of the upper mantle section (15), and several occurrences in a crust-mantle ...
D. E. Saveliev
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CHROMITITE PROSPECTING USING LANDSAT TM AND ASTER REMOTE SENSING DATA [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015 Studying the ophiolite complexes using multispectral remote sensing satellite data are interesting because of high diversity of minerals and the source of podiform chromitites.
A. Beiranvand Pour +2 more
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Olivine-chrome-spinel equilibrium in chromitites and ultramafites of Rai-Iz massif, Polar Urals
Литосфера, 2016 Olivine and chrome-spinel compositions from chromitites and ore-bearing metamorphosed ultramafic rocks of Rai-Iz massif were compared. It was established that olivine and spinel ferruginosity are directly proportional and increase monotonically from ...
P. B. Shirjaev, N. V. Vakhrusheva
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