Results 41 to 50 of about 194 (169)
The Cedrolina Chromitite, Goiás State, Brazil: A Metamorphic Puzzle [PDF]
Minerals, 2016 The Cedrolina chromitite body (Goiás-Brazil) is concordantly emplaced within talc-chlorite schists that correspond to the poly-metamorphic product of ultramafic rocks inserted in the Pilar de Goiás Greenstone Belt (Central Brazil). The chromite ore displays a nodular structure consisting of rounded and ellipsoidal orbs (up to 1.5 cm in size), often ...
de Melo Portella, Yuri +6 more
openaire +3 more sources
Recycling Subducted Organic Carbon as Diamonds: An Example From the New Caledonia Forearc Ophiolite
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.Abstract Micro‐diamonds and moissanite (SiC) have been identified in ophiolitic mantle harzburgites and chromitites of the New Caledonian Peridotite Nappe. The pale yellow (100–250 μm) micro‐diamonds and light blue moissanite (mean −26.5‰, range −33.5‰ to −23.8‰ and mean −26.9‰, range −31.8‰ to −25.6‰ respectively) exhibit consistently strong negative ...
Jonathan C. Aitchison +7 more
wiley +1 more source
Geologica Acta, 2011 Chromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time.
F. ZACCARINI +6 more
doaj
Ore Geology Reviews, 2011 Chromite ores formation is still a debated topic and, in this study, detailed analyses of major, minor elements by EMPA and Rare Earth Elements (REE) by SIMS, were performed on silicate inclusions detected in chromite grains of chromitite pods, enveloping dunites and on clinopyroxene of lherzolitic host rock of well known Trodoos chromite ores. Results
Merlini A +3 more
openaire +4 more sources
Geostandards and Geoanalytical Research, Volume 49, Issue 1, Page 9-50, March 2025.Key Points Comprehensive review of dissolution‐decomposition methods based on acid attack and molten salt fusion. Dissolution remains the preferred method for many modern instrumental measurement principles e.g., ICP‐MS, ICP‐AES and TIMS. Comprehensive reviews of flux-free fusion for glasses and production of pressed powder pellets for analysis by EPMA,
Philip Robinson
wiley +1 more source
Iraqi Geological Journal, 2022 New geochemical data were presented for the mafic (basalts and gabbros) and ultramafic (dunites, serpentinites and pyroxenites) rocks from the Mawat ophiolite exposed in the Zagros suture zone in northeastern Iraq.
Heider Al Humadi +2 more
doaj +1 more source
Low Temperature Sabatier CO2 Methanation
ChemCatChem, Volume 16, Issue 24, December 20, 2024.This review exhaustively summarizes the advances made since the beginning of the century in the field of the Sabatier reaction conducted at temperatures less than or equal to 200 °C. Thermal catalysis as well as plasma‐assisted and photo‐assisted catalysis are described there.
Clément Molinet‐Chinaglia +2 more
wiley +1 more source
Записки Горного института, 2022 A comprehensive study of a 340 m thick lenticular-sheet body of ultramafic composition penetrated by structural well M-1 at a depth of about 2.2 km was accomplished.
Valeriy F. Smolkin +4 more
doaj +1 more source
Tibetan chromitites: Excavating the slab graveyard
Geology, 2015 Podiform chromitites enclosed in depleted harzburgites of the Luobusa massif (southeastern Tibet) contain diamond and a highly reduced trace-mineral association. Exsolution of diopside and coesite from chromite suggests inversion from the Ca-ferrite structure in the upper part of the mantle transition zone (>400 km).
McGowan, Nicole +8 more
openaire +4 more sources
Genesis of podiform chromitites – a review of models
NEWS of the Ural State Mining University, 2020 Relevance of the work. Research aimed at identification of genesis of chromium ores in alpine-type hyperbasites has been conducted by scientists (geologists, petrologists and geochemists) around the world for more than a century. Nevertheless, the issue of their origin remains debatable to this day.
Pavel Borisovich SHIRYAEV +1 more
openaire +1 more source