Results 41 to 50 of about 191 (177)

Compositional variations of chromite and solid inclusions in ophiolitic chromitites from the southeastern Turkey: Implications for chromitite genesis

Ore Geology Reviews, 2014
Abstract Chromitites, associated with upper mantle peridotites of ophiolites from southeastern Turkey, are lenticular bodies or veinlets made up of massive, banded and disseminated chromite. Chromite shows a wide range of Cr# [Cr/(Cr + Al)] varying between 0.42 and 0.81, and Mg# [Mg/(Mg + Fe2 +)] of 0.45 to 0.75.
Akmaz, Recep Melih, Uysal, Ibrahim, Saka, Samet   +2 more
openaire   +3 more sources

Podiform Chromitites in the Sorkhband Ultramafic Complex, Southern Iran: Evidence for [PDF]

Journal of Sciences, Islamic Republic of Iran, 2008
The podiform chromitite deposits of the Ordovician Sorkhband ultramafic complex, southwestern Makran, are the largest chromitite deposits in Iran. The Sorkhband ultramafic complex comprises of a northern part of dunite, podiform chromitite, olivine ...
doaj  

Chemical Characterization of Chromite from the Crominia and Mairipotaba Massifs, Goiás, Brazil [PDF]

Geologia USP. Série Científica, 2010
Metaultramafi c bodies tectonically emplaced within the metasedimentary sequence of the Araxá Group are associatedwith an ophiolitic melange in southeast Goiás. In the region of Cromínia - Mairipotaba, they occur as lenticular bodiesaligned E-W. Cumulate
Nélson Angeli, Guillermo Rafael Beltran Navarro, Antenor Zanardo, Silvio Roberto Farias Vlach   +3 more
doaj  

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, Daniel Patias, Dominique Cluzel, Trevor R. Ireland, Renjie Zhou, Dongyang Lian, Jingsui Yang, Zhen Yan   +7 more
wiley   +1 more source

Spectral Response of Few Important Textural Variants of Chromitite and its Potential in Estimating Relative Grades of Chromitite – A Case Study for Chromitite of Nuggihalli Schist Belt, India

Current Science, 2018
We have collected, processed and analysed the reflectance spectra of representative chromitite samples of spot type, clot type and disseminated type textural variants to understand the diagnostic spectral features of each of these samples. We have found that the reflectance spectrum of each textural variant is distinct from the spectra of other ...
Arindam Guha, Biswajit Ghosh, Sukanya Chaudhury, Komal Rani, K. Vinod Kumar   +4 more
openaire   +1 more source

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, Zaccarini, Federica, Luvizotto, George L., Garuti, Giorgio, Bakker, Ronald J., Angeli, Nelson, Thalhammer, Oskar   +6 more
openaire   +3 more sources

The Troia–Pedra Branca mafic–ultramafic complex, Borborema Province, Brazil: Records of 2.04 Ga post–collisional Alaskan–type magmatism and PGE mineralization

Journal of the Geological Survey of Brazil, 2021
The Troia–Pedra Branca complex is the most extensive exposure of mafic–ultramafic rocks in the Borborema Province, northeastern Brazil. Chromitite occurrences in this unit are known for a long time, particularly because of its platinum group element (PGE)
Felipe Grandjean da Costa, Wagner da Sila Amaral, Hector Rolando Barrueto, João Luiz Carneiro Naleto, Joseneusa Brilhante Rodrigues, Iaponira Paiva Gomes   +5 more
doaj   +1 more source

GGR Handbook of Rock and Mineral Analysis Chapter 2 (Part 1) Analysis of Geological Materials – 1: Sample Preparation Methods

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

Probe and SIMS investigation of clinopyroxene inclusions in chromites from the Troodos chromitites (Cyprus): Implications for dunite–chromitite genesis

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, Grieco G, Ottolini L, Diella V   +3 more
openaire   +4 more sources

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, Seema Shafiq, Philippe Serp   +2 more
wiley   +1 more source