Results 51 to 60 of about 2,269 (206)

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

Magnetotellurics Point to Serpentinization as a Potential Source of Hydrogen in the Bulqizë Ophiolite

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract Hydrogen was first detected in the Bulqizë ophiolite massif (Albania) in 1992, and its origin remains uncertain, with hypotheses ranging from active serpentinization to the release of trapped, fossil H2. To constrain the thickness of the ophiolite layer—a key parameter for evaluating hydrogen generation—we conducted a magnetotelluric survey ...
Yan Yao, Frédéric‐Victor Donzé, Mathieu Persem, Laurent Truche, Bardhyl Muceku, Stéphane Garambois, Ivan Vujevic, Nicolas Lefeuvre, Edmond Goskolli   +8 more
wiley   +1 more source

Bismuth-nickel mineralization in chromitites of Mariinskii deposit (Urals emerald mines)

Литосфера, 2018
The unusual Bi-Ni mineralization, represented by parkerite, millerite, bismutohauchecornite, bismuthinite, nickeline and, possibly nickel analogue of smythite (?), found in the metasomatically altered chromite rocks of the Mariinsky emerald-beryllium ...
Mikhail P. Popov, Yurii V. Erokhin, Vera V. Khiller   +2 more
doaj   +2 more sources

Хромититы Харчерузского блока массива Сыум-Кеу: вещественный состав и генезис руд (Полярный Урал) [PDF]

, 2016
Актуальность работы обусловлена необходимостью детального петрологического исследования слабо изученных ультрабазитовых массивов России с позиции их потенциальной рудоносности на хромитовое оруденение, являющееся в настоящее время остродефицитным сырьем ...
Чернышов, Алексей Иванович, Юричев, Алексей Николаевич   +1 more
core  

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

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

The metallogenic evolution of the Greater Antilles [PDF]

, 2011
The Greater Antilles host some of the world's most important deposits of bauxite and lateritic nickel as well as significant resources of gold and silver, copper, zinc, manganese, cobalt and chromium.
Lewis, J.F., López-Kramer, J., Nelson, C.E., Proenza, J.A.   +3 more
core   +6 more sources

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

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

Geochemical and Characteristics of Mafic and Ultramafic Rocks of the Suprasubduction Zone Mawat Ophiolite, NE Iraq

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, Markku Väisänen , Sabah Ismail   +2 more
doaj   +1 more source