Results 21 to 30 of about 191 (177)

The origin of Madagascar chromitites

Ore Geology Reviews, 2014
Abstract Precambrian rocks of Madagascar host numerous chromitite occurrences, ranging from centimeter-thick lenses and seams to orebodies containing millions of tons. Production of chromite concentrates and lumpy, coming from Bemanevika mine that was estimated to have a remaining life of 15 years ( Rahaga, 2009 ), establishes Madagascar as the world
G. Grieco, A. Merlini, M. Pedrotti, M. Moroni, R. Randrianja   +4 more
openaire   +1 more source

Petrography and Metamorphism of the MetasedimentaryCountry-Rocks of the Jacurici Valley Chromitite-HostingMafic-Ultramafic Complexes, Bahia,Northeastern Brazil [PDF]

Geologia USP. Série Científica, 2001
Este trabalho enfoca as encaixantes metassedimentares das rochas ultramáficas, portadoras de mineralização de cromita, que ocorrem no nordeste do estado da Bahia. Esta região, conhecida como"Distrito Cromitífero do Vale do Rio Jacurici", apresenta grande
Eliane A. Del Lama, Maria A. F. Candia, Gergely A. J. Szabó   +2 more
doaj   +2 more sources

Solid-state redistribution of mineral particles in the upwelling mantle flow as a mechanism of chromite concentration in the ophiolite ultramafic rocks (on the example of Kraka ophiolite, the Southern Urals)

Georesursy, 2019
The main regularities of the structure of chromitite-bearing zones of ultramafic rock of the ophiolitic association are considered on the example of Kraka massifs.
D.E. Saveliev, V.B. Fedoseev
doaj   +1 more source

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., Robinson P. T., Chen C., Xiao Y., Melcher F., Bai Y., Gu X. -Y., Uysal I., Lenaz D.   +8 more
openaire   +2 more sources

Hydrothermal remobilization platinum group elements and their secondary minerals in chromitite deposits of the Eastern Sayan ophiolites (Russia) [PDF]

E3S Web of Conferences, 2019
Serpentinization is an important post-magmatic process in spreading and subducted zones. This process is the cause of the remobilization and redistribution of highly mobile elements, platinum group elements (PGE) and base metals. Secondary platinum group
Kiseleva Ol’ga, Airiyants Evgeniya, Belyanin Dmytriy, Zhmodik Sergey   +3 more
doaj   +1 more source

Chromitite deposits of Ufaley ultramafic massif (South Urals)

Georesursy
Data on the morphology, composition, textural and structural features of chromite deposits of the Ufaley ultramafic massif are presented. The mineralogical and compositional features of the host ultramafic rocks allow us to interpret them as depleted ...
D. E. Saveliev
doaj   +1 more source

Assessment of Radioactivity in Building Materials

ARO-The Scientific Journal of Koya University
This research investigates the radioactivity levels of various rock types used in construction within the Kurdistan region and assesses their potential impact on human health, the measurements were performed using an HPGe gamma-ray spectrometer.
Adeeb O. Jafir, Mohammed I. Hussein, Idrees A. Nadir, Barzan N. Sabr, Ali H. Hassan   +4 more
doaj   +1 more source

Contamination of useful plant leaves with chromium and other potentially toxic elements and associated health risks in a polluted mining-smelting region of South Africa

Environmental Advances, 2022
Foliar exposure to dust-borne potentially toxic elements (PTEs) is often overlooked in chromium (Cr) mining and industrial regions. A comparative analysis of unwashed (UL) and washed leaves (WL) was conducted to investigate the contribution of dust to Al,
Sutapa Adhikari, João Marcelo-Silva, Johan Paul Beukes, Pieter Gideon van Zyl, Yolindi Coetsee, Ricart Barend Boneschans, Stefan John Siebert   +6 more
doaj   +1 more source

Two new minerals, badengzhuite, TiP, and zhiqinite, TiSi₂, from the Cr-11 chromitite orebody, Luobusa ophiolite, Tibet, China: is this evidence for super-reduced mantle-derived fluids? [PDF]

European Journal of Mineralogy, 2020
Titanium minerals enclosed in corundum separated from the Cr-11 orebody include native Ti, zamboite (FeTiSi2), osbornite (TiN)-khamrabaevite (TiC) solid solutions, and jingsuiite (TiB2), as well as the new minerals badengzhuite (TiP) and zhiqinite (TiSi2)
F. Xiong, F. Xiong, X. Xu, E. Mugnaioli, M. Gemmi, R. Wirth, E. S. Grew, P. T. Robinson, J. Yang, J. Yang, J. Yang   +10 more
doaj   +1 more source

Morphological, textural and structural features of chromitite deposits of Main ore field of Kempirsay massif (South Urals, Kazakhstan)

Georesursy
In the paper data of morphology, textural and structural features of chromitites from deposits of southeast part of Kempirsay massif (South Urals, Kazakhstan) are summarized. It is showed that formation of unique chromium deposits is closely related with
D. E. Saveliev, D. K. Makatov, V. S. Portnov, R. A. Gataullin   +3 more
doaj   +1 more source