Results 191 to 200 of about 4,473 (252)

Chromitite genesis based on chrome-spinels and their inclusions in the Sartohay podiform chromitites in west Junggar of northwest China

Ore Geology Reviews, 2020
Abstract Primary high-Al [Cr# = 100 × Cr/(Cr + Al) of 48.2–54.7] chromitites coupled with high-Cr (Cr# = 70.9–80.7) chromitite fragments are identified in the podiform chromitites hosted by the Sartohay ophiolitic melange in west Junggar, northwest China.
Qing-Bo Zhu, Yongfeng Zhu
semanticscholar   +2 more sources

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.
Recep Melih Akmaz, Ibrahim Uysal, Samet Saka   +2 more
exaly   +4 more sources

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Chromitite Deposits of Turkey in Tethyan Ophiolites

Modern Approaches in Solid Earth Sciences, 2019
Some parts of the Tethyan ophiolites of Alpine-Himalayan suture belt are located within Turkey. The Tethyan belt splits into two branches in Turkey. The northern branch follows the Izmir-Ankara-Erzincan Zone, while the southern branch extends along the Anatolide-Tauride and Bitlis-Zagros suture zone. The subsections of the latter reach Iran in the east
Yahya Çiftçi, Cahit Dönmez, O. Parlak, K. Günay   +3 more
semanticscholar   +2 more sources

Peridotite-chromitite complexes in the Eastern Desert of Egypt: Insight into Neoproterozoic sub-arc mantle processes

Gondwana Research, 2017
Dr Mohamed Khedr
exaly   +2 more sources

Petrogenesis of ophiolitic chromitite

Geological Society, London, Special Publications, 1993
Abstract Chromite deposits comprise an integral part of the mantle sequences observed within many ophiolite complexes; in particular, those where a harzburgite is the dominant mantle sequence lithology. The chromite segregations are invariably contained within a dunite envelope and show a wide variety of ore textures, some of which are ...
Stephen Roberts, Christopher Neary
openaire   +1 more source

Chromitites in ophiolites: How, where, when, why? Part II. The crystallization of chromitites

Lithos, 2014
Abstract A review of previous work relevant to the formation of concentrations of chromite in peridotites from ophiolitic (s.l.) sequences highlights some of the key problems in understanding the complex processes involved. This review forms the basis for chromitite-genesis models that integrate new geochemical data with petrologic, field and ...
Griffin, William L., Proenza, Joaquin A., O'Reilly, Suzanne Y., Gervilla, Fernando, Pearson, Norman J., Arai, Shoji, AKBULUT, MEHMET, Gonzalez-Jimenez, Jose Maria   +7 more
openaire   +2 more sources

Podiform chromitite classification revisited: A comparison of discordant and concordant chromitite pods from Wadi Hilti, northern Oman ophiolite

Journal of Asian Earth Sciences, 2012
Abstract Two types of podiform chromitite, concordant and discordant, were examined in the mantle section of northern Oman ophiolite along Wadi Hilti, to revisit the structural classification of podiform chromitite. They are contrasted in mineral chemical characteristics, in addition to the difference in attitude; the Cr/(Cr + Al) atomic ratio of ...
Shoji Arai, Shinji Yamamoto
exaly   +2 more sources

Discovery of extremely high-Al podiform chromitites from the Lycian (Marmaris) ophiolite, SW Turkey: Implications for chromitite genesis

Ore Geology Reviews, 2020
Abstract The Lycian ophiolite in SW Turkey is mainly exposed in the Marmaris-Koycegiz (Mugla) and Yesilova (Burdur) regions. Its mantle section is widely exposed around Marmaris (=Marmaris peridotite) and is primarily composed of harzburgite of abyssal affinity with sparse lenses of dunites. Unusual chromitites indicating complicated mantle processes
Yongjing Xu, Shouyu Chen, O. Parlak, S. Arai, Cahit Dönmez, Jun Hong   +5 more
semanticscholar   +2 more sources

Origin of Chromitite-Anorthosite Interlayering in the Bushveld Complex

The Canadian Journal of Mineralogy and Petrology
An idealized stratigraphic section of the five main chromitite-bearing cyclic units of the Upper Critical Zone of the Bushveld Complex typically consists of basal chromitite overlain by pyroxenite, norite, and anorthosite.
W. Maier, Sarah-Jane Barnes
semanticscholar   +1 more source

A High-Resolution Geochemical and Petrological Investigation of Bifurcating Chromitite Layers of the UG1 Footwall at Impala Platinum Mine, Rustenburg

The Canadian Journal of Mineralogy and Petrology
One of the most enigmatic features of the world’s largest layered intrusion, the Paleoproterozoic Rustenburg Layered Suite of the Bushveld Complex, is the bifurcation of chromitite layers associated with the UG1 chromitite.
F. Roelofse, Justine Magson, Mariska Nicholson, Tshepo Nyakane   +3 more
semanticscholar   +1 more source