Results 161 to 170 of about 2,269 (206)
Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis
Minerals (Basel, Switzerland), 2020 The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to
Shoji Arai +2 more
exaly +2 more sources
Earth and Planetary Science Letters, 2013 AbstractPodiform chromitites have been interpreted as a peridotite/melt reaction product within the upper mantle (= low-P chromitites). Some of them, however, contain ultrahigh-pressure (UHP) minerals such as diamond and coesite (= UHP chromitites). The UHP chromitites can be produced by deep recycling of low-P chromitites via mantle convection. Carbon-
Shoji Arai
exaly +2 more sources
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.
Yongfeng Zhu
exaly +2 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Peridotites, chromitites and diamonds in ophiolites
Nature Reviews Earth & Environment, 2021Ophiolites, which represent segments of oceanic lithosphere obducted onto the continental crust, provide an important window into processes such as continental rifting, mantle melting, asthenospheric upwelling and cooling of oceanic lithosphere. Traditionally, research has focused on crustal sections of ophiolites.
Jingsui Yang +3 more
openaire +1 more source
Petrogenesis of ophiolitic chromitite
Geological Society, London, Special Publications, 1993Abstract 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, 2014Abstract 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. +7 more
openaire +2 more sources
Formation and modification of chromitites in the mantle
Lithos, 2016Abstract Podiform chromitites have long supplied us with unrivaled information on various mantle processes, including the peridotite-magma reaction, deep-seated magmatic evolution, and mantle dynamics. The recent discovery of ultrahigh-pressure (UHP) chromitites not only sheds light on a different aspect of podiform chromitites, but also changes our ...
Shoji Arai, Makoto Miura
openaire +1 more source
Advances in the understanding of chromitite deposits
Applied Earth Science, 2009Chromitites in ophiolites and layered intrusions are the primary source of high quality chromium ore. Some chromitites can also carry significant concentrations of the platinum-group elements (PGE) and in the case of the Upper Group 2 (UG2) chromitite of the Bushveld Complex (South Africa) the PGE are the primary resource.
Mondal, Sisir Kanti, McDonald, Iain
openaire +2 more sources
Lithos, 2021
Abstract Podiform chromitites are unique rock units of ophiolites and ophiolitic melanges and represent invaluable repositories that reliably record the formation environment and evolution of their source and host rocks. However, there are relatively few podiform chromitites reported from Archean terranes. Here we document the major, minor, and trace
Yang Huang +8 more
openaire +1 more source
Abstract Podiform chromitites are unique rock units of ophiolites and ophiolitic melanges and represent invaluable repositories that reliably record the formation environment and evolution of their source and host rocks. However, there are relatively few podiform chromitites reported from Archean terranes. Here we document the major, minor, and trace
Yang Huang +8 more
openaire +1 more source