Formation of transgressive anorthosite seams in the Bushveld Complex via tectonically induced mobilisation of plagioclase-rich crystal mushes [PDF]
, 2016 The formation of anorthosites in layered intrusions has remained one of petrology’s most enduring enigmas. We have studied a sequence of layered chromitite, pyroxenite, norite and anorthosite overlying the UG2 chromitite in the Upper Critical Zone of the
Karykowski, Bartosz +2 more
core +6 more sources
Surprises from the top of the mantle transition zone [PDF]
, 2016 Recent studies of chromite deposits from the mantle section of ophiolites have revealed a most unusual collection of minerals present as inclusions within the chromite. The initial discoveries were of diamonds from the Luobosa ophiolite in Tibet. Further
Dobrzhinetskaya +6 more
core +1 more source
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 +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 +2 more
doaj +2 more sources
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
Phlogopite and Hornblende in the Contact Metamorphosed Ultramafic Complex at Yanomine, Sangun Metamorphic Zone, Japan [PDF]
, 1999 Phlogopite and hornblende were found in amall amounts in the contact-metamorphosed dunite-harzburgite complex at Yanomine. Phlogopite occurs in interstices of silicate minerals in dunite and harzburgite located near the contact with granite.
Inoue, Yoshinori, Kase, Katsuo
core +1 more source
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 +3 more
doaj +1 more source
The Cogne magnetite deposit (Western Alps, Italy): a Jurassic seafloor ultramafic-hosted hydrothermal system? [PDF]
, 2017 The Cogne magnetite deposit (Western Alps, Italy) is the largest in a series of apatite and sulphide-free magnetite orebodies that are hosted in serpentinites belonging to western Alpine ophiolitic units.
Toffolo, Luca
core +1 more source
Genesis of the Sartohay Podiform Chromitite Based on Microinclusions in Chromite
MineralsHere, we present a petrographic and microanalytical study of microinclusions in chromite from podiform chromitites hosted by the Sartohay ophiolitic mélange in west Junggar, northwestern China, to investigate the parental magma evolution and chromitite ...
Xingying Wen, Yongfeng Zhu
semanticscholar +1 more source
Tibetan chromitites: Excavating the slab graveyard
Geology, 2015 Podiform chromitites enclosed in depleted harzburgites of the Luobusa massif (southeastern Tibet) contain diamond and a highly reduced trace-mineral association. Exsolution of diopside and coesite from chromite suggests inversion from the Ca-ferrite structure in the upper part of the mantle transition zone (>400 km).
McGowan, Nicole +8 more
openaire +4 more sources