 | | Journal (article/letter/editorial) | | metasomatism that was responsible for producing chromitite â dunite bodies in the unusual phlogopite peridotite...recorded in compositional zoning of chromite grains in the podiform chromitite. Metasomatic melt, with or without...vapor, reacted with chromite to produce core-to-rim Cr enrichment of extant chromite grains and was concurrent...core-to-rim Al enrichment in chromite and crystallization of amphibole between chromite and clinopyroxene. This... serpentinization of olivine locally depleted chromite in Al and enriched it in Fe and formed minor amounts |  | | Journal (article/letter/editorial) | | Avdella mĂ©lange. The most sizeable block is a chromitite-bearing serpentinite showing a mesh texture....different chromitite pods are recognized in the studied serpentinite fragment, a Cr-rich chromitite and a...a high-Al chromitite, which have been ascribed to crystallization from a single, progressively differentiating...ore-making Cr-spinel is uneven among the Al-rich chromitite specimens. Textural features such as olivine...variations are suggestive of restricted ferrian chromite (and minor magnetite) substitution for Cr-spinel |  | Benham, A. J., KovĂĄÄ, P., Petterson, M. G., Rojkovic, I., Styles, M. T., Gunn, A. G., McKervey, J. A., Wasy, A. (2009) Chromite and PGE in the Logar Ophiolite Complex, Afghanistan. Applied Earth Science, 118 (2) 45-58 doi:10.1179/174327509x434957 | Journal (article/letter/editorial) | | Chromite and PGE in the Logar Ophiolite Complex, Afghanistan A. J. Benham*1, P. KovaÌcÌ2, M. G. Petterson1...this study. The first type is a low Cr, PGE-poor chromitite interpreted to have been produced in a mid ocean...indicate PGE remobilisation and enrichment. Keywords: Chromite, PGE, Platinum, Ophiolite, Afghanistan Dedicated...2000 km2 and is about 65 km long by 45 km wide.1 Chromite mineralisation has been known from Logar Province...paper presents the first modern research into chromite and platinum-group elements (PGE) in Afghanistan |  | | Journal (article/letter/editorial) | | include variably deformed banded and podiform chromitite bodies made up of massive, semi-massive, nodular...Compositional data indicate that these high-Cr chromitite bodies crystallized from melts of boninitic afïŹnities...corresponds to ferrian chromite. Microscopic studies revealed that ferrian chromite is paragenetically associated...associated with clinochlore even in unaltered chromitite specimens and the degree of serpentinization...was responsible for the formation of the ferrian chromiteâclinochlore association. In addition, magnesiochromite |  | Rassios, A., Tzamos, E., Dilek, Y., Bussolesi, M., Grieco, G., Batsi, A., Gamaletsos, P.N. (2020) A structural approach to the genesis of chrome ores within the Vourinos ophiolite (Greece): Significance of ductile and brittle deformation processes in the formation of economic ore bodies in oceanic upper mantle peridotites. Ore Geology Reviews, 125. 103684pp. doi:10.1016/j.oregeorev.2020.103684 | Journal (article/letter/editorial) | | understanding of ophiolites as hosts to economicâscale chromitite ore deposits 25 requires the integration of...nearly 8- 29 km-thick upper mantle sequence. Chromitite bodies and sub-economic chrome ores 30 occur...petrological Moho; 31 but, economic concentrations of chromitite are restricted to a region referred to as the...late magmatic activity, re- 34 concentrated chromite grains in mesoscopic fold noses and created massive-textured...massive-textured 35 ore bodies. Re-equilibration of chromite and chromiteâolivine grains on microscopicâ 36 scale |  | | Journal (article/letter/editorial) | | over 350 km strike length of the Oman ophiolite. Chromitite compositions form a continuum from cr# = 0.501.... . . . . . . . . . . . Relationship between chromitite compositions and geological setting . . . . ... . . . . . . . . 6.1. Structural controls on chromitite genesis . . . . . . . . . . . . . . . 6.2. The... . . . . . . . . . . . . . . 1. Introduction Chromite forms a large number of small podiform deposits...1997). In this study we provide an overview of chromite compositions over the full length of the ophiolite |  | | Journal (article/letter/editorial) | | serpentinites of refractory harzburgitic protoliths. Chromite I from chromitites has variable Cr and Mg numbers...and low TiO2 contents (<0.20 wt.%). Chromite II surrounds chromite I or fills fissures in it and is enriched...and depleted in Al relative to chromite I (Cr# = 0.54 â 0.68). Chromite I grains contain spherical grains...individual ilmenite grains. The moderate Cr# of chromite I points to an its origin from a MORB-type melt...hydrous inclusions and nodular textures indicates chromitite formation and alteration under low pressure conditions |  | Brough, C. P., Prichard, H. M., Neary, C. R., Fisher, P. C., McDonald, I. (2015) Geochemical Variations Within Podiform Chromitite Deposits in the Shetland Ophiolite: Implications for Petrogenesis and PGE Concentration. Economic Geology, 110 (1) 187-208 doi:10.2113/econgeo.110.1.187 | Journal (article/letter/editorial) | | 187â208 Geochemical Variations Within Podiform Chromitite Deposits in the Shetland Ophiolite: Implications...The chromitite at Cliff is enriched in Pt, Pd, and Rh PGE (PPGE) and the Haroldâs Grave chromitite is...multiple samples of chromitite from chromite quarry spoil tips and surrounding chromite-bearing dunite and...and chromite-bearing harzburgite has revealed that there are links between the chromite geochemistry and...Cliff and Haroldâs Grave have a characteristic chromite geochemistry, which distinguishes them from the |  | Berger, Julien, Diot, HervĂ©, Lo, Khalidou, Ohnenstetter, Daniel, FĂ©mĂ©nias, Olivier, Pivin, Marjorie, Demaiffe, Daniel, Bernard, Alain, Charlier, Bernard (2013) Petrogenesis of Archean PGM-bearing chromitites and associated ultramaficâmaficâanorthositic rocks from the Guelb el Azib layered complex (West African craton, Mauritania) Precambrian Research, 224. 612-628 doi:10.1016/j.precamres.2012.10.005 | Journal (article/letter/editorial) | | calcic plagioclase with Fe-, Al-rich but Cr-poor chromite from a hydrous tholeiitic parental magma, similar...association of highly calcic anorthosite and Fe-rich chromitite in ultramaïŹcâmaïŹc layered intrusions is almost...1996; Mouri et al., 2009). Archean anorthositeâchromitite complexes in the Australian Pilbara craton have...occurrence of metamorphic versus igneous plagioclaseâchromiteâamphibole associations. In this study, we present...lavas), banded iron formation (BIF), cipolin and chromitite/anorthositebearing maïŹcâultramaïŹc layered complexes |  | | Journal (article/letter/editorial) | | six platinum group elements (PGE) in podiform chromitite with maximum values of 2,570 ppb Pt, 6,870 ppb...concentrations. The unaltered centers of chromite grains in the chromitite within this complex have an unusually...the composition of the chromite. Type 1 occurs across the range of chromitite compositions from 39 to...occurs in chromitite having a range of 53 to 61 wt percent Cr2O3 , and type 3 occurs in chromitite having...alloys and laurite, both commonly enclosed in chromite, as well as members of the irarsite hollingworthite |  | | Book | | eastern section of Europe. The Sea of Marmara, which is an inland sea, together with the Dardanelles...by the Mediterranean Sea to the south, the Aegean Sea to the west and the Black Sea to the north â Turkey...mining industry include metallic ores, such as chromite, copper, lead, zinc, iron, gold and industrial...ages and genetic characteristics (Engin 2002). Chromite, magnesite, olivine, asbestos and copper are found...felsic-intermediate magmatism; manganese, iron, red bed-type iron, copper, phosphate, strata-bound barite-Âlead |  | | Book | | emanations (essentially hydrothermal fluids) reaching the sea floor. In the Introduction to Memoir 131, I said...Paleozoic beds in the Azegour dis trict; their outcrops are grouped in four principal bands that strike...lies a thin formation of reddish conglomerate and red clays that may be Permo-Triassic, Permian, or even...deposited from volcanic exhala tions that reached the sea floor to deposit their loads. If the latter is correct...placers-IB. RHODESIA THE GREAT DYKE Early Precambrian Chromite Magmatio-lb Allsopp, H. L., 1 9 6 5 , Rb-Sr |
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