 | | Journal (article/letter/editorial) | | Avdella mélange. 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...Al-rich one shows signs of limited Cr-spinel replacement by an opaque spinel phase and clinochlore across grain...Modification of the ore-making Cr-spinel is uneven among the Al-rich chromitite specimens. Textural features |  | | Journal (article/letter/editorial) | | metasomatism that was responsible for producing chromitite – dunite bodies in the unusual phlogopite peridotite...compositional zoning of chromite grains in the podiform chromitite. Metasomatic melt, with or without vapor, reacted...invariably surround them holds that the dunite and chromitite formed by reaction of mantle peridotite with...mineralization. The Finero complex, where the dunite and chromitite appear to have formed by reaction of peridotite...dunite containing decimeter to meter size pods of chromitite surrounded by dunite and cm- to dm-wide clinopyroxenite |  | Benham, A. J., Kováč, 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) | | this study. The first type is a low Cr, PGE-poor chromitite interpreted to have been produced in a mid ocean...orthopyroxenite dykes are also commonly associated with outcrops of chromite. Although Hafisi21 mapped much of...irregular-shaped bodies of dominantly massive chromitite. Subsequent work by the Federal Institute for...fabric/fracturing parallel to the contact with the chromitite. The USBM also undertook trenching, sampling...remaining in place consists of massive 8 Massive chromitite in the side of the C1 chromite quarry (34u 139 |  | | Journal (article/letter/editorial) | | China Chromitites, associated with upper mantle spinel peridotites from the Voidolakkos and Xerolivado...include variably deformed banded and podiform chromitite bodies made up of massive, semi-massive, nodular...anti-nodular, schlieren and disseminated chromian spinel. Chromitites have suffered intense shearing that...Deformation has partly produced elongation of chromian spinel nodules and widespread protocataclastic zones within...Compositional data indicate that these high-Cr chromitite bodies crystallized from melts of boninitic affinities |  | 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 economic–scale 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...42 and occur as extensive lenses of mylonitic chromitite, marking the highest degree of 43 deformation...46 Keywords: Economic chrome ores; podiform chromitite; Vourinos Ophiolite; 47 lithospheric deformation; |  | | 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...Here we present new data for six other podiform chromitite localities from the Oman ophiolite and additional...located about 3 km from the Moho. There the main chromitite body is tabular, about 5 m thick and with a gentle |  | 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) | | 187–208 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 Harold’s Grave chromitite is...Os PGE (IPGE). Analysis of multiple samples of chromitite from chromite quarry spoil tips and surrounding...and a lower Fe3+/Fe2+ ratio than in the other chromitite deposits. This suggests formation from a more...magma that favors the concentration of IPGE in chromitite. It is proposed that the IPGE have been concentrated |  | | Journal (article/letter/editorial) | | hydrous inclusions and nodular textures indicates chromitite formation and alteration under low pressure conditions... Key words ophiolite, Variscan, ferrogabbro, chromitite, silicious inclusions, spreading rate 1 1...volcanics (Coleman, 1977). Ophiolitic ore minerals (Cr-spinel, Fe-Ti oxides) are useful petrogenetic indicators...significant influence of fluids on formation of chromitite bodies (Lorand and Ceuleneer, 1989), as well...minerals. Ultramafic rocks neighboring the gabbroic outcrops (the Radunia and Czernica Hills – Fig. 2) are |  | Berger, Julien, Diot, Hervé, Lo, Khalidou, Ohnenstetter, Daniel, Féménias, Olivier, Pivin, Marjorie, Demaiffe, Daniel, Bernard, Alain, Charlier, Bernard (2013) Petrogenesis of Archean PGM-bearing chromitites and associated ultramafic–mafic–anorthositic 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) | | association of highly calcic anorthosite and Fe-rich chromitite in ultramafic–mafic layered intrusions is almost...1996; Mouri et al., 2009). Archean anorthosite–chromitite complexes in the Australian Pilbara craton have...lavas), banded iron formation (BIF), cipolin and chromitite/anorthositebearing mafic–ultramafic layered complexes...Guelb el Azib complex with the location of chromitite outcrops in the area. The rectangle refers to bloc...magmatic textures or structures are preserved. Spinel veins (Fig. 4d) and rodingitic dykes (hydrogro |  | | Journal (article/letter/editorial) | | six platinum group elements (PGE) in podiform chromitite with maximum values of 2,570 ppb Pt, 6,870 ppb...The unaltered centers of chromite grains in the chromitite within this complex have an unusually large range...range of chromitite compositions from 39 to 69 wt percent Cr2O3, type 2 occurs in chromitite having a...to 61 wt percent Cr2O3 , and type 3 occurs in chromitite having a range of 39 to 51 wt percent Cr2O3....some Pt and Rh, occurred across the range of chromitite composition. Crystallization of Pd with some |  | | 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 – Turkey...felsic-intermediate magmatism; manganese, iron, red bed-type iron, copper, phosphate, strata-bound barite-lead...deposits. Chapter 3 deals with ophiolites and chromitite deposits as important production and export items......................... M. Cemal Göncüoğlu 3 Chromitite Deposits of Turkey in Tethyan Ophiolites.... |  | | 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...In the dunite or basal unit, all specimens from outcrops contain little or no fresh olivine, although fresh |
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