Chromitiferous

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August undefined, 2024

WebRead Volume 72 Issue 7 of Economic Geology. Ultramafic-Hosted Ni-Cu-Co-(As) Mineralization from an Ancient Oceanic Transform Fault Zone in the Troodos Ophiolite, Cyprus: An Analogue for Ultramafic Sea Floor Massive Sulfide Mineralization? WebChromite deposits in the northern Oman ophiolitic complex occur in three structural contexts, i.e., (1) at the base of the cumulate series, (2) in the top kilometer of the mantle sequence, and (3) in the deeper parts of the mantle.

The chromitiferous rocks of the Troodos ophiolite complex, Cyprus ...

Webchromitiferous orthopyroxenite approximately 0.02 m thick. This is in turn overlain by the massive chromitite (1.04 m thick). The chromitite itself has negligible amounts of inter … WebSep 1, 1999 · Compositional variation of chromite is limited within the massive LG6 Chromitite layer, where chromite is the sole cumulus phase. Compositions vary significantly in chromitiferous orthopyroxenite and in those samples where the immediate contact between the silicate and oxide cumulates has been intersected. fit für den testdaf audio download

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WebBoth laterally and vertically, chromite occurs as persistent layers, lenses or pockets in the serpentinized and silicified dunite-peridotite extending over a strike length of 25 km. The ultramafic rocks and the chromitite layers are cofolded with the Iron-Ore Supergroup into a plunging syncline. WebAn evaluation of chromitiferous layers and their host rocks in the Platreef, on the Turfspruit and Zwartfontein properties: A comparative study with the main Bushveld Complex. By … WebDec 13, 2024 · Dunite-hosted PGE mineralization is spatially associated with thin discontinuous layers and schlieren of chromitite and chromitiferous dunite and is characterized by marked enrichments in iridium-subgroup PGE (IPGE) relative to palladium-subgroup PGE (PPGE). fit furniture fittings durban

Geological features and origin of the chromite deposits of …

Chromite chemistry and platinum-group element distribution …

WebThe upper ultramafic unit contains, more frequently, pegmatoidal sections, and the Chromitiferous Harzburgite unit has less massive chromitite layers than the … Websaturated in chromite and left a chromitiferous anortho-sitic residue. Formation of a chromitite seam was assumed to have been aided by deformation of a mush and the migration and trapping of chromite seed crys-tals at lithological contacts. Scoon & Costin (2024) sug-gested that thin chromitites in the Upper Critical Zone fit fun west homepageWebApr 1, 2003 · Abstract. Low-grade nickeliferous laterites from the Sukinda region, Orissa, India, were characterized by microscopic investigations, using X-ray diffraction (XRD), … fit fun west

"WebThe chromitiferous ore is rich in Fe–Ni–Cu sulfides and PGEs. Concentration of disseminated sulfides in the upper parts of basement gneisses is caused by downward migration of residual sulfide liquid and fractionation out of the remaining platinum elements. Sulfide-rich zones with massive sulfides accumulating at the footwall are due to the ... " - Chromitiferous

Chromitiferous

WebThe chromitites are concordant cumulates and are associated with distinct chromitite-bearing sequences within the mantle peridotites. Refractory and metallurgical chromite deposits are spatially separated and related to different lithologic associations, which crystallized from different parental magmas. WebFeb 1, 1996 · The chromitiferous rocks of the Troodos ophiolite complex, Cyprus D. Greenbaum Geology 1977 The Troodos massif is a well-developed ophiolite complex comprising a sequence of basaltic volcanic rocks overlying a plutonic complex of upper gabbros and lower peridotites containing podiform… Expand 115 Chromite deposits in …

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WebThe chromitiferous rocks range from disseminations and minor segregations of chromite in dunite to orebodies of economic size and grade composed of nearly … WebDec 1, 2007 · The chromitiferous ore body is situated between the transition . zone of dunite and harzburgite which belong to the Ye sildag ultramafic rock units. The Yesildag …

WebThe chromitiferous rocks consist of disseminations and minor segregations of chrome-spinels in dunite or harzburgite. The chrome-spinels have been preserved in the in-situ … WebThe chromite orebodies are structurally classified into three major types: (1) concordant tabular deposits, (2) strings of pods and (3) pocketlike deposits. Concordant tabular deposits show a gradational transition from chromitite to host rock (modal grading) and are characterized by the parallelism of ore and host-rock structures.

WebThe complex is composed of several persistent lithological units from the base upwards: Basal Gabbro 3–6 m thick; Lower Harzburgite 30–40 m thick; Chromitiferous Harzburgite 30–60 m thick; Main Harzburgite up to 400 m thick; Upper Pyroxenite 60–70 m thick; Gabbronorite and Upper Gabbro units up to 300 m thick with chilled and quenched zones … WebJan 2, 2024 · The anorthosites are also characterized by a slightly smaller average plagioclase grain size than plagioclase in the norite (1·41 mm and 1·54 mm, …

WebDec 31, 2024 · The upper ultramafic unit contains, more frequently, pegmatoidal sections, and the Chromitiferous Harzburgite unit has less massive chromitite layers than the southeastern parts of the complex, whereas the gabbro(-norite) units contain more interstitial liquid with late-stage minerals. The findings confirm that the anvil-shaped intrusion in ...

WebA. Disrupted member of the Disrupted group showing discontinuous chromitite layers that are interpreted to have been disturbed by processes analogous with "soft sediment-like" deformation. The... can high blood sugar affect hearingWebDec 1, 2010 · The rejects of the beneficiation process contains chromite which can be used as a feed for the ferro chrome plants. Through physical beneficiation the iron enrichment … fit fürs goethe-zertifikat a2 скачатьWebThe chromitiferous rocks of the Troodos ophiolite complex, Cyprus D. Greenbaum Geology 1977 The Troodos massif is a well-developed ophiolite complex comprising a sequence … fit fürs officeWebChromitiferous overburden containing nickel in oxide form is reduced with CO-CO2-N2 gas mixtures. This converts the nickel oxide to metallic nickel and restricts the iron oxide to the magnetite state to extract the nickel. Reduction experiments were carried out on 500-g samples in a bench-scale vertical reactor. The tests were run to establish the process … fit fürs goethe-zertifikat b2 audio downloadWebAug 14, 2013 · The few metres to 200 m thick on the Chrome, Page, Peterson chromitiferous zone on the Chrome property in general Block and National-Ledin properties (Figure GS-19-3). contains numerous straight, continuous, massive chro- The transition series was either absent or ranges from 1 to mitite (>85% chromite) seams … fit fürs abi mathematikWebFeb 2, 2024 · The work investigates the effect of sulfuric acid baking on rare earth element (REE) extraction from two waste rock samples from a phosphate mine. The role of different mineralogical assemblages and the degree of alteration (i.e., weathering), and the behavior of the main impurities–iron, phosphorus, and calcium–on REE extraction … fit fürs goethe-zertifikat a2 audioWebShinkle, David; University of Minnesota Duluth. Department of Geological Sciences. (2014). "The Black Thor Igneous Complex: A Chromitiferous Ultramafic-mafic Layered Intrusion … fit fürs goethe-zertifikat a2