Archean Komatiitic Sill-hosted Chromite Deposits in …
Archean Komatiitic Sill-hosted Chromite Deposits in the Zimbabwe Craton. August 2008. Economic Geology 103 (5):981-1004. DOI: 10.2113/gsecongeo.103.5.981. …
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Chromite ore beneficiation: prospects and challenges
The chromite stretch can be of kilometers and huge tonnages are present. The average grade is only 43% Cr 2 O 3. The Great Dyke of Zimbabwe, traversing nearly the length of the country, is very similar and has been linked to the Bushveld in geological history. Other stratiform deposits occur in Madagascar and in the Odisha district of India. •
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Genesis of chromite deposits by dynamic upgrading of Fe …
We propose a new process that involves partial melting of Fe ± Ti oxide-rich rocks (oxide-facies iron formation or ferrogabbro) and conversion of fine-grained oxide to chromite by reaction with ...
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CHROMITE GEOLOGY OF ZIMBABWE AND RELATED …
Podiform known resources are off the Dyke in Shurugwi, Mashava, Valley, Nhema, Chirumanzu and Inyala(Mberengwa). They constitute approx. 3% of Zimbabwe's …
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The Chromite Deposits of the Great Dyke — Rhodesia (Zimbabwe …
The Chromite Deposits of the Great Dyke — Rhodesia (Zimbabwe) The Great Dyke is one of the most remarkable geological features known. Over five hundred kiolmetres long and rarely more than ten wide, it traverses the Archean Shield of Zimbabwe (Rhodesia) from north to south. Within layered ultrabasic rocks are several seams of chromite.
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The Chromite Deposits of the Great Dyke — …
Abstract. The Great Dyke is one of the most remarkable geological features known. Over five hundred kiolmetres long and rarely more than ten wide, it traverses the Archean Shield of Zimbabwe (Rhodesia) from north to south. Within layered ultrabasic rocks are …
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[PDF] MORPHOLOGY AND COMPOSITION OF CHROMITE IN …
Chromite grains in nearly fresh Archean komatiites from the late Archean Belingwe greenstone belt (ca. 2.7 Ga), in Zimbabwe, have diverse morphologies: skeletal and dendritic chromite is restricted to spinifex zones, whereas euhedral grains occur throughout the flows. Systematic differences in chromite compositions ate present …
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Ferrochrome Smelting In Zimbabwe
The Shurugwi deposit is one of the most important sources of metallurgical chromite in the world. These ore deposits are refractory and lumpy and are therefore perfect ferrochrome refiners. However, this type of ore is quickly depleting. Zimbabwe has total reserves of about 140 million tonnes with resources 1 ICDA Chromium mining
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Compositions and tectonic settings of chromite deposits …
Chromium ore deposits range in age from 3.5-billion year-old chromite in the Selukwe greenstone belt (Zimbabwe) to the ophiolite-hosted Miocene deposits of New Caledonia. They provide indications of the evolving earth's tectonic processes in oceanic and continental crust and mantle.Podiform orebodies are hosted in peridotites, mostly …
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Archean Komatiitic Sill-hosted Chromite Deposits in the Zimbabwe …
The Nickeliferous Late Archean Reliance Komatiitic Event in the Zimbabwe Craton––Magmatic Architecture, Physical Volcanology, and Ore Genesis. The widespread komatiitic Reliance lithostratigraphic unit of the late Archean Bulawayan Supergroup consists of many submarine flow fields directly or indirectly overlying the sedimentary …
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The Nature and Occurrence of Mineralisation in the
The MIC is host to the second most important chrysotile asbestos occurrence in Zimbabwe after the Zvishavane ultramafic complex (e.g., Laubscher, 1968; Wilson, 1968a,b). In addition, the MIC also hosts high-grade chromite and gold deposits (Wilson, 1968a,b; Wilson and Nutt, 1990; Blenkinsop, 1991; Prendergast, 2008).
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Tribute chromite mining and environmental
Tribute chromite mining and environmental management on the northern Great Dyke of Zimbabwe. Oliver Maponga, Oliver Maponga. Institute of Mining Research, University of Zimbabwe, Harare, Zimbabwe, Search for more papers by this author. Benjamin Ruzive, Benjamin Ruzive. Geological Survey, Harare, Zimbabwe.
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(PDF) Origin of the Mashava Igneous Complex, south central Zimbabwe …
Other greenstone belt associated chromite deposits PT from the Zimbabwe craton also plot in the komatiite field. On binary plots of the oxides CE aluminum versus chromium (Fig. 13a) and titanium versus chromium (Fig. 13b) which discriminate between the clans of stratiform and podiform chromites, however, MIC Al-chromite AC data falls in the ...
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Origin of the Mashava Igneous Complex, south central Zimbabwe: Evidence
In the Zimbabwe craton, chromite deposits have been documented from the Shurugwi Ultramafic Complex (Cotterill 1969(Cotterill, 1979Stowe 1987), the Great Dyke (Worst, 1958(Worst,, 1960Wilson ...
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Geochemistry of extremely modified chromites from the …
In the Zimbabwe craton, chromite deposits have been documented from the Shurugwi Ultramafic Complex (Cotterill 1969, 1979; Stowe 1987), ... The MIC, which is the other chrysotile asbestos-enriched body located east of ZUC, hosts chromite deposits that have been exploited in the recent past (Wilson 1968b; Bartholomew 1990b).
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Metallogeny and advances of chromite deposits
The formation of chromite is generally related to basic-ultrabasic rocks. However, the genetic mechanism of chromite deposit remains controversial. Deciphering the genesis of chromite deposit is of great significance for ore exploration. Methods. This review work summarizes the ore types, metallogenic age, ore body characteristics and …
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Formation of podiform chromitite deposits: implications from …
1. Introduction. The formation of podiform chromitite deposits has been discussed for many decades (e.g. Lago et al., 1982, Paktunc, 1990, Prichard and Lord, 1990, McElduff and Stumpfl, 1990, Zhou et al., 1994).A general consensus has emerged that such deposits form in the mantle section of ophiolites from SSZ environments …
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New geochronological constraints on the middle Archean …
The Zimbabwe Craton in southern Africa possesses typical Archean granitoid-greenstone belts that provide crucial information on the evolution of Archean continental crust (Wilson et al., 1978; Fig, 1). ... The chromite deposits of the Paleoarchean Bacuri Mafic-Ultramafic Complex in the Guyana Shield-Amazonian craton, Brazil, were recently ...
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Chromite: The only mineral ore of chromium metal
Podiform deposits are known in Kazakhstan, Russia, the Philippines, Zimbabwe, Cyprus, and Greece. The first discoveries of podiform chromite deposits were made near Baltimore, Maryland in the early 1800s. These deposits supplied nearly all of the world's chromite until about 1850. These deposits were small and are no longer in production.
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Orthomagmatic Mineral Deposits | SpringerLink
2.1 Chromite and Chromite-PGE Deposits. Chromite, the only ore mineral of the steel-refining metal chromium, can be concentrated to form large ore deposits of economic significance. Principally, two types of chromite deposits are distinguished: stratiform and. podiform chromite deposits. Stratiform chromite deposits (Bushveld-type)
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What is chromite (chrome) ore and where is it found
Chrome ore is found in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering. There are two main types of chromite deposits: stratiform deposits and podiform deposits. Zimbabwe is the only country that contains notable chromite …
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Chromite | Chromium Ore, Properties, Uses and Occurrence
Chromite – Mtoroshanga, Makonde District, Mashonaland West, Zimbabwe Chromite – Mtoroshanga, Makonde District, Mashonaland West, Zimbabwe. Chromite is an oxide mineral that an iron chromium oxide with formula: FeCr2O4. It is belonging to the spinel group. Chromite is the most important ore of chromium. Crystals are uncommon, …
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The Chrotnite Deposits of the Great Dyke -Rhodesia …
The Chrotnite Deposits of the Great Dyke - Rhodesia (Zitnbabwe) The Great Dyke is one of the most remarkable geological features known. Over five hundred kiolmetres long and rarely more than ten wide, it traverses the Archean Shield of Zimbabwe (Rhodesia) from north to south. Within layered ultrabasic rocks are several seams of chromite.
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New geochronological constraints on the middle …
The Shurugwe (Selukwe) greenstone belt of Zimbabwe (Stowe, 1968, 1974) is well known for its Archean chromite deposits (Stowe, 1994; Kusky, 1998; Sawada et …
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Archean Komatiitic Sill-hosted Chromite Deposits in the …
Lenticular chromite deposits of widely varying age, metamorphic grade and strain rate, as well as size, shape, and ore quality, are widespread in greenschist to …
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OVERVIEW OF ZIMBABWE'S MINERAL RESOURCE …
Chromite • Largest high grade chrome ore resources in the world in 11 narrow but persistent seams on the Great Dyke ... • Most so-called small mines are sitting on large deposits – nearly all of Zimbabwe's large mines were initially operated as small mines • Opportunities to re-examine the hundreds of small mines .
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CHROMITE–PLATINUM-GROUP ELEMENT MAGMATIC …
Magmatic chromite deposits (chromitites) are the only source of chromium for industrial use, and in some case they may carry subeconomic to economic amounts of ... Finland (0.5 Mt), Zimbabwe (0.5 Mt), and Brazil (0.2 Mt). 1.2. Platinum-Group Elements (PGE) Platinum was discovered by Julius Scaliger in 1735. Palladium, rhodium, osmium, and
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The Archean komatiite-related Inyala Chromitite, southern …
Abstract. The chromitites at the Inyala mine, Zimbabwe, form part of a layered intrusion enclosed within the Archean granulite facies gneisses of the north …
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Chromite from Zimbabwe
Chromite from Zimbabwe. Chromite Mutorashanga, Makonde District, Mashonaland West, Zimbabwe ... & Kojonen, K. (2003). Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe. Mineralium Deposita, 38(3), 327-343. ... J. C. (2006) Gemmology, geology and origin of the Sandawana emerald deposits, …
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Archean Komatiitic Sill-hosted Chromite Deposits in the Zimbabwe …
Lenticular chromite deposits of widely varying age, metamorphic grade and strain rate, as well as size, shape, and ore quality, are widespread in greenschist to amphibolite grade greenstonegneiss terrain in the south-central part of the Zimbabwe craton and in granulite grade equivalents in the Northern Marginal zone of the Limpopo belt in the far south.
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