The Shurugwe (Selukwe) greenstone belt of Zimbabwe (Stowe, 1968, 1974) is well known for its Archean chromite deposits (Stowe, 1994; Kusky, 1998; Sawada et …

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.

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 …

Stratiform chromite deposits are expressed as massive chromitite (greater than 90 percent chromite) bodies or seams of disseminated chromite in large, unmetamorphosed, repetitively layered mafic-ultramafic intrusions that were emplaced in stable cratonic settings or during rift-related events (Lee, 1996; Naslund and McBirney, 1996; Cawthorn and ...

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 …

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 …

Karoo. the Permian-Triassic-Jurassic sedimentary and basaltic rocks of the Karoo Supergroup. Huge resources of good quality coal and CBM. Outline of potential of major …

Economic chromite deposits typically formed during three main periods: (1) the Stillwater Complex (Montana, United States) and River Sill (southeastern Manitoba, Canada) approximately 2.7 billion years ago (Ga); (2) the Great Dyke (Zimbabwe), the Kemi intrusion (Finland), and the Burakovsky layered intrusion (Russia) at approximately 2.5 ...

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, Wilson, 1968b).In addition, the MIC also hosts high-grade chromite and gold deposits (Wilson, 1968a, Wilson, 1968b; Wilson and Nutt, 1990; Blenkinsop, 1991; …

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, …

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.

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 …

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)

Growth of subcontinental lithospheric mantle beneath Zimbabwe started at or before 3.8 Ga: Re–Os study on chromites. ... 1987, Stowe, 1994, Rollinson, 1997). Similar chromite deposits are also found within Archean greenstone belts in the Indian shield. Examples include those of the Singhbhum Craton in eastern India, and in the …

A new descriptive stratiform chromite deposit model was prepared which will provide a framework for understanding the characteristics of stratiform chromite deposits worldwide. Previous stratiform chromite deposit models developed by the U.S. Geological Survey (USGS) have been referred to as Bushveld chromium, because the Bushveld Complex in …

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 ...

In another chromite from a podiform deposit the heating curve exhibits a broad peak at about 450, which is normally taken to indicate the formation of magnetite. However the cooling curve is typical of a paramagnetic substance and does not indicate the formation of magnetite as there is no evidence for a Curie point at a temperature of 575 …

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. •

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 …

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 …

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. …

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 ...

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 …

Abstract. The chromitites at the Inyala mine, Zimbabwe, form part of a layered intrusion enclosed within the Archean granulite facies gneisses of the north …

Business Correspondent Chrome mining in Zimbabwe has seen significant growth in recent years, spurred by the country's vast chromite deposits and the increasing demand for chrome worldwide. The ...

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.

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

Chromite Chromite from Zimbabwe: Chromite from Shurugwi, Zimbabwe. Specimen is approximately 4 inches (10 centimeters) across. PODIFORM DEPOSITS. Podiform deposits are large slabs of oceanic lithosphere that have been thrust up onto a continental plate. These slabs of rock, also known as "ophiolites," can contain significant …

Stratiform chromite deposits are found throughout the world, but the chromitite seams of the Bushveld Complex, South Africa, are the largest and most intensely researched. The chromite ore is located primarily in …

Podiform known resources are off the Dyke in Shurugwi, Mashava, Valley, Nhema, Chirumanzu and Inyala(Mberengwa). They constitute approx. 3% of Zimbabwe's …

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 ...