Origin of podiform chromite deposits. The origin of podiform chromite deposits has long been a matter of debate. They are generally thought to have formed in the upper mantle by melt/rock interaction in SSZ environments (Zhou and Robinson, 1997, Ballhaus, 1998, Melcher et al., 1999, Buchl et al., 2004, Rollinson and Adetunji, 2013). …
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 now ...
chromite occurs within the Bushveld Igneous Complex (BIC) and is considered as stratiform chromite [1]. The BIC holds three quarters of the world's viable chromite ore deposits [2], and has an aerial 2extent of 65000 km with thickness of about 7 to 8 km [3]. The BIC consist of western, eastern and the northern limbs.
Podiform chromitite samples in the harzburgite zone show elevated Ir and Ru values, similar to the levels of enrichment of these platinum group elements (PGE) found …
The Indo-Burman Ranges and the Arakan Coastal Lowland. Andrew Mitchell, in Geological Belts, Plate Boundaries, and Mineral Deposits in Myanmar, 2018. 8.2 Webula Taung Chromite Occurrences and Copper–Nickel Anomalies. Chromitite occurrences in the 120 km 2 ultramafic body at Webula Taung (Fig. 11.6), the largest ultramafic body in the Indo …
This article reviews all the contributions made on genetic aspects of various Indian metallic ore deposits between the period 2020 and 2023. We cover ores of chromite, platinum group elements, gold, uranium-copper ores of Iron Oxide Copper Gold (IOCG) affiliation, rare earth metals (+ niobium + tantalum + yttrium), and lithium …
Please note that this article is from April 2014 – Stan Sudol. Located 500 kilometres northeast of Thunder Bay, the Ring of Fire mining camp contains billions worth of chromite — among the best deposits in the world — plus nickel, copper, platinum group elements, gold, zinc and vanadium.
These platinum deposits occur as thin, continuous layers of silicate or chromite rocks at the base of cyclic units and contain sulphides that are anomalously enriched in the platinum group ...
Whole rock platinum-group element (PGE) analyses of 36 stratigraphically controlled chromitite samples from the peridotite unit of the Acoje ophiolite sequence reveal the following: (a) Chromitites occurring within harzburgite of the mantle section (Group I chromitites) have abundances ranging from < 20 to 120 Ir, < 100 to 150 Ru, 0·7 to 17·8 …
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. ... (orthopyroxene and clinopyroxene), plagioclase, sulfides (pyrite, chalcopyrite, pyrrhotite, pentlandite, bornite), platinum group metals (mainly laurite, cooperite ...
Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a commercially …
This study provides a comprehensive literature review of the distribution, the platinum- group elements (PGE) composition, and mineral chemistry of chromitites associated with Mesozoic Tethyan ophiolites in the Mediterranean Basin. These suites outcrop in the northern Italian Apennines, the Balkans, Turkey, and Cyprus. Most …
These complexes can contain platinum-bearing ore deposits, particularly in association with chromite ores. Alluvial Deposits: In some cases, platinum is eroded from primary sources like layered intrusions and transported by rivers and streams. Over time, it can accumulate in alluvial deposits, often alongside other heavy minerals such as gold.
The present work reviews assemblages of detrital platinum-group minerals (PGM) in placers worldwide with the aim of identifying common and distinctive features …
Currently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, vanadium, tantalum and cobalt and industrial minerals phosphate, zirconium, vermiculite and gemstones. it is estimated that Africa is the repository of about 75% of the planet's total resources that remain ...
This paper reviews a database of about 1500 published and 1000 unpublished microprobe analyses of platinum-group minerals (PGM) from chromite deposits associated with ophiolites and Alaskan-type complexes of the Urals. Composition, texture, and paragenesis of unaltered PGM enclosed in fresh chromitite of the ophiolites …
Another major groups of deposits in the mafic layered complexes are platinum group elements and chrome deposits but unlike copper nickel massive sulfides they don't form as puddles on the floor of the intrusions they form in discrete layers well up in the magma chamber. The PGE's that's platinum palladium, rhodium with less …
Platinum Group Minerals (PGM) and chromite composition were compared in chromitites from Mesozoic ophiolites (Vourinos, Othrys, Troodos), Paleozoic ophiolites from the Ural (Kempirsai, Kraka, Habarny, Nurali, Kluchevskoy, Ray-Iz), and Precambrian ophiolites from the Egyptian Eastern Desert.
potential of chromite deposits depends mainly on the thickness, continuity, and grade of ore. The most important uses of chromium are in stainless steels, nonferrous alloys, and chromium plating. Chemical-grade chromium is widely used in chemicals and pigments. Chromium also is an important component in refractories. Many of the major ...
Chromite ((Mg, Fe++)(Cr, Al, Fe+++)2O4) is the only source for the metallic element chromium, which is used in the metallurgical, chemical, and refractory industries. Podiform chromite deposits are small magmatic chromite bodies formed in the ultramafic section of an ophiolite complex in the oceanic crust. These deposits have been found in …
Overview of Nigeria's Mineral Resources in the Context of …
WEBCurrently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, vanadium, tantalum …
This study presents a complete trace element data set of chromite from the world's largest podiform chromite deposit at Kempirsai, Kazakhstan, together with platinum group element (PGE) and Re-Os isotope compositions, to explore the potential of trace elements in the study of podiform chromite deposits.
Platinum-group elements (PGE) occur in ore-grade concentration in some of the chromite deposits related to the ultramafic section of the Acoje Block of the Zambales Ophiolite Complex. The deposits are of three types: Type 1 - associated with cumulate peridotites at the base of the crust; Type 2 - in dunite pods from the top 1 km of mantle harzburgite; …
Empirical evidence supports theoretical considerations that chromite and magnetite precipitation may be particularly conducive to trigger sulfide melt saturation, due to a pronounced decrease in FeO content of the magma. ... Deposits containing Ni, Cu and platinum-group elements (PGE) are usually associated with mafic and ultramafic rocks. …
Africa ranks first or second in the quantity of world reserves of platinum, gold, diamond, manganese, chromite, cobalt, vanadium, zirconium and phosphate rock, while it is a …
A fundamental problem in the genesis of all stratiform chromite deposits is how layers of massive to semi-massive chromite that are commonly up to 1 m thick (e.g., Bushveld [South Africa], Stillwater [Montana, USA]), less commonly up to 10 m thick (e.g., Inyala and Railway Block [Zimbabwe], Ipueira-Medrado [Brazil], Uitkomst [South Africa], Sukinda …
Chromium (Cr) ore refers to a natural mineral deposit that contains chromium in its raw form. Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, lustrous, and corrosion-resistant metal that is widely used in various industrial applications due to its unique properties.
CHROMITE–PLATINUM-GROUP ELEMENT MAGMATIC DEPOSITS Giorgio Garuti University of Modena and Reggio Emilia, Italy Keywords: chromite, platinum-group elements, magmatic ore deposits, geotectonic setting Contents 1. Introduction 1.1. Chromium 1.2. Platinum-Group Elements (PGE) 2. Chromium and PGE Geochemistry …
This paper examines the types of ore deposits in Nigeria. Ores of iron, tin-niobium-tantalum deposits, and precious metals in the Nigerian basement complex are predominantly associated with ... Currently, Africa is a world leader in the production of several high-value metals including gold, platinum, chromite, uranium, manganese, …
This book furnishes a detailed description of the deposits of metallic, non-metallic, solid energy, gemstones and industrial minerals in Nigeria with …
These intrusive complexes are the sole sources of platinum and chromite. (d) Nigeria's sedimentary basins basin, contain relatively thin (<5000 m) sequence of sediments that are not thick enough to accumulate large …
Ores of iron, tin-niobium-tantalum deposits, and precious metals in the Nigerian basement complex are predominantly associated with the metasediments (gneisses and schists). Associated with the older …
Solid Mineral Deposits and Mining in Nigeria: - A Sector in Transitional Change. M. A. Olade. Department of Geologic al Sciences. Achievers University, Owo, Nigeria. Corresponding author:...
New and recently published platinum-group element data of chromite-rich layers in the Bushveld Complex are evaluated. Chondrite-normalized platinum-group element plots of …