Immiscible iron
201661· Abstract The Bushveld Complex (South Africa) is the largest layered intrusion on Earth and plays a considerable role in our understanding of magmatic differentiation and ore-forming processes. In this study, we present new geochemical data for apatite-hosted multiphase inclusions in gabbroic cumulates from the Bushveld Upper Zone.
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Cooling of the Bushveld Complex, South Africa: Implications …
201361· Cooling of the Bushveld Complex, South Africa: Implications for paleomagnetic reversals R. Grant Cawthorn; Susan J. Webb Author and Article Information
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Chapter 12 The Bushveld Complex, South Africa
R. Grant Cawthorn Abstract The mafic rocks of the Bushveld Complex, South Africa, were emplaced into a stable cratonic shield some 2.06 b.y. ago, and have remained remarkably well preserved from deformation, metamorphism and low temperature alteration, at least partly by its isostatic impact on the entire crustal thickness. The generation and emplacement of possibly 1 …
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(PDF) The Platinum Group Element Deposits of the …
2010101· Importantly, the Bushveld Complex contains >80% of the Earth''s known chromium resources (Cawthorn, 2010) which are hosted within …
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(PDF) The Merensky Reef, Bushveld Complex: …
200647· The Bushveld Complex in the Republic of South Africa (ZAF) is the largest known layered igneous intrusion on earth and contains the world''s …
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The geochemistry of vanadiferous magnetite in the bushveld …
Recently, our interest has been focused on the upper zone of the Rustenburg Layered Suite of the Bushveld Complex with its abundant thick layers of mono- minerallic magnetite (Cawthorn and Mc Carthy, 1980 and 1981).
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Lateral variations in plagioclase compositions, Main Zone, Bushveld
12· Many layered intrusions are considered to have been repeatedly inflated by magma additions, but rates of magma mixing relative to rates of layer accumulation are difficult to model. The nature of magma recharge through the interval including the Pyroxenite Marker (PM), Main Zone, Bushveld Complex, South Africa, is examined with regard to such processes. The …
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Vertical chemical gradients ina single rain of magnetite from the Bushveld Complex, South Africa R.GRANT CAWTHORN, T. S. McCARTHY, AND G. DAVIES
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Geomorphological Evolution 5 of the Pilanesberg
Abstract The geomorphological evolution of the Pilanesberg Complex, an alkaline igneous body emplaced around 1,250 million years ago and subsequently exhumed by erosion, reflects the interplay of
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Cawthorn, R. and Molyneux, T. (1986) Vanadiferous Magnetite …
Cawthorn, R. and Molyneux, T. (1986) Vanadiferous Magnetite Deposits of the Bushveld Complex. Mineral Deposits of Southern Africa, 2, 1251-1266.
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Formation of PC
as crosses) of the Bushveld Complex, with the associated granites (shown by plus signs) occurring to the east. An alternative interpretation of the shape and …
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Re-evaluation of magma compositions and processes in the uppermost Cri Zone icalof the Bushveld Complex R.GRANT CAWTHORN
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The geochemistry of vanadiferous magnetite in the bushveld complex
Detailed trace-element analyses of pure magnetite from four continuous borehole intersections through the main magnetitite layer from the upper zone of the Rustenburg Layered Suite of the Bushveld Complex are presented. One section has been analysed at one centimetre intervals. Rapid depletion of Cr occurs over short, vertical sequences near the base of the layer, which …
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Rare earth element abundances in apatite in the Bushveld Complex…
201421· Rare earth element abundances in apatite in the Bushveld Complex—A consequence of the trapped liquid shift effect: REPLY R. Grant Cawthorn
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Massive pyroxene compositional oscillations on a metre scale …
202031· In the Main Zone of the Bushveld Complex, South Africa, there is an horizon known as the Pyroxenite Marker that shows major reversals in mineral compositions, demonstrating significant addition of
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The Platinum Group Element Deposits of the Bushve/d Complex in South Africa doi:lO. 1 595/1471 0671 By R. Grant Cawthorn School of Geosciences, University of the Witwatersrand Private Bag 3
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Developments in Petrology
The Bushveld Complex Article December 1996 · 133 Reads H.V. Eales · R. Grant Cawthorn
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Grant Cawthorn
Grant Cawthorn’s profile on The ConversationMain fields of specialization: Origin of mafic igneous intrusive rocks and their mineral deposits. Main research …
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The geochemistry of vanadiferous magnetite in the bushveld …
Detailed trace-element analyses of pure magnetite from four continuous borehole intersections through the main magnetitite layer from the upper zone of the Rustenburg Layered Suite of the …
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Origin of the Pegmatitic Pyroxenite in the Merensky Unit, Bushveld …
2006331· The genesis of the pegmatitic pyroxenite that often forms the base of the Merensky Unit in the Bushveld Complex is re-examined. Large (>1 cm) orthopyroxene grains contain tricuspidate inclusions
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The Platinum Group Element Deposits of the Bushveld …
There are enough platinum group element deposits in the Bushveld Complex in South Africa to supply world demands for many decades or even a century using current mining techniques. …
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(PDF) The Merensky Unit on Lonplats’ Mines, Bushveld Complex.
The Merensky Reef and the underlying Upper Group 2 chromitite layer, in the Critical Zone of the Bushveld Complex, host much of the world’s platinum-group element (PGE) mineralization.
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Mineral compositions show that fractionation was unidirectional to the extreme top of the Bushveld Complex (Eales & Cawthorn, 1996; Ashwal et al., 2005; Tegner et al., 2006).
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fr/9/grant cawthorn bushveld complex.md at main
R Grant Cawthorn,Identification of Anorthite enriched Plagioclase Antecrysts in the Bushveld Complex,South Africa,Journal of Petrology,Volume 60.Geological map of the Bushveld …
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Evidence for the incremental assembly of the Pyroxenite Marker
21· There is mineralogical, chemical and isotopic evidence that the layered mafic-ultramafic sequence of the Bushveld Complex, the Rustenburg Layered Suite (RLS), was formed through at least 4 major pulses of replenishing magma (e.g., Eales, 2002; Kruger, 2005; Cawthorn, 2015).
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The use of phosphorus contents in yielding estimates of the …
75· Phosphorus contents in cumulus rocks occurring close to the level of apatite appearance in the basic rocks of the Bushveld Complex, South Africa, provide a method of calculating the proportion of intercumulus component in these rocks. Previous experimental studies have accurately constrained the phosphorus content of magmas when apatite …
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(PDF) The Merensky Reef, Bushveld Complex: …
200647· The Bushveld Complex in the Republic of South Africa (ZAF) is the largest known layered igneous intrusion on earth and contains the world''s …
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