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grant cawthorn bushveld complexo

  • RELATIONSHIP BETWEEN PGE AND PGM IN THE

    R Grant Cawthorn § 1 Department of Geology University of the Witwatersrand PO Wits 2050 South Africa are summarized for all the mines exploiting the Merensky Reef on both western and eastern limbs of the Bushveld Complex in South Africa Grades for the mined reef interval are uniform over 100 km of strike length at 5–7 g/t

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  • Emplacement and Crystallization Time for the Bushveld

    1998 9 1 Introduction The Bushveld Complex BC is a large layered intrusion emplaced into a stable cratonic setting It has been considered an intrusive equivalent of a continental flood basalt province and inferred to be related to a mantle plume Hatton 1995 .The duration of continental flood basaltic magmatism may be of the order of several million years.

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  • Grant Cawthorn The Conversation

    Grant Cawthorn’s profile on The Conversation Main fields of specialization Origin of mafic igneous intrusive rocks and their mineral deposits.

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  • The extension of the western limb Bushveld Complex

    2018 7 5 Cawthorn R.G 1988 Discussion of metamorphic evidence for early post Bushveld sill in the Penge Iron Formation Transvaal Sequence Eastern Transvaal South African Journal of Geology 91 134 136.Google Scholar

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  • Cooling of the Bushveld Complex South Africa

    Igneous rocks record the direction of the Earth’s magnetic field as they cool through their Curie temperature The mafic magmas of the 8 km thick Bushveld Complex of South Africa took 65 k.y to be emplaced 180 k.y to solidify to 900 C and a further 500 k.y for the entire intrusion to cool below 580 C the Curie temperature of magnetite.

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    Origin of the Merensky Pegmatitic Pyroxenite Bushveld

    2020 3 26 Origin of the Merensky Pegmatitic Pyroxenite Bushveld Complex R Grant Cawthorn and Kevin D Boerst Department of Geology University of the Witwatersrand PO Wits 2050 South Africa e mail 065rgc cosmos.wits.ac The feldspathic pegmatitic pyroxenite associated with the platinum mineralization of the Merensky Reef Bushveld Complex has been

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  • Parental magma to the Bushveld Complex

    The Bushveld Complex of South Africa is a large layered intrusive suite of cumulate rocks for which the parental magma is not directly obtainable However we report here indirect evidence from a

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  • Grant Cawthorn

    Grant Cawthorn studies Rare Earth High Temperature and Experimental Data.

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  • Immiscible iron

    2016 6 1 This has also implications for the formation of evolved lavas quartz monzonitic and rhyolitic compositions which are closely associated to the Bushveld Mathez et al 2013 Cawthorn 2013b 2 The Upper Zone of the Bushveld Complex The Bushveld Complex South Africa includes a 7 km thick mafic cumulate sequence emplaced in three limbs.

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  • PDF Vertical Chemical Gradients in a Single Grain of

    R Grant Cawthorn T.S McCarthy The distribution of the incompatible elements Rb Sr Zr Y and Nb in a drillcore from the uppermost 500 m of the complex is described and related to

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  • Parental magma to the Bushveld Complex

    The Bushveld Complex of South Africa is a large layered intrusive suite of cumulate rocks for which the parental magma is not directly obtainable However we report here indirect evidence from a

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  • The Bushveld Complex South Africa

    2015 5 19 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

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  • Emplacement and Crystallization Time for the Bushveld

    2020 3 26 Origin of the Merensky Pegmatitic Pyroxenite Bushveld Complex R Grant Cawthorn and Kevin D Boerst Department of Geology University of the Witwatersrand PO Wits 2050 South Africa e mail 065rgc cosmos.wits.ac The feldspathic pegmatitic pyroxenite associated with the platinum mineralization of the Merensky Reef Bushveld Complex has been

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  • Developments in Petrology

    Edited by Richard Grant Cawthorn Volume 15 Pages 1 531 1996 Download full volume Previous volume Next volume Actions for selected chapters Select all / Deselect all A Review of Mineralization in the Bushveld Complex and some other Layered Intrusions C.A Lee Pages 103 145 Download PDF Chapter preview.

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    Emplacement and Crystallization Time for the Bushveld

    2008 2 24 journal of petrology volume 39 number 9 pages 1669–1687 1998 emplacement and crystallization time for the bushveld complex r grant cawthorn1 and feodor walraven2 1department of geology university of the witwatersrand po wits 2050 south africa 2924 keyter street daspoort 0082 south africa received july 20 1997 revised typescript accepted april 16 1998

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  • R

    R Grant Cawthorn F Johan Kruger A major geochemical hiatus occurs in the Bushveld Complex at the level of the platiniferous Merensky reef close to the Critical Main zone boundary.

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  • Cooling of the Bushveld Complex South Africa

    Igneous rocks record the direction of the Earth’s magnetic field as they cool through their Curie temperature The mafic magmas of the 8 km thick Bushveld Complex of South Africa took 65 k.y to be emplaced 180 k.y to solidify to 900 C and a further 500 k.y for the entire intrusion to cool below 580 C the Curie temperature of magnetite.

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    The Platinum Group Element Deposits of the Bushveld

    By R Grant Cawthorn School of Geosciences University of the Witwatersrand Private Bag 3 Johannesburg 2050 South Africa E mmail grant.cawthorn wits.ac 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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    R

    2020 11 1 Bushveld Complex R Grant Cawthorn Recent exploration in the Transvaal indicates possible new pia tin urn deposits but they are not likely to be payable jor some time South Africa and Bophuthatswana produce well over 50070 of the world s platinum and hold an even greater proportion of the world s known reserves Furthermore until

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