Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa
Identifieur interne : 001525 ( Istex/Corpus ); précédent : 001524; suivant : 001526Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa
Auteurs : K. S. Viljoen ; D. J. Schulze ; A. G. QuadlingSource :
- Journal of Petrology [ 0022-3530 ] ; 2005-10.
English descriptors
- KwdEn :
Abstract
Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.
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DOI: 10.1093/petrology/egi047
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<front><div type="abstract" xml:lang="en">Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</div>
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<notesStmt><note>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: fanus.viljoen@debeersgroup.com</note>
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Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: <ext-link xlink:href="fanus.viljoen@debeersgroup.com" ext-link-type="email">fanus.viljoen@debeersgroup.com</ext-link>
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<volume>46</volume>
<issue>10</issue>
<fpage>2059</fpage>
<lpage>2090</lpage>
<history><date date-type="accepted"><day>4</day>
<month>4</month>
<year>2005</year>
</date>
<date date-type="received"><day>15</day>
<month>3</month>
<year>2004</year>
</date>
</history>
<permissions><copyright-statement>© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org</copyright-statement>
<copyright-year>2005</copyright-year>
</permissions>
<abstract xml:lang="en"><p>Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme <sup>87</sup>
Sr/<sup>86</sup>
Sr (∼0·915) and extreme <sup>143</sup>
Nd/<sup>144</sup>
Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</p>
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<mods version="3.6"><titleInfo lang="en"><title>Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</title>
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<titleInfo type="alternative" lang="en" contentType="CDATA"><title>Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</title>
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<name type="personal"><namePart type="given">K. S.</namePart>
<namePart type="family">VILJOEN</namePart>
<affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</affiliation>
<affiliation>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</affiliation>
<affiliation>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315.</affiliation>
<affiliation>E-mail: fanus.viljoen@debeersgroup.com</affiliation>
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<name type="personal"><namePart type="given">D. J.</namePart>
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<affiliation>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</affiliation>
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<name type="personal"><namePart type="given">A. G.</namePart>
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<abstract lang="en">Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</abstract>
<note type="author-notes">*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: fanus.viljoen@debeersgroup.com</note>
<subject lang="en"><genre>KWD</genre>
<topic>eclogite xenoliths</topic>
<topic>trace elements</topic>
<topic>REE</topic>
<topic>isotopic composition</topic>
<topic>diamonds</topic>
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<identifier type="ISSN">0022-3530</identifier>
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