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 : 000775 ( Main/Exploration ); précédent : 000774; suivant : 000776Contrasting 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 [Afrique du Sud] ; D. J. Schulze ; A. G. Quadling [Afrique du Sud]Source :
- Journal of Petrology [ 0022-3530 ] ; 2005-10.
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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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Petrology</title><idno type="ISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2005-10">2005-10</date><biblScope unit="volume">46</biblScope><biblScope unit="issue">10</biblScope><biblScope unit="page" from="2059">2059</biblScope><biblScope unit="page" to="2090">2090</biblScope></imprint><idno type="ISSN">0022-3530</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3530</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>REE</term><term>diamonds</term><term>eclogite xenoliths</term><term>isotopic composition</term><term>trace elements</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>Afrique du Sud</li></country></list><tree><noCountry><name sortKey="Schulze, D J" sort="Schulze, D J" uniqKey="Schulze D" first="D. J." last="Schulze">D. J. Schulze</name></noCountry><country name="Afrique du Sud"><noRegion><name sortKey="Viljoen, K S" sort="Viljoen, K S" uniqKey="Viljoen K" first="K. S." last="Viljoen">K. S. Viljoen</name></noRegion><name sortKey="Quadling, A G" sort="Quadling, A G" uniqKey="Quadling A" first="A. G." last="Quadling">A. G. Quadling</name><name sortKey="Viljoen, K S" sort="Viljoen, K S" uniqKey="Viljoen K" first="K. S." last="Viljoen">K. S. Viljoen</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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