Spinel lherzolite xenoliths from the Premier kimberlite (Kaapvaal craton, South Africa): Nature and evolution of the shallow upper mantle beneath the Bushveld complex

Grégoire, Marilaure; Tinguely, C.; Bell, David R.; Roex, Anton P. le

doi:10.1016/j.lithos.2005.02.004

Cited by 67 publications

(34 citation statements)

References 69 publications

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“…3A-C and 9A and B). All olivine-rich peridotites in this study are strongly enriched in light and middle REE over HREE; the Tok suite differs in this regard from many other olivine-rich xenolith suites worldwide (South Africa, NW USA, Patagonia, Kerguelen and Canary Islands), which usually include LREE-depleted and/or poorly metasomatised refractory rocks (Mattielli et al, 1999;Grégoire et al, 2000;Neumann et al, 2002;Peslier et al, 2002;Rivalenti et al, 2004;Grégoire et al, 2005). Another distinctive feature of olivine-rich Tok peridotites is consistently high abundances of MREE (20-40 ppm Nd) and Sr (250-1000 ppm) in their cpx (Figs.…”

Section: Role Of Partial Melting and Metasomatism In Trace Element Comentioning

confidence: 75%

Trace element distribution in peridotite xenoliths from Tok, SE Siberian craton: A record of pervasive, multi-stage metasomatism in shallow refractory mantle

Ionov¹,

Chazot²,

Chauvel³

et al. 2006

Geochimica et Cosmochimica Acta

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Section: Role Of Partial Melting and Metasomatism In Trace Element Comentioning

confidence: 75%

Trace element distribution in peridotite xenoliths from Tok, SE Siberian craton: A record of pervasive, multi-stage metasomatism in shallow refractory mantle

Ionov¹,

Chazot²,

Chauvel³

et al. 2006

Geochimica et Cosmochimica Acta

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“…Gurney and Harte, 1980;Harte, 1983;Menzies et al, 1987;Hoal, 2003;Grégoire et al, 2005). This is seen more clearly in mantle xenoliths of the Premier kimberlite pipe that have experienced metasomatism by basaltic melts related to the Bushveld intrusion (Hoal, 2003;Grégoire et al, 2005). Hence, this melt has high Ca, Al, Ti and Fe, but lower SiO 2 contents compared to the melt that formed orthopyroxene in the websterites.…”

Section: Clinopyroxene Garnet and Rutile Crystallizationmentioning

confidence: 99%

Contrasting types of metasomatism in dunite, wehrlite and websterite xenoliths from Kimberley, South Africa

Rehfeldt

Foley

Jacob

et al. 2008

Geochimica et Cosmochimica Acta

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“…Modern fore arc-mantle peridotite close to the Mariana type (Ohara et al, 2002) olivines have higher Fe # values 0.07e0.08. Ancient Sp peridotites from the Premier pipe in South Africa reveal also rather elevated Fe # Ol (0.09e0.08) (Grégoire et al, 2005).…”

Section: Compositional Features Of the Mantle Sequences In Different mentioning

confidence: 99%

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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a b s t r a c tMantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle (SCLM). Pressure-temperature (PT) reconstructions using monomineral thermobarometry for 5 phases show division of the SCLM beneath the Kharamai field into 6 units: pyroxenitic Fe-rich (1e2 GPa) and Mg-rich (2e3 GPa) layers; middle with two levels of Gar-Sp pyroxenites at w3 and 4e5 GPa; Gar-duniteeharzburgites w4.5e6.5 GPa subjected to Ilm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield (Ary-Mastakh, Dyuken and Kuranakh fields) mantle lithosphere is composed of three large units divided into two parts: upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe # Gar clusters for garnets and omphacites illustrate the differences between SCLM of these localities. Differences of Triassic SCLM from Devonian SCLM are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLM base to 5.0 GPa.Kharamai mantle clinopyroxenes represent three geochemical types: (1) harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; (2) lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; (3) eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less inclined REE patterns with HMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and Sr, similar to those in ophiolitic harzburgites. The PT diagrams for the mantle sections show high temperature gradients in the uppermost SCLM accompanied by an increase of P-Fe # Ol upward and slightly reduced thickness of the mantle keel of the Siberian craton, resulting from the influence of the PermianeTriassic superplume, but with no signs of delamination.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Spinel lherzolite xenoliths from the Premier kimberlite (Kaapvaal craton, South Africa): Nature and evolution of the shallow upper mantle beneath the Bushveld complex

Cited by 67 publications

References 69 publications

Trace element distribution in peridotite xenoliths from Tok, SE Siberian craton: A record of pervasive, multi-stage metasomatism in shallow refractory mantle

Trace element distribution in peridotite xenoliths from Tok, SE Siberian craton: A record of pervasive, multi-stage metasomatism in shallow refractory mantle

Contrasting types of metasomatism in dunite, wehrlite and websterite xenoliths from Kimberley, South Africa

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

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