Melt Depletion and Enrichment beneath the Western Kaapvaal Craton: Evidence from Finsch Peridotite Xenoliths

Gibson, S. A.; Malarkey, J.; Day, Jason

doi:10.1093/petrology/egn048

Cited by 75 publications

(55 citation statements)

References 98 publications

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“…Arrow indicates the trend of a melt formed in the presence of residual rutile in Bulk Silicate Earth-like (BSE) material. Note that Garledinne lamproites exclude crustal contamination and are distinct in their composition to the data of KLF and other Cuddapah lamproites but are strikingly similar to that of RLF subsequently enriched mantle source, similar to that found in garnet peridotite nodules (Beard et al 2007;Gibson et al 2008) and commonly assumed as the source region of lamproites and kimberlites (e.g. Mitchell and Bergman 1991;Tainton and McKenzie 1994;Becker and Le Roex 2006), is also inferred for the Garledinne lamproites.…”

Section: Mantle Source Regionssupporting

confidence: 63%

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

et al. 2015

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We report mineral chemistry and whole-rock major and trace-element geochemistry for a recent find of Mesoproterozoic (~1.4 Ga) lamproites from the Garledinne (Banganapalle) cluster, south-western part of the PaleoMesoproterozoic Cuddapah Basin, southern India. The Garledinne lamproites occur as WNW-ESE-trending dykes that have undergone varying degree of pervasive silicification and carbonate alteration. Nevertheless, their overall texture and relict mineralogy remain intact and provide important insights into the nature of their magmas. The lamproite dykes have porphyritic to weakly porphyritic textures comprising pseudomorphed olivine macrocrysts and microphenocrysts, titanian phlogopite microphenocrysts, spinel having a compositional range from chromite to rarely magnesiochromite, Srrich apatite and niobian rutile. The Garledinne and other Cuddapah Basin lamproites (Chelima and Zangamarajupalle) collectively lack sanidine, clinopyroxene, potassic richterite, and titanite and are thus mineralogically distinct from the nearby Mesoproterozoic lamproites (Krishna and Ramadugu) in the Eastern Dharwar Craton, southern India. The strong correlation between various major and trace elements coupled with high abundances of incompatible and compatible trace elements imply that alteration and crustal contamination have had a limited effect on the whole-rock geochemistry (apart from K 2 O and CaO) of the Garledinne lamproites and that olivine fractionation played an important role in their evolution. The Garledinne lamproites represent small-degree partial melts derived from a refractory (previously melt extracted) peridotitic mantle source that was subsequently metasomatised (enriched) by carbonate-rich fluids/melts within the garnet stability field. The involvement of multiple reservoirs (sub-continental lithospheric mantle and asthenosphere) has been inferred in their genesis. The emplacement of the Garledinne lamproites is linked to extensional events, across the various Indian cratons, related to the break-up of the Proterozoic supercontinent of Columbia.

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Section: Mantle Source Regionssupporting

confidence: 63%

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

et al. 2015

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“…Summary discussions are found for example in Stachel et al (1998), Pearson and Wittig (2008) and Gibson et al (2008). Shu et al (2013) summarized and extended the arguments for a low pressure origin.…”

Section: The Melting Regime and Composition Of Residual Cratonic Perimentioning

confidence: 82%

“…Boyd and Mertzman, 1987 and more recent Simon et al, 2007 andGibson et al, 2008). These processes are expressed in high abundances of both incompatible and compatible trace elements, i.e.…”

Section: Introductionmentioning

confidence: 99%

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Shu

Brey

2015

Earth and Planetary Science Letters

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“…Within cratoic roots the high-Cr spinel residue reacted with pyroxene to create high-Cr garnet and olivine (Johnson et al, 1990;Gibson et al, 2008). The extreme melt depletion of the lithospheric mantle formed harzburgite and probably dunite residues (Bernstein et al, 2007;Pearson and Wittig, 2008).…”

Section: Producing Cr-rich Subcalcic Garnetmentioning

confidence: 99%

Origins of subcalcic garnets and their relation to diamond forming fluids—Case studies from Ekati (NWT-Canada) and Murowa (Zimbabwe)

Klein-BenDavid

Pearson

2009

Geochimica et Cosmochimica Acta

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Melt Depletion and Enrichment beneath the Western Kaapvaal Craton: Evidence from Finsch Peridotite Xenoliths

Cited by 75 publications

References 98 publications

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south-western Cuddapah Basin, southern India

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Origins of subcalcic garnets and their relation to diamond forming fluids—Case studies from Ekati (NWT-Canada) and Murowa (Zimbabwe)

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