An updated classification scheme for mantle-derived garnet, for use by diamond explorers☆

Lithos (2004)

Herman Grütter John Gurney Andrew Menzies Ferdi Winter

352

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Keywords:

Xenolith

Topics:

Geological and Geochemical Analysis

High-pressure geophysics and materials

earthquake and tectonic studies

10.1016/j.lithos.2004.04.012

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KIMBERLITE MINERALS FROM VARGEM (MINAS GERAIS) AND REDONDAO (PIAUi) DIATREMES, BRAZIL; AND GARNET LHERZOL]TE XENOLITH FROM REDONDAO DIATREME

Revista Brasileira de Geociências (1977)

SVISERO DARCY P.MEYER HBNRY O. A.

Garnet, diopside and Mg-ilmenite have been analyzed from the Vargem diatreme, near Coromandel, State of Minas Gerais, and conlirmed to be comparable to similar minerals from kimberlites in South Africa, Siberia and the United States. Similar minerals occur downstream from the Vargem kimberlite in placer deposits in which diamond is found. The Redondão diatreme in southwest State of Piaul also contairs kimberlitic garnets as well as several xenoliths of crustal and mantle rocks. One xenolith, although extensively serpentinized, was originally a garnetJherzolite comparable in texture and garnet chemistry to those from kimberlites in Southern Africa.

Diatreme

Xenolith

Ilmenite

Diopside

Country rock

10.25249/0375-7536.1977113

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Citations (8)

Xenoliths of Eclogites with Diamonds from the Yubileinaya Kimberlite Pipe, Yakutia

Doklady Earth Sciences (2018)

Zdislav Spetsius И. Н. Богуш Alexander Ivanov

Xenolith

Corundum

Rutile

10.1134/s1028334x1801018x

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Citations (0)

Diamondiferous garnet harzburgites from the Finsch kimberlite, Northern Cape, South Africa

Contributions to Mineralogy and Petrology (1992)

Fanus Viljoen P. M. Swash M Otter D. J. Schulze P. J. LAWLESS

Xenolith

Peridotite

Mineral resource classification

Phlogopite

10.1007/bf00310887

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Citations (42)

Statistical Comparison between Pyroxenes from Kimberlites and Their Associated Xenoliths

The Journal of Geology (1977)

W. E. Stephens J. B. Dawson

Cluster analysis of 458 pyroxenes from kimberlites, associated xenoliths and diamonds has allowed recognition of 5 chemically distinct orthopyroxene groups and 10 distinct clinopyroxene groups from the $$TiO_{2}, Al_{2}O_{3}, Cr_{2}O_{3}$$, FeO, MgO, CaO, and $$Na_{2}O$$ contents. Names assigned to these groups convey their distinctive chemical features. Because many groups contain cases from both kimberlite and xenoliths, some kimberlite pyroxenes may derive from fragmented xenoliths. However from size alone, large discrete orthopyroxene crystals, discrete sub-calcic diopside nodules and low-Cr diopsides intergrown with ilmenite are apparently not xenolithic; nor are the minute diopside crystals growing in the kimberlite matrix. Pyroxene inclusions in diamonds and pyroxenes coexisting with diamond in eclogite and peridotite xenoliths range widely in chemical composition.

Xenolith

Diopside

Pyroxene

Ilmenite

Peridotite

Pyrope

10.1086/628317

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Citations (59)

Secondary alteration in eclogites from Kimberlite Pipes

American Mineralogist (1968)

Göran Berg