Do the Ubangui diamonds originate from a giant impact?

Details Do the Ubangui diamonds originate from a giant impact? Do the Ubangui diamonds originate from a giant impact?

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.532s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 532

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2

Africa, Diamonds, Magnetic Anomalies, Meteorite Collisions, Meteorite Craters, Carbon Isotopes, Chemical Analysis, Isotopic Enrichment, Meteoritic Composition

Scientific paper

Carbonado wa first recognized as a form of polycrystalline diamond as long ago as the 1840s, when it was discovered and mined as a placer mineral in Brazil. It is now known from a number of other sources, where it is colloquially known as 'carbons.' Common to all these samples is the fact that they occur in alluvial deposits far from primary diamond-bearing rocks such as kimberlite and lamporite. Several authors have suggested that carbonado might have a crustal origin. Recently, it has been proposed that a magnetic anomaly spread over 700,000 sq km of Central Africa might be interpreted as a crater formed by an impact that occurred in sedimentary rocks during Precambrian times; if authenticated this would be the largest impact feature recognized to date. Such a hypothesis makes the investigation of Ubangui diamonds and other carbonados worhtwhile. We considered isotopic systematics and other properties of a variety of intact Ubangui carbons. Because of their importance as grinding and polishing materials microcrystalline diamonds are usually crushed before marketing; the stones we obtained were not and showed a surface rind with a texture very reminiscent of a fusion crust. We have now made C isotopic measurements on five approximately centimeter-sized specimens. We have also begun to study N and its isotopes in carbonados. The results were comparable to data obtained for Brazilian carbonados. So far we have not detected any differences for N between the heavy C diamond and the rest of our samples.

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