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Strande diamonds; the mysterious origins of carbonado and framesite

Peter J. Heaney, Edward P. Vicenzi and Subarnarekha De
Strande diamonds; the mysterious origins of carbonado and framesite
Elements (March 2005) 1 (2): 85-89


Polycrystalline aggregates of diamond called carbonado and framesite have excited the attention of scientists because their crystallization histories are thought to depart markedly from established modes of diamond genesis. In contrast to kimberlitic diamonds, the geochemical signatures of carbonados are systematically crustal. Since the apparent age of carbonados is Archean ( approximately 3.2 Ga), a number of exotic formation theories have been invoked, including metamorphism of the earliest subducted lithosphere, radioactive transformation of mantle hydrocarbon, and meteorite impact on concentrated biomass. Unlike carbonados, framesites are known to originate in the mantle. They appear to have crystallized very rapidly, shortly before the eruption of the kimberlites that brought them to Earth's surface, suggesting that old cratonic materials can be remobilized after long-term storage in the lithosphere.

ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 1
Serial Issue: 2
Title: Strande diamonds; the mysterious origins of carbonado and framesite
Affiliation: Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Pages: 85-89
Published: 200503
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 50
Accession Number: 2005-041375
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Smithsonian Institution, USA, United States
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200515
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