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Inclusions in sublithospheric diamonds; glimpses of deep earth

Thomas Stachel, Gerhard P. Brey and Jeffrey W. Harris
Inclusions in sublithospheric diamonds; glimpses of deep earth
Elements (March 2005) 1 (2): 73-87

Abstract

Diamonds originate in the deep roots of ancient continental blocks (cratons) that extend into the diamond stability field beneath about 140 km. Over the last two decades, rare diamonds derived from even greater depths--the deep upper mantle, the transition zone (410-660 km), and the lower mantle--have been recognized. Inclusions in diamonds from the deep upper mantle and the transition zone document sources of basaltic composition, possibly related to subduction of old oceanic crust back into Earth's mantle. Diamonds from the lower mantle carry inclusions that largely confirm predictions of the composition and mineralogy of the deep mantle based on a "pyrolite" (primitive peridotitic) composition of silicate Earth. For some inclusions, however, the chemical evidence again points to a connection with subducting oceanic slabs, possibly ponding at the top of the lower mantle.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 1
Serial Issue: 2
Title: Inclusions in sublithospheric diamonds; glimpses of deep earth
Affiliation: University of Alberta, Eartha and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 73-87
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: 22
Accession Number: 2005-041373
Categories: General geophysicsSolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universitaet Frankfurt, CAN, CanadaUniversity of Glasgow, GBR, United Kingdom
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200515
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