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Carbon recycled into deep Earth; evidence from dolomite dissociation in subduction-zone rocks

Zhu Yongfeng and Yoshihide Ogasawara
Carbon recycled into deep Earth; evidence from dolomite dissociation in subduction-zone rocks
Geology (Boulder) (October 2002) 30 (10): 947-950

Abstract

The dolomite-dissociation textures documented here in rocks from the Kokchetav ultrahigh-pressure massif suggest that the experimentally expected dolomite dissociation happened in the subducted slabs represented by these rocks. Two reactions, magnesite = C + MgO + O (sub 2) , and majoritic garnet + MgO + H (sub 2) O = garnet + clinochlore, recorded in carbonate inclusions and the host majoritic garnet are responsible for generation of graphite and clinochlore during the exhumation. The dolomite dissociation indicates that carbonate materials were subducted to depths of >250 km below Earth's surface. Such deep subduction evidently brings abundant carbon and carbonate into deep Earth.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 10
Title: Carbon recycled into deep Earth; evidence from dolomite dissociation in subduction-zone rocks
Affiliation: Peking University, Institute of Geochemistry, Beijing, China
Pages: 947-950
Published: 200210
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2002-075320
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N52°45'00" - N53°15'00", E68°30'00" - E70°19'60"
Secondary Affiliation: Waseda University, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200223
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