Carbon recycled into deep Earth: Evidence from dolomite dissociation in subduction-zone rocks

Yongfeng Zhu, Yoshihide Ogasawara

Research output: Contribution to journalArticle

89 Citations (Scopus)

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 + O2, and majoritic garnet + MgO + H2O = 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.

Original languageEnglish
Pages (from-to)947-950
Number of pages4
JournalGeology
Volume30
Issue number10
DOIs
Publication statusPublished - 2002 Oct
Externally publishedYes

Keywords

  • Aragonite
  • Carbon recycling
  • Clinochlore
  • Diamond
  • Dolomite
  • Graphite
  • Subduction

ASJC Scopus subject areas

  • Geology

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