Metasomatic hydration of the oeyama forearc peridotites: Tectonic implications

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In contrast to the widely recognized aspects of serpentinization, initial stages of hydration and tectonic processes of unserpentinized peridotites are still unclear, but have important implications for understanding the lithospheric architecture of supra-subduction zones. This study provides petrological evidence from the Oeyama ophiolite, SW Japan, of the effects of high-temperature metasomatic hydration immediately before the cooling and ductile deformation of forearc peridotites. Key findings in this study are: 1) complex association of high-temperature metasomatic minerals: tremolitic amphibole, cummingtonite, phlogopite, chlorite, olivine and orthopyroxene in veins and in mylonites; 2) the systematic variation in Si and Na. +. K contents of the tremolitic amphibole, corresponding to its mode of occurrence and mineral association; and 3) the presence of thin (

Original languageEnglish
Pages (from-to)346-360
Number of pages15
JournalLithos
Volume184-187
DOIs
Publication statusPublished - Jan 2014

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Amphibole Asbestos
Tectonics
hydration
Hydration
amphibole
Minerals
Association reactions
cummingtonite
tectonics
serpentinization
ductile deformation
phlogopite
mineral
orthopyroxene
ophiolite
subduction zone
chlorite
olivine
Cooling
cooling

Keywords

  • Exhumation
  • Forearc peridotite
  • Hydration
  • Metasomatism
  • Mylonite

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Metasomatic hydration of the oeyama forearc peridotites : Tectonic implications. / Nozaka, Toshio.

In: Lithos, Vol. 184-187, 01.2014, p. 346-360.

Research output: Contribution to journalArticle

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