CO2-metasomatism of a metabasite block in a serpentine melange from the Nishisonogi metamorphic rocks, southwest Japan

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書誌事項

公開日
1990-01
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1007/bf00310644
公開者
Springer Science and Business Media LLC

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説明

Local fluid migration through a serpentine melange caused successive carbonation of a metabasite block (about 80 meter in diameter) during the uplift stage of the glaucophanitic metamorphic rocks, the Nishisonogi metamorphics, southwest Japan. The block shows a zonal sequence as follows. Zone 1: original greenschist (Am+Ep+ Chl+Ab+Sph+Qtz). Zone 2: epidote disappears by the reaction Ep+Am+CO2+H2O=Chl+Cc+Qtz. Zone 3: balc appears by the reaction Am+CO2+H2O=Ta+Cc+ Qtz. Zone 4:sphene breakdowns by the reaction Sph+ CO2=Rt+Cc+Qtz. Zone 5: amphibole disappears by the two simultaneous reactions, Am+CO2=Do+Ta+Qtz and Ta+Cc+CO2=Do+Qtz+H2O. Zone 7: albite is replaced by chlorite, calcite, dolomite and quartz, and the assemblage of Do+Cc+Chl+Rt+Qtz is stable. Analyses of phase relations indicate an introduction of CO2-rich fluid into the greenschist body during regional metamorphism. The CO2-rich fluid may have formed by devolatilization reactions between serpentinite and graphite-bearing metasediments. The fluid migrated within the melange through a channelized pathway and into the greenschist body from a deeper part of the melange.

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