学科分类
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4 个结果
  • 简介:Al-richmetapelitesfromtheMashankhondaliteseriesarecharacterizedbytheassemblageSpl+Grt+Sil+Crd+Bt+Pl(An72)+Kfs+Quartz+graphite.Largeamountsofspinel+quartzassemblagesoccurasinclusionsingarnetandprismaticsillimaniteintheAl-richmetapelitesoftheMashancomplex,NEChina.ThechemicalcompositionofspinelischaracterizedbyZn-rich(XZn=0.33–0.40.XZn=Zn/Zn+Mg+Fe*)(Fe*=Fe2++Fe3+)andFe3+rich(upto0.31p.f.u.).ThecharacteristicchemicalcompositionandthemineralassociationindicatedthattheformationofspinelandquartzassemblagemaybeduetothebreakdownofZn-richstaurolite.ThegeothermobarometersstudiesshowthatthepeaktemperatureoftheMashancomplexisaround820℃andthepeakpressuresis8.0kbar.TheMashancomplexshowsatypicalorogenstyleP-Tpath.

  • 标签: 孔兹岩系 尖晶石 石英石 泥质岩 Zn 东北