Petrogenesis of the Cenozoic Volcanic Rocks from the Northern Par of Qinghai-Xizang(Tibet) Plateau-中国期刊网

摘要 BasedonelectronprobeanalysesofthemineralsandbulkcompositionoftheCenozoicvolcanicrocksfromYumenandHohXillithodistricts,Qinghai-Xizangplateau,theformingconditionsincludingthetemperatureandpressureofthoserocksarestudiedinthispaperAccordingtothethermodynamiccalculationresultsofmineral-meltequilibrium,thedepthoftheasthenospheresuperface(about75-130km)forthenorthernpartoftheQinghai-XizangplateauduringtheCenozoicissuggested.Finally,thispaperindicatesthattheCenozoicvolcanicrocksinthenorthernpartoftheQinghai-Xizangplateaumainlyconsistofshoshoniteseries.Theirformingtemperatureis630-1039℃andformingpressureisbetween2.3-4.0GPa.Therockswereformedintheintracontinentalorogenicbelt,ofwhichtheprimarymagmawasoriginatedfromaparticularenrichmentuppermantleandaccretedcrust-mantlebeltofdirectlyfromasthenosphericsuperfaceasaresultofpartialofpyrolite.

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Petrogenesis of the Cenozoic Volcanic Rocks from the Northern Par of Qinghai-Xizang(Tibet) Plateau

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Petrogenesis of the Cenozoic Volcanic Rocks from the Northern Par of Qinghai-Xizang(Tibet) Plateau

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