Petrogenesis and Geochemistry of Neogene Basalts in Eastern Anhui

(整期优先)网络出版时间:1995-04-14
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ThebasaltterrainoftheNeogeneHuangguoshanand.GuiwuFormationsofeasternAnhuiontheeastsideoftheTancheng-LujiangfaultbeltisoneofafewCenozoicbasaltterrainsineasternChinaforwhichdetailedgeochemicalstudyhasnotbeenconducted.Thispaperreportstheabundancesofmajorelementsandmorethan20traceelements(includingREE)of22samplesandtheNd,SrandPbisotopiccompositionsof11samplesfromtheeasternAnhuibasaltterrain,thusmoreorlesssystematicallyrevealingthegeochemicalcharacteristicsofthiscontinentalbasaltsuite.Thepaperdiscussestheoriginofthebasaltsuiteandthecharacterandprocessofitsmantlesource.ThebasaltsuitewasderivedfromaheterogeneouscontinentallithosphericmantlewithendmemberscharacteristicoftheEMI-typeoceanicbasaltmantle,whichwasaffectedbymantlemetasomatism(orenrichmentoftraceelements)andwascharacterizedbyamulti-stageevolutionunderopenconditions.