自贡沙溪庙组地球化学特征及其对物源区和古风化的指示被引量：5

Geochemistry and implications for the source areas and weathering in the Shaximiao Formation,Zigong,Sichuan

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摘要本文对中侏罗统沙溪庙组泥质岩的主量元素、微量元素和稀土元素特征进行了研究,并讨论了物源区性质以及风化特征。物源区以长英质岩石为主,指示化学风化程度的CIA指数及成分成熟度的ICV指数,表明经历了低-中等的化学风化作用,反映了中侏罗世的半干旱气候环境。 The emphasis is placed upon the examination of the major elements, trace elements and REEs in the mudstone and approaches to the provenance and weathering in the Middle Jurassic Shaximiao Formation, Zigong, Sichuan. The study of major elements and REEs shows that the detritus are derived mostly from the felsic rocks in the source areas. The CIA （chemical index of alteration） and ICV （index of chemical variation） indexes suggest a low to moderate chemical weathering, implying that the study area was once in the semi-arid palaeoclimatic conditions during the Middle Jurassic.

作者王全伟梁斌阚泽忠

机构地区四川省地质调查院西南科技大学环境与资源学院

出处《沉积与特提斯地质》 CAS CSCD 2007年第4期17-21,共5页 Sedimentary Geology and Tethyan Geology

基金中国地质调查局"四川盆地中生代恐龙动物群研究"项目(200313000051)

关键词自贡中侏罗统地球化学四川盆地 Zigong Middle Jurassic geochemistry Sichuan Basin

分类号 P591 [天文地球—地球化学]

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