射洪硅化木埋藏地地球化学特征及构造背景的指示  

Geochemical Characteristics as Indicators of Provenance,in Woodstone Locality,Shehong

作　　者：任志栋[1] 梁斌[1] 阚泽忠[2] 唐桢俊[1] 余光模[1] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]四川地质调查院,成都610081

出　　处：《四川地质学报》2011年第3期359-363,共5页Acta Geologica Sichuan

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)

摘　　要：对该硅化木化石埋藏地泥质岩的常量元素、微量元素和稀土元素特征进行了研究,并根据其地球化学特征讨论了物源区性质、物源区的风化特征以及构造背景。常量元素和稀土元素表明其物源区以长英质岩石为主;反映化学风化程度的CIA指数及成分成熟度的ICV指数都较低,表明物源区经历了弱化学风化作用,反映了晚侏罗世四川盆地北西部龙门山处于快速隆升阶段,构造活动较强烈。This paper deals with geochemical characteristics of major, minor, and rare elements of argillaceous rock where woodstone fossils in Shehong are buried and makes an approach to characteristics of weathering, and tectonic setting of the provenance consisting mainly of felsic rock. Lower CIA and ICV indices suggest weak chemical weathering and strong physical weathering characteristic of rapid uplifting in the Sichuan basin during Late Jurassic.

关 键 词：硅化木 地球化学特征 侏罗系 射洪 

分 类 号：P632[天文地球—地质矿产勘探]