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《中国科学院地质与地球物理研究所2001学术论文汇编(第二卷)》 2001年
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Rb-Sr chronological characteristics of Jurassic granitoid gravels in north margin of Dabie block,Central China

【摘要】:正Granitoid gravels are discovered from alluvial fan conglomerates,the base of Jurassic Fenghuangtai Formation (J_2~2),in the north margin of Dabie block and the south part of the Hefei Basin.These granitoid gravels make up 5%—10%of all gravels by volume percent For the four components,K-feldspar,biotite,amphibole and whole rock divided from two selected granitoid gravel samples,their Rb-Sr isotopes are measured,which gives two formation ages of granitoids:(428±20) Ma and(430±54) Ma,and means that the Early Paleozoic granitoid intrusive rocks once existed in the Dabie Mountain provenances of Jurassic.The granitoids occur in the tectonic setting of post-collision uplift according to lithogeochemical discriminant analysis.

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