摘要
在秦岭造山带内，由前寒武纪基底岩层组成的隆起区和由显生宙地层构成的沉积盆地广泛共存．不同构造单元、不同地段的前寒武纪地层在Ｔｈ等微量元素含量和Ｓｍ／Ｎｄ比值特征上明显不同．通过对比不同时代的显生宙沉积地层与相关前寒武纪地层之间Ｔｈ含量和Ｓｍ／Ｎｄ比值，研究了各沉积小区碎屑沉积物随时代变化而发生的物源变化，由此讨论了南。
Many uplifted areas composed of Precambrian stratigraphic units and many Phanerozoic sedimentary basins coexist in the Qinling orogenic belt.The different Precambrian strata in various places and tectonic units show their own distinctive Th contents and Sm/Nd ratios.The source and its change with the time of clastic sediments in several major stratigraphic subunits are studied by comparing the Th content and Sm/Nd ratio values between the Phanerozoic sediments of different ages and the related Precambrian strata.The timing of the uplift of some Precambrian basements and of convergence between the North and South Qinling blocks is discussed.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1996年第5期464-468,共5页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
国家教委博士点基金
地矿部壳幔体系组成
物质交换及动力学开放研究实验室基金
关键词
沉积区
碎屑沉积物
地球化学
秦岭
造山带
uplifted area,sedimentary basin,clastic sediment,geochemistry,Qinling orogenic belt.
