2013•Dizhi tongbaoRequires access

The provenance of Lower Cretaceous basin in the Qilian Mountain-Beishan area: Evidence from paleocurrents, gravels, sandstone compositions and detrital zircon geochronology

Peng Zuo, Yongqing Liu, Hongwei Kuang, Jun Chen, Xue Pei-lin, XU Jia-lin, Hai Liu, Yanxue Liu, Huan Xu

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Abstract

物源分析是判断古侵蚀区位置和恢复盆山格局特征的重要方法之一.应用古流向、砾石组分、砂岩组分和碎屑锆石年龄研究,分析北祁连—北山地区下白垩统的物源,进一步探讨早白垩世盆山格局.综合研究认为,早白垩世北祁连-北山地区的沉积物源分别来自南、北两大物源区.南部物源区由奥陶纪北祁连洋火山孤、中-晚志留世—泥盆系中祁连与阿拉善地块碰撞造山花岗岩、新元古代中祁连裂解岩浆岩与变质岩基底、早中生代南祁连岩浆岩组成;北部物源区则主要为华北克拉通西北缘古生代—中生代早期增生造山与后碰撞期花岗岩、塔里木板块东部敦煌-库鲁克塔格地块古元古代岩浆岩和深成变质岩.早白垩世初期,走廊带的沉积物源主要来自北部物源区,早白垩世早期南、北部物源同时存在,早白垩世中期则逐渐以南部源区为主,早白垩世晚期西北部和南部同时为物源供给区.整个早白垩世期间,北祁连-北山东部为统一的内陆湖盆群.

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物源分析是判断古侵蚀区位置和恢复盆山格局特征的重要方法之一.应用古流向、砾石组分、砂岩组分和碎屑锆石年龄研究,分析北祁连—北山地区下白垩统的物源,进一步探讨早白垩世盆山格局.综合研究认为,早白垩世北祁连-北山地区的沉积物源分别来自南、北两大物源区.南部物源区由奥陶纪北祁连洋火山孤、中-晚志留世—泥盆系中祁连与阿拉善地块碰撞造山花岗岩、新元古代中祁连裂解岩浆岩与变质岩基底、早中生代南祁连岩浆岩组成;北部物源区则主要为华北克拉通西北缘古生代—中生代早期增生造山与后碰撞期花岗岩、塔里木板块东部敦煌-库鲁克塔格地块古元古代岩浆岩和深成变质岩.早白垩世初期,走廊带的沉积物源主要来自北部物源区,早白垩世早期南、北部物源同时存在,早白垩世中期则逐渐以南部源区为主,早白垩世晚期西北部和南部同时为物源供给区.整个早白垩世期间,北祁连-北山东部为统一的内陆湖盆群.

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Available abstract

物源分析是判断古侵蚀区位置和恢复盆山格局特征的重要方法之一.应用古流向、砾石组分、砂岩组分和碎屑锆石年龄研究,分析北祁连—北山地区下白垩统的物源,进一步探讨早白垩世盆山格局.综合研究认为,早白垩世北祁连-北山地区的沉积物源分别来自南、北两大物源区.南部物源区由奥陶纪北祁连洋火山孤、中-晚志留世—泥盆系中祁连与阿拉善地块碰撞造山花岗岩、新元古代中祁连裂解岩浆岩与变质岩基底、早中生代南祁连岩浆岩组成;北部物源区则主要为华北克拉通西北缘古生代—中生代早期增生造山与后碰撞期花岗岩、塔里木板块东部敦煌-库鲁克塔格地块古元古代岩浆岩和深成变质岩.早白垩世初期,走廊带的沉积物源主要来自北部物源区,早白垩世早期南、北部物源同时存在,早白垩世中期则逐渐以南部源区为主,早白垩世晚期西北部和南部同时为物源供给区.整个早白垩世期间,北祁连-北山东部为统一的内陆湖盆群.

Key concepts: Geology, Provenance, Zircon, Geochronology, Cretaceous, Geochemistry, Structural basin, Paleontology

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The provenance of Lower Cretaceous basin in the Qilian Mountain-Beishan area: Evidence from paleocurrents, gravels, sandstone compositions and detrital zircon geochronology — Research Paper | ScholarLens