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首页> 外文期刊>Sedimentary geology >Sr-Nd isotopic and geochemical constraints on provenance of late Paleozoic to early cretaceous sedimentary rocks in the Western Hills of Beijing, North China: Implications for the uplift of the northern North China Craton
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Sr-Nd isotopic and geochemical constraints on provenance of late Paleozoic to early cretaceous sedimentary rocks in the Western Hills of Beijing, North China: Implications for the uplift of the northern North China Craton

机译：Sr-Nd同位素和地球化学对华北北京西山晚古生代至早白垩世沉积岩物源的制约：对华北克拉通北部隆升的启示

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摘要

Late Paleozoic to Mesozoic strata, which were deposited in the Western Hills of Beijing, North China, recorded the contemporary tectonic evolution of the northern part of the North China Craton (NCC). Finegrained sandstones and siltstones of these strata were analyzed for their major and trace element concentrations and Sr-Nd isotope compositions. Their La/Sc, Th/Sc, La/Co, Th/Co and Cr/Th ratios are similar to those of sediments derived from felsic source rocks, indicating that the original source materials were mostly intermediate to acidic rocks. Their ε_(Nd)(0) values show dramatic shifts, implying changes in provenances from the Late Paleozoic to the Early Cretaceous. The ε_(Nd)(0) values of the Late Paleozoic and the Late Jurassic to Early Cretaceous formations are very low. Whereas, the ε_(Nd)(0) values of the Xingshikou and the Xiaoyaopo formations are much higher, indicating that a juvenile component has been added into their sources. Based on the Sr-Nd isotope compositions, the Late Paleozoic and the Late Jurassic to Early Cretaceous samples fall in the Paleozoic to Mesozoic magmatic rocks distributed in the northern part of the NCC. However, the Sr-Nd isotope compositions of the Xingshikou and the Xiayaopo formations vary between the Xing-Meng Orogenic Belt (XMOB) and the north part of the NCC components. These changes can be interpreted by the complex uplift and exhumation history of the northern NCC from the Late Paleozoic to the Early Cretaceous. During the Late Carboniferous, the uplift of the Inner Mongolia Paleo-uplift (IMPU), which probably commenced at the Late Carboniferous, might supply detrital materials to the Late Paleozoic strata. In the Late Tri-assic, the uplift of the XMOB and IMPU was responsible for the mixing source of the Xingshikou Formation. After that, the northern XMOB became the main source of the Xiayaopo Formation, resulting from the uplift of the XMOB due to the collision of Siberia and North China-Mongolia plates during the Middle to Late Jurassic. Finally, the uplift of the YFTB, which occurred from the Late Jurassic to Early Cretaceous, provided the source materials and blocked the input of the XMOB components.
机译：沉积于华北北京西山的晚古生代至中生代地层记录了华北克拉通（NCC）北部的现代构造演化。分析了这些地层的细粒砂岩和粉砂岩的主要和痕量元素浓度以及Sr-Nd同位素组成。它们的La / Sc，Th / Sc，La / Co，Th / Co和Cr / Th比率与长英质烃源岩沉积物的比率相似，这表明原始烃源岩大多位于酸性岩石中间。它们的ε_（Nd）（0）值显示出戏剧性的变化，暗示着从古生代晚期到白垩纪早期的物源变化。晚古生代，侏罗纪晚期至白垩纪早期的ε_（Nd）（0）值非常低。而星石口组和小窑坡组的ε_（Nd）（0）值要高得多，表明它们的来源中已添加了幼年成分。根据Sr-Nd同位素组成，晚古生代和晚侏罗世至早白垩世样品落在NCC北部分布的古生代至中生代岩浆岩中。但是，星石口和下窑坡组的Sr-Nd同位素组成在星萌造山带（XMOB）和北海北部NCC组分之间有所不同。这些变化可以用从古生代晚期到白垩纪早期的北NCC复杂的隆升和发掘历史来解释。在石炭纪晚期，可能始于石炭纪晚期的内蒙古古隆起（IMPU）隆升可能为古生代晚期地层提供碎屑物质。在三叠纪晚期，XMOB和IMPU的隆升是星石口组的混合源。此后，北部XMOB成为下窑坡组的主要来源，这是由于在西侏罗纪至中侏罗世期间西伯利亚和华北-蒙古板块的碰撞导致XMOB隆升。最后，YFTB的隆升发生于侏罗纪晚期至白垩纪早期，提供了原始资料并阻止了XMOB分量的输入。

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  • 来源
    《Sedimentary geology》 |2012年第1期|p.17-28|共12页
  • 作者

    Shiwen Xie; Yuanbao Wu; Shan Gao; Xiaochi Liu; Lian Zhou; Laishi Zhao; Zhaochu Hu;

  • 作者单位

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosdences, Wuhan 430074, China;

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  • 正文语种 eng
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  • 关键词

    sedimentary rock; Sr-Nd isotope; tectonic evolution; yanshan fold and thrust belt; North China Craton;

    机译：沉积岩;Sr-Nd同位素;构造演化燕山褶皱冲断带华北克拉通;

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