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首页> 外文期刊>Journal of Asian earth sciences >Late Jurassic to Early Cretaceous sedimentary-tectonic development in the Chengde Basin, Yanshan fold-thrust belt, North China Craton
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Late Jurassic to Early Cretaceous sedimentary-tectonic development in the Chengde Basin, Yanshan fold-thrust belt, North China Craton

机译：华北克拉通燕山褶皱冲断带承德盆地侏罗纪晚期至白垩纪早期沉积构造发育

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The Chengde Basin is located in the central part of the Yanshan fold-thrust belt in the northern North China Craton. The sediments in the Upper Jurassic to Lower Cretaceous Tuchengzi Formation in the Chengde Basin provide a detrital record of basin dynamics and uplift of the basin margins during that time. We analyzed the sedimentary fades, paleocurrents, and provenance of the Tuchengzi Formation in the Chengde Basin for the period of the Late Jurassic and Early Cretaceous shortening in the Yanshan fold-thrust belt. Four sedimentary facies associations have been identified in the Tuchengzi Formation, corresponding to proximal fan, mid-fan, distal alluvial fan, and fluvial facies. The transport and distribution of the Upper Jurassic to Lower Cretaceous sediments in the Chengde Basin was controlled by the faults bounding the basin. Paleocurrent indicators and provenance data of conglomerate clasts reveal that the sediments of the Tuchengzi Formation in the northern part of the Chengde Basin were delivered from source regions to the north of the basin. The early sediments of the Tuchengzi Formation in the southern part of the basin comprise a suite of fluvial deposits, similar to the fluvial sediments in the northern part of the basin, and their paleocurrent data and the compositions of conglomerate clasts also suggest a northern source. However, the subsequent sedimentation in the Tuchengzi Formation in the southern part of the basin changed markedly to proximal fan fades, with sediments being derived from the south of the basin, according to the paleocurrent data and conglomerate clast lithology. The Sandaohe sheet, which is located in the southeast limb of the Chengde syncline, is not a klippe formed as a result of long-distance northward thrusting, but an autochthonous pop-up tectonic wedge generated by N-S shortening during the Early Cretaceous sedimentation of the Tuchengzi Formation. The sedimentation ended before the onset of the Early Cretaceous volcanic eruption recorded by the Zhangjiakou Formation, which unconformably overlies the Tuchengzi Formation. (C) 2014 Elsevier Ltd. All rights reserved.
机译：承德盆地位于华北克拉通北部燕山褶皱冲断带的中部。承德盆地上侏罗统至下白垩统土城子组的沉积物提供了该时期盆地动力学和盆地边缘隆升的不利记录。我们分析了燕山褶皱冲断带晚侏罗世和早白垩世缩短期的承德盆地土城子组沉积衰变，古流和物源。在土城子组中已经发现了四个沉积相组合，分别对应于近扇，中扇，冲积扇和河流相。承德盆地上侏罗统至下白垩统沉积物的运移和分布受盆地边界断层控制。砾岩碎屑的古流变指标和物源数据表明，承德盆地北部土城子组的沉积物是从源区输送到盆地北部的。盆地南部土城子组的早期沉积物包括一套河流沉积物，类似于盆地北部的河流沉积物，其古流数据和砾岩碎屑的组成也暗示了北部的来源。然而，根据古流变数据和砾岩碎屑岩性，盆地南部土城子组随后的沉积显着改变为近扇扇状沉积，沉积物来自盆地南部。位于承德向斜线东南肢体上的三道河板并不是长距离向北推进形成的飞来峰，而是在白垩世早白垩世沉积中由NS缩短产生的土生弹出构造楔。土城子组。沉积在张家口组记录的早白垩纪火山喷发开始之前就结束了，该火山不整合地覆盖了土城子组。 （C）2014 Elsevier Ltd.保留所有权利。

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