Reconstruction of the Cenozoic deformation of the Bohai Bay Basin, North China
Reconstruction of the Cenozoic deformation of the Bohai Bay Basin, North China
复制标题
DOI：
10.1111/bre.12470
复制
发表时间：
2020-05
期刊：
影响因子：
3.2
通讯作者：
Yinbing Zhu;Shaofeng Liu;Bo Zhang-;M. Gurnis;P. Ma
中科院分区：
文献类型：
--
作者：
Yinbing Zhu;Shaofeng Liu;Bo Zhang-;M. Gurnis;P. Ma
一个约束良好的板块变形模型可以帮助我们更好地理解沉积盆地的形成以及俯冲历史与覆冲板块变形之间的联系。由于缺乏全面的约束，建立盆地运动学和变形的定量模型仍然具有挑战性。渤海湾盆地是华北克拉通破坏的重要表现，记录了东亚新生代板块运动历史。尽管人们对BBB的形成提出了许多解释，但很少有定量的盆地重建模型来检验和完善以前的想法。在平衡剖面和构造、地层和沉积年龄数据的约束下，我们对BBB进行了定量变形重建。重建结果表明，盆地形成过程主要分为古新世—早始新世（65 ~ 42 Ma）伸展起始阶段、中始新世—早渐新世（42 ~ 32.8 Ma）伸展高潮阶段和后渐新世（32.8 ~ 0 Ma）伸展后沉降阶段。在盆地形成过程中，BBB的变形具有空间非均匀性，速度方向呈顺时针方向旋转。重建结果支持了走滑断裂和正交伸展形成BBB的解释，并将盆地划分为张拉-张拉复合盆地。我们认为，盆地速度场的顺时针旋转是由太平洋板块俯冲方向的逆时针旋转驱动的。BBB的运动学表明，在太平洋板块重组的关键时期，太平洋板块可能与东亚板块有充分的耦合。新的重建不仅为研究BBB附近的变形过程，而且为更广泛地研究整个东亚地区的变形过程提供了定量基础。
A well‐constrained plate deformation model may lead to an improved understanding of sedimentary basin formation and the connection between subduction history and over‐riding plate deformation. Building quantitative models of basin kinematics and deformation remains challenging often due to the lack of comprehensive constraints. The Bohai Bay Basin (BBB) is an important manifestation of the destruction of the North China Craton, and records the plate kinematic history of East Asia during the Cenozoic. Although a number of interpretations of the formation of the BBB have been proposed, few quantitative basin reconstruction models have been built to test and refine previous ideas. Here, we developed a quantitative deformation reconstruction of the BBB constrained with balanced cross‐sections and structural, stratigraphic and depositional age data. Our reconstruction suggests that the basin formation process was composed of three main stages: Paleocene‐early Eocene (65–42 Ma) extension initiation, middle Eocene‐early Oligocene (42–32.8 Ma) extension climax and post‐Oligocene (32.8–0 Ma) post‐extensional subsidence. The deformation of the BBB is spatially heterogeneous, and its velocity directions rotated clockwise during the basin formation process. The reconstruction supports the interpretation that the BBB formed via strike‐slip faulting and orthogonal extension and that the basin is classified as a composite extensional‐transtensional basin. We argue that the clockwise rotation of the basin velocity field was driven by the counter‐clockwise rotation in the direction of Pacific Plate subduction. The kinematics of the BBB imply that the Pacific Plate may have been sufficiently coupled to the over‐riding East Asian Plate during the critical period of Pacific Plate reorganization. The new reconstruction provides a quantitative basis for studies of deformation processes not only in the vicinity of the BBB, but also more broadly throughout East Asia.