北京西郊下苇甸剖面张夏组强迫型海退记录

发布时间：2019-01-24 09:26

【摘要】：强迫型海退是海平面(或基准面)下降产生的海退过程,从而区别于正常海退。在克拉通盆地中,强迫型海退常产生沉积基底的暴露并且产生沉积间断,在特定背景下,也会留下相应的沉积记录,北京西郊下苇甸剖面张夏组就是一个典型实例。在该张夏组由一个三级层序构成,进一步可划分为3个四级层序。有序的沉积相序列形成的张夏组,快速加深事件不但产生淹没不整合型层序界面,而且形成了张夏组中下部更多的陆棚相泥岩和泥灰岩沉积;但是,在其顶部,鲕粒滩灰岩的发育就成为对强迫型海退进程的响应。因此,上述现象为研究张夏组鲕粒滩的发育特征提供了重要线索,也为大范围的研究提供了一个概念性模型。
[Abstract]:Forced regression is a regression process resulting from the decrease of sea level (or datum), which distinguishes it from normal regression. In the craton basin, the forced regression often produces the exposure of sedimentary basement and the occurrence of sedimentary discontinuity, and in the specific background, the corresponding sedimentary records will be left. The Zhangxia formation in the Xiweidian section of the western suburb of Beijing is a typical example. The Zhangxia formation is composed of a third order sequence, which can be further divided into three fourth order sequences. The rapid deepening of the Zhangxia formation formed by an orderly sequence of sedimentary facies not only resulted in submerged and non-integrated sequence interfaces, but also formed more continental shelf mudstone and marlite deposits in the middle and lower part of the Zhangxia formation. However, the development of oolitic beach limestone at its top is a response to the forced regression process. Therefore, these phenomena provide an important clue for the study of the developmental characteristics of the oolitic beach of Zhangxia formation, and also provide a conceptual model for the large-scale research.
【作者单位】：中国地质大学地球科学与资源学院;
【基金】：国家自然基金项目(No.41472090,40472065)资助
【分类号】：P531

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