燕山西段元古界下马岭组层序地层特征及地层格架  

Sequence Stratigraphic Characteristics and Stratigraphic Framework of the Proterozoic Xiamaling Formation, Western Yanshan Mountains

作　　者：林东升 张立伟 汪凯 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京

出　　处：《地球科学前沿（汉斯）》2023年第8期971-978,共8页Advances in Geosciences

摘　　要：以野外露头观察和室内详细研究为基础,结合沉积模式和层序地层学基本原理,系统分析了燕山西段下马岭组的沉积特征,进行了单剖面层序地层划分。燕山西段下马岭组以陆源碎屑滨浅海沉积为主,部分地区发育少量碳酸盐岩夹层。涿鹿盘到底剖面是研究区下马岭组发育最全的剖面,可以识别出2个三级层序(S.1和S.2),都由海侵体系域、早期高水位体系域和晚期高水位体系域组成。延庆千沟剖面下马岭组三分性不明显,仅可以划分出海侵体系域和高水位体系域两部分。由于构造抬升破坏,下马岭组在赤城大岭堡剖面仅保留海侵体系域。通过空间上的大范围追索和对比,建立了燕山西段下马岭组的层序地层格架,为燕山地区前寒武纪的进一步研究提供了基础资料。Based on a comprehensive study on outcrop and laboratory, combined with the fundamental principles and methods of sequence stratigraphy, this paper analyzes the sedimentary characte-ristics of the Xiamaling Formation developing in Western Yanshan Mountains, which are mainly composed of terrigenous clastic rocks. Pandaodi Section is the most complete section in study area, which can be divided into two third-order sequences, (S.1 and S.2). Every third-order sequence in Pandaodi Section includes three parts, which is Transgressive System Tract, Early Highstand System Tract, and Late Highstand System Tract. However, the trichotomy of Xiamaling Formation in Qiangou Section is not obvious, which only can be divided into Transgressive System Tract and Highstand System Tract. Due to the destruction of tectonic uplift, the Xiamaling Formation in Dalingpu Section only preserves the Transgressive System Tract. By correlation of sequences in the study area, the sequence stratigraphic framework is established, which provides basic data for the further study of Precambrian in Yanshan area.

关 键 词：燕山西段 下马岭组 沉积相 层序地层学 地层格架 

分 类 号：P61[天文地球—矿床学]