摘要
土城子组为一套广泛分布于冀北、辽西地区的陆相沉积地层.自20世纪80年代以来,该套地层的时代问题便是众多学者关注和争论的焦点.文章通过LA-ICP-MS锆石U-Pb同位素测年,得出北京延庆千家店土城子组下部年龄为（157.6±0.7）Ma,中上部年龄为（157.1±1.0）Ma,属于晚侏罗世早期.结合前人资料,认为燕山地区土城子组发育时限为163-130Ma,在此期间土城子组呈现出迁移性、间断性的沉积特征;146~137Ma为土城子组主体的沉积年龄;土城子组与髫髻山组、张家口组之间在区域上并不存在不整合关系,在大部分情况下应属同一构造背景下的产物.
Tuchengzi Formation is a widely distributed continental sedimentary stratum in northern Hebei and western Liaoningprovinces. Since the 1980s, the stratigraphic age of this formation has attracted much attention and aroused heated debate amongresearchers. Through LA-ICP-MS U-Pb dating of zircons, the authors obtained two early Late Jurassic ages of this formation inQianjiadian area. One of them is 157.6±0.7 Ma for the lower part, and the other is 157.1±1.0 Ma for the upper part. Combined withprevious data, the ages of Tuchengzi Formation should be 163- 130 Ma in the Yanshan area. During this period, TuchengziFormation showed mobility and intermittent sedimentary characteristics. The primary sedimentary ages of Yanshan area should be146-137 Ma, and the contact relationship between Tiaojishan, Tuchengzi and Zhangjiakou formations are not in unconformity. Theauthors consider that they should be products of the same ectonic setting in most cases.
作者
焦润成
贺瑾瑞
王荣荣
王强强
回广骥
JIAO Run-cheng HE Jin-rui WANG Rong-rong WANG Qiang-qiang HUI Guang-ji(Beijing Institute of Geology,Beijing 100020,China China University of Geosciences （Beijing）,Beijing 100083,China)
出处
《中国地质》
CAS
CSCD
北大核心
2016年第5期1750-1760,共11页
Geology in China
基金
北京市国土资源局项目(0747-1361SITCN217)
北京市地质环境图系编制项目(1441STC60232)联合资助~~
