| 北京北部千家店土城子组LA-ICP-MS锆石U-Pb同位素测年及启示 |
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| 引用本文： | 焦润成,贺瑾瑞,王荣荣,王强强,回广骥.北京北部千家店土城子组LA-ICP-MS锆石U-Pb同位素测年及启示[J].中国地质,2016(5):1750-1760. |
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| 作者姓名： | 焦润成 贺瑾瑞 王荣荣 王强强 回广骥 |
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| 作者单位： | 北京市地质研究所, 北京 100120,北京市地质研究所, 北京 100120,中国地质大学(北京), 北京 100083,北京市地质研究所, 北京 100120,中国地质大学(北京), 北京 100083 |
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| 基金项目： | 北京市国土资源局项目（0747-1361SITCN217）与北京市地质环境图系编制项目（1441STC60232）联合资助。 |
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| 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163~130 Ma,在此期间土城子组呈现出迁移性、间断性的沉积特征;146~137 Ma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。
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| 关 键 词： | 土城子组 火山岩 锆石 LA-ICP-MS 年代地层 |
| 收稿时间： | 2015/7/31 0:00:00 |
| 修稿时间： | 2016/6/23 0:00:00 |
LA-ICP-MS U-Pb dating of zircons from Tuchengzi Formation in Qianjiadian of North Beijing and its significance |
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| JIAO Run-cheng,HE Jin-rui,WANG Rong-rong,WANG Qiang-qiang and HUI Guang-ji.LA-ICP-MS U-Pb dating of zircons from Tuchengzi Formation in Qianjiadian of North Beijing and its significance[J].Chinese Geology,2016(5):1750-1760. |
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| Authors: | JIAO Run-cheng HE Jin-rui WANG Rong-rong WANG Qiang-qiang and HUI Guang-ji |
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| Institution: | Beijing Institute of Geology, Beijing 100020, China,Beijing Institute of Geology, Beijing 100020, China,China University of Geosciences(Beijing), Beijing 100083, China,Beijing Institute of Geology, Beijing 100020, China and China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | Tuchengzi Formation is a widely distributed continental sedimentary stratum in northern Hebei and western Liaoning provinces. Since the 1980s, the stratigraphic age of this formation has attracted much attention and aroused heated debate among researchers. Through LA-ICP-MS U-Pb dating of zircons, the authors obtained two early Late Jurassic ages of this formation in Qianjiadian 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 with previous data, the ages of Tuchengzi Formation should be 163-130 Ma in the Yanshan area. During this period, Tuchengzi Formation showed mobility and intermittent sedimentary characteristics. The primary sedimentary ages of Yanshan area should be 146-137 Ma, and the contact relationship between Tiaojishan, Tuchengzi and Zhangjiakou formations are not in unconformity. The authors consider that they should be products of the same ectonic setting in most cases. |
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| Keywords: | Tuchengzi Formation volcanic rocks zircon LA-ICP-MS chronostratigraphy |
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