| 河北地区中生代标准地层剖面侏罗系/白垩系界线——SHRIMP锆石U-Pb年龄标定 |
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| 引用本文： | 高林志,王屹石,张恒. 河北地区中生代标准地层剖面侏罗系/白垩系界线——SHRIMP锆石U-Pb年龄标定[J]. 地质通报, 2018, 37(7): 1186-1192 |
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| 作者姓名： | 高林志 王屹石 张恒 |
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| 作者单位： | 中国地质科学院地质研究所;北京第八中学 |
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| 基金项目： | 全国地层委员会项目《中国陆相地层划分对比及海相地层阶完善》（编号：1212011120142）和国家科技部基础工作专项《中国标准地层-中国地层表的完善》（编号：2015FY310100） |
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| 摘 要： | 在全国地层委员会组织的滦平盆地中生代地层野外考察中,采集了大北沟组凝灰岩样品,其锆石年龄测定结果引发对陆相侏罗系/白垩系界线的思考。冀北滦平地区陆相侏罗系—白垩系发育,各类陆相生物化石极丰富,地层产出大量火山凝灰岩层,是通过岩石地层、生物地层、同位素测年和磁性年代地层综合研究侏罗系/白垩系界线的理想地区。根据生物地层研究,冀北滦平盆地侏罗系/白垩系界线附近的地层为大北沟组和大店子组。根据冀北—辽西地区同位素测年数据,侏罗系/白垩系界线年龄倾向于130Ma。获得榆树下标准剖面大北沟组顶部凝灰岩(斑脱岩)SHRIMP锆石U-Pb同位素年龄为129.9±1.1Ma。
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| 关 键 词： | 侏罗系/白垩系 陆相地层 同位素测年 冀北滦平地区 |
| 收稿时间： | 2018-04-26 |
| 修稿时间： | 2018-05-29 |
A discussion on Jurassic and Cretaceous boundary based on the SHRIMP zircon U-Pb dating of Mesozoic holitype section in Luanping basin |
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| GAO Linzhi,WANG Yishi and ZHANG Heng. A discussion on Jurassic and Cretaceous boundary based on the SHRIMP zircon U-Pb dating of Mesozoic holitype section in Luanping basin[J]. Geologcal Bulletin of China, 2018, 37(7): 1186-1192 |
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| Authors: | GAO Linzhi WANG Yishi ZHANG Heng |
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| Affiliation: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,Beijing No.8 High School, Beijing 100033, China and Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | This paper is the record of a field investigation of Mesozoic strata in Luanping County, Hebei Province, which was organized by the Commission on Stratigraphy of China. A tuff sample was collected in the Dabeigou Formation at the top of the Jurassic strata. According to the chronostratigraphic dating, the authors think over the terrestrial Jurassic/Cretaceous boundary based on the tuff zircon dating. The terrestrial Jurassic and Cretaceous strata are well developed in Luanping County, Hebei Province. Various terrestrial fossils are very abundant with a large amount of tuffeous rocks. It is an ideal province for the study of Jurassic/Cretaceous boundary and the Dabeigou Formation and Dadianzi Formation based comprehensively on lithogical stratigraphy, biostratigraphy, chronostratigraphy and magnetostratigraphy. According to the chronostratigraphy, the boundary age of Jurassic/Cretaceous tends to favor the era of 130Ma. This paper reports a SHRIMP U-Pb age of 129.9±1.1Ma for tuff of the holitype section of the Dabeigou Formation from Yushuxia Village, Luanping County. |
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| Keywords: | Jurassic/Cretaceous terrestrial strata isotopic dating Luanping County, Hebei Province |
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