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Detrital Zircon Dating of meso-and neoproterozoic Rocks in North China and Its Implications

Acta Geologica Sinica(English Edition) 2011年第2期85卷 271-282页

作者： GAO Linzhi LIU Pengju YIN Chongyu ZHANG Chuanheng DING Xiaozhong LIU Yanxue SONG Biao Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University of Geosciences Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

New dates from meso- and neoproterozoic strata contribute to the recently defined Precambrian stratigraphical timescale of China agreed by the Subcommission on the Precambrian System, and the National Commission on Stratigraphy of China on Nov. 24, 2009. First, the age range of the Changcheng System, including the Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu formations has been constrained to 1.8-1.6 Ga. Second, the Jixian System including the Gaoyuzhuang,Yangzhuang, Wumishan, Hongshuizhuang and Tieling formations has been constrained to 1.6-1.4 ***, an as-yet unnamed （undefined） system （1.4-1.0 Ga） is only developed in the Xiamaling Formation at the Jixian section, Tianjing. Fourth, the Qingbaikou System, including the Luotuoling and Jing＇eryu formations has been constrained to 1.0-0.78 Ga. Fifth, the Nanhuan System ranges between 780-635 Ma, and the Sinian System is within 635-542 Ma. However, according to a series of SHRIMP U-Pb dates from the late Precambrian in the Jiangnan Orogen Belt in South China Platform, the constrained strata will be redefined as in the upper part of the Qingbaikou System. To aid global geodynamies, it is useful to denote a late Precambrian section with unified, precise and high-precision chronological dating; this is here defined in North China Block and Jiaoliao-Korean Block. However, the neoproterozoic Qingbaikou study in North China will be influence in whole meso- and neoproterozoic in the Jiangnan Orogenic Belt in between the Yangtze Block and the Cathaysia Block in South China.

关键词： meso- and neoproterozoic chronostratigraphic sequence tectonic events China

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Reclassification of the meso- and neoproterozoic Chronostratigraphy of North China by SHRIMP Zircon Ages

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1074-1084页

作者： GAO Linzhi ZHANG Chuanheng LIU Pengju TANG Feng SONG Biao DING Xiaozhong Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University ofGeosciences Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

High-quality zircon U-Pb ages acquired from meso- and neoproterozoic strata in North China in recent years has provided a high-resolution chronostratigraphic framework for dating. A basis of this high-level chronostratigraphic system provides the foundation for a global Precambrian study and stratigraphic correlation and so recent geological studies have focused attention on systemic SHRIMP zircon dating. A chronology of meso- and neoproterozoic strata and the time of origin of the overlying Changcheng System is given on the basis of new SHRIMP zircon dating from the Qianxi Complex and diabase of the Chuanlinggou Formation. A new tectonostratigraphy for a neoproterozoic chronostratigraphic framework in the southeastern margin of the North China continent is underpinned by the new SHRIMP zircon dating of a neoproterozoic mafic magma diabase in the Jiao-Liao-Xu-Huai Sub-Province.

关键词： geochronology SHRIMP U-Pb dating meso- and neoproterozoic North China continent

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