| 华北克拉通南缘官道口群和洛峪群的年代学研究新进展——来自凝灰岩SHRIMP锆石U-Pb年龄的新证据 |
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| 引用本文： | 张恒,高林志,周洪瑞,宋彪,丁孝忠,张传恒,刘昊岗,龚成强.华北克拉通南缘官道口群和洛峪群的年代学研究新进展——来自凝灰岩SHRIMP锆石U-Pb年龄的新证据[J].岩石学报,2019,35(8):2470-2486. |
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| 作者姓名： | 张恒 高林志 周洪瑞 宋彪 丁孝忠 张传恒 刘昊岗 龚成强 |
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| 作者单位： | 中国地质科学院地质研究所, 北京 100037,中国地质科学院地质研究所, 北京 100037,中国地质大学, 北京 100083,中国地质科学院地质研究所, 北京 100037,中国地质科学院地质研究所, 北京 100037,中国地质大学, 北京 100083,中国地质大学, 北京 100083,中国地质大学, 北京 100083 |
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| 基金项目： | 本文受中国地质调查局地质调查项目（DD20190370）、国家自然科学基金项目（41572024）和科技部基础性工作专项（2015FY310100）联合资助. |
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| 摘 要： | 华北克拉通南缘结晶基底之上广泛发育中-新元古代(1800～542Ma)盖层岩系,但由于缺少精确的同位素年龄数据,其地层划分和对比方案一直存在较大的争议。本次工作在河南省栾川县龙家园组底部和下部各发现了一套凝灰岩,进而获得了1594±12Ma和1541±8Ma的SHRIMP锆石U-Pb年龄,首次精确标定了该地区龙家园组的形成时限,该组底界的时代接近1600Ma。龙家园组沉积时代为中元古代蓟县纪最早期;在河南省汝阳、汝州、鲁山地区的洛峪口组凝灰岩中获得了1596±7Ma、1596±15Ma、1608±17Ma和1620±16Ma的SHRIMP锆石U-Pb年龄,进一步精确标定了洛峪口组的形成时代,洛峪口组形成于长城纪的末期。结合汝阳群云梦山组碎屑锆石U-Pb年龄结果,汝阳群-洛峪群的形成时限约为1700～1600Ma。官道口群应是汝阳群之后的地层系统,而不是早前认为的与之同期的地层。
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| 关 键 词： | 华北克拉通南缘 龙家园组 洛峪口组 SHRIMP 锆石U-Pb |
| 收稿时间： | 2019/2/18 0:00:00 |
| 修稿时间： | 2019/6/6 0:00:00 |
Chronology progress of the Guandaokou and Luoyu groups in the southern margin of North China Craton: Constraints on zircon U-Pb dating of tuff by means of the SHRIMP |
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| ZHANG Heng,GAO LinZhi,ZHOU HongRui,SONG Biao,DING XiaoZhong,ZHANG ChuanHeng,LIU HaoGang and GONG ChengQiang.Chronology progress of the Guandaokou and Luoyu groups in the southern margin of North China Craton: Constraints on zircon U-Pb dating of tuff by means of the SHRIMP[J].Acta Petrologica Sinica,2019,35(8):2470-2486. |
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| Authors: | ZHANG Heng GAO LinZhi ZHOU HongRui SONG Biao DING XiaoZhong ZHANG ChuanHeng LIU HaoGang and GONG ChengQiang |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,China University of Geosciences, Beijing 100083, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,China University of Geosciences, Beijing 100083, China,China University of Geosciences, Beijing 100083, China and China University of Geosciences, Beijing 100083, China |
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| Abstract: | Meso-to Neoproterozoic (1800~542Ma) sedimentary rocks crop out extensively along the southern margin of the North China Craton, where they locally overlie Archean-Paleoproterozoic crystalline basement. However, due to the lack of accurate isotope age data, the division and correlation of the strata have always been controversial. Two interbedded tuffite layers in the bottom and lower part of the Longjiayuan Formation have been obtained in Luanchuan County, Henan Province, by means of the SHRIMP zircon U-Pb dating, the ages are 1594±12Ma and 1541±8Ma. With these data, the depositional age of the Longjiayuan Formation can be calibrated accurately for the first time, which indicates that the bottom age of this formation should be most likely about 1600Ma. The Longjiayuan Formation should be the earliest strata in the Mesoproterozoic Jixian System. Four interbedded tuffite layers in the Luoyukou Formation have been obtained in Ruyang, Ruzhou, Lushan counties, Henan Province, by means of the SHRIMP zircon U-Pb dating, the ages are 1596±7Ma, 1596±15Ma, 1608±17Ma and 1620±16Ma, respectively. These further confirme the depositional time of the Luoyukou Formation. Combining with the results of detrital zircon U-Pb data from the Yunmengshan Formation of the Ruyang Group, the depositional time span of both the Luoyu Group and the Ruyang Group can be limited roughly into the period from 1700Ma to 1600Ma. The Guandaokou Group should be strata after the Ruyang Group. |
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| Keywords: | The southern margin of North China Craton The Longjiayuan Formation The Luoyukou Formation SHRIMP Zircon U-Pb |
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