| 豫西洛峪口组凝灰岩锆石LA-MC-ICPMS U-Pb年龄及地层归属讨论 |
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| 引用本文： | 李承东,赵利刚,常青松,许雅雯,王世炎,许腾.豫西洛峪口组凝灰岩锆石LA-MC-ICPMS U-Pb年龄及地层归属讨论[J].中国地质,2017,44(3):511-525. |
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| 作者姓名： | 李承东 赵利刚 常青松 许雅雯 王世炎 许腾 |
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| 作者单位： | 天津地质矿产研究所, 天津 300170,天津地质矿产研究所, 天津 300170,天津地质矿产研究所, 天津 300170,天津地质矿产研究所, 天津 300170,河南省地质调查院, 河南 郑州 450001,天津地质矿产研究所, 天津 300170 |
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| 基金项目： | 中国地质调查局项目"中条-熊耳山成矿区地质矿产调查"（DD20160043）和国家自然科学基金项目（41272065）联合资助。 |
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| 摘 要： | 洛峪群—汝阳群主要分布在华北克拉通南缘,它们主要由石英砂岩夹少量页岩及白云岩组成。通过对豫西汝州洛峪口村、阳坡村附近的洛峪口组野外调查,发现洛峪口组含有多层凝灰岩夹层。采用LA-MC-ICPMS测年方法,对不同地点的洛峪口组凝灰岩夹层进行了锆石U-Pb年代学研究,分别获得(1638±9)Ma、(1634±10)Ma的年龄,表明洛峪口组形成于中元古代长城纪,并非原来认为的中—新元古代蓟县纪和青白口纪。由于洛峪口组位于洛峪群的顶部,很显然洛峪群及下伏汝阳群的时代均应归属长城纪。该组年龄的精确标定从根本上改变了原来豫西洛峪群—汝阳群划分方案。这对华北克拉通中—新元古代地层的划分与对比,对探讨大地构造演化与哥伦比亚超大陆的关系及早期生命演化均具有重要的意义。
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| 关 键 词： | 凝灰岩 洛峪口组 锆石LA-MC-ICPMS U-Pb测年 长城系 华北克拉通南缘 |
| 收稿时间： | 2017/5/11 0:00:00 |
| 修稿时间： | 2017/6/15 0:00:00 |
Zircon U-Pb dating of tuff bed from Luoyukou Formation in western Henan Province on the southern margin of the North China Craton and its stratigraphic attribution discussion |
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| LI Chengdong,ZHAO Ligang,CHANG Qingsong,XU Yawen,WANG Shiyan and XU Teng.Zircon U-Pb dating of tuff bed from Luoyukou Formation in western Henan Province on the southern margin of the North China Craton and its stratigraphic attribution discussion[J].Chinese Geology,2017,44(3):511-525. |
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| Authors: | LI Chengdong ZHAO Ligang CHANG Qingsong XU Yawen WANG Shiyan and XU Teng |
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| Institution: | Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China,Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China,Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China,Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China,Henan Institute of Geological Survey, Zhengzhou 450001, Henan, China and Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China |
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| Abstract: | Luoyu Group and Ruyang Group are cropped out extensively along the southern margin of the North China Craton (NCC), and are mostly composed of sandstone with minor shale and dolostone. Based on field investigation along Luoyukou and Yangpo Village section, Ruzhou City, Henan Province, a few interbedded tuff layers were found in the upper part of the Luoyukou Formation. By means of LA-MC-ICPMS zircon U-Pb dating, the ages of the volcanic eruption, 1638±9 Ma and 1634±10 Ma from Luoyukou Village and Yangpo section, were respectively obtained. These data mean that Luoyukou Formation was formed during Mesoproterozoic Changcheng period rather than during Meso-Neoproterozoic Jixian period and Qingbaikou period as previously held. According to the new dating data, the Luoyu Group and Ruyang Group which conformably underlies Luoyu Group ought to belong to the Mesoproterozoic Changcheng period, because Luoyukou Formation is at the uppermost part of Luoyu Group. This discovery has great significance for Meso-Neoproterozoic stratigraphic redivision and correlation in the NCC, and for the study of the relationship between the tectonic evolution history of the Late Paleoproterozoic to Early Mesoproterozoic geological records in the NCC and the breakup of the Columbia Supercontinent as well as for the evolution of the early life on the Earth. |
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| Keywords: | tuff Luoyukou Formation LA-MC-ICPMS zircon U-Pb dating Changchengian System southern margin of the NCC |
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