| 侵入下马岭组的基性岩床的锆石和斜锆石U-Pb精确定年——对华北中元古界地层划分方案的制约 |
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| 引用本文： | 李怀坤,陆松年,李惠民,孙立新,相振群,耿建珍,周红英.侵入下马岭组的基性岩床的锆石和斜锆石U-Pb精确定年——对华北中元古界地层划分方案的制约[J].地质通报,2009,28(10):1396-1404. |
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| 作者姓名： | 李怀坤 陆松年 李惠民 孙立新 相振群 耿建珍 周红英 |
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| 作者单位： | 天津地质矿产研究所,天津,300170 |
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| 基金项目： | 中国地质调查局国土资源大调查项目《中国与亚洲地区关键地层划分与对比研究》，国家自然科学基金面上项目 |
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| 摘 要： | 华北克拉通马兰峪隆起北侧的下马岭组页岩中广泛发育辉绿岩床。分别利用高灵敏度、高精度的离子探针质谱法和同位素稀释热电离质谱法，测定了辉绿岩中锆石和斜锆石的U-Pb同位素年龄，获得了辉绿岩的侵位年龄1320Ma±6Ma。该年龄数据的获得制约了下马岭组的上限年龄不老于1320Ma。将下马岭组置于1400~1350Ma的区间内。综合已有的测年成果，对华北克拉通燕辽裂陷槽内中元古界的划分方案进行了厘定，提出了一个新的中元古界划分方案。建议方案中长城系包括常州沟组、串岭沟组、团山子组和大红峪组，时限为1800~1600Ma；蓟县系包括高于庄组、杨庄组、雾迷山组、洪水庄组和铁岭组，时限为1600~1400Ma；蓟县系之上1400~1000Ma期间的地层为待建系，亟需进一步研究。
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| 关 键 词： | 华北克拉通 1320Ma基性岩床 U-Pb 同位素定年 |
Zircon and beddeleyite U-Pb precision dating of basic rock sills intruding Xiamaling Formation, North China |
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| LI Huai-kun,LU Song-nian,LI Hui-min,SUN Li-xin,XIANG Zhen-qun,GENG Jian-zhen,ZHOU Hong-ying.Zircon and beddeleyite U-Pb precision dating of basic rock sills intruding Xiamaling Formation, North China[J].Geologcal Bulletin OF China,2009,28(10):1396-1404. |
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| Authors: | LI Huai-kun LU Song-nian LI Hui-min SUN Li-xin XIANG Zhen-qun GENG Jian-zhen ZHOU Hong-ying |
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| Institution: | Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China |
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| Abstract: | Diabase sills are wide-spread in the shales of the Xiamaling Formation to the north of the Malanyu uplift of the North China Craton. Time-dating minerals zircon and baddeleyite, separated from the diabase, have been dated by SHRIMP and ID-TIMS U-Pb isotopic methods. The emplacement age of the diabase 1320±6 Ma has been obtained, which indicates that the upper boundary age of the Xiamaling Formation must be younger than 1320 Ma. Based on recent dating achievements the Xiamaling Formaiton can be rather precisely put in the time span of 1400~1350 Ma. The Mesoproterozoic stratigraphic sequence of the Yanliao aulacogen in the North China Craton is collated and a new subdivision is proposed in this paper. In the new proposal the Changcheng System includes the Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu formations in ascending order with time span of 1800~1600 Ma; the Jixian System includes the Gaoyuzhuang, Yangzhuang, Wumishan, Hongshuizhuang and Tieling formations with time span of 1600~ 1400 Ma; and the 1400~1000 Ma part of the Mesoproterozoic strata above the Jixian System is undefined and much further work is needed. |
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| Keywords: | North China Craton 1320 Ma basic rock sills U-Pb dating E-mail: Xinglida@gmail com |
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