| 唐王陵昭陵组砾岩碎屑锆石U-Pb年代学分析 |
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| 引用本文： | 张文龙,陈刚,章辉若,高磊,杨甫,师晓林,申锦江.唐王陵昭陵组砾岩碎屑锆石U-Pb年代学分析[J].沉积学报,2016,34(3):497-505. |
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| 作者姓名： | 张文龙 陈刚 章辉若 高磊 杨甫 师晓林 申锦江 |
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| 作者单位： | 1.西北大学大陆动力学国家重点实验室/地质学系 西安 710069; |
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| 基金项目： | 中国地质调查局油气资源项目(1212011220761)，西北大学研究生自主创新资助项目(YZZ14020)，国家基础科学人才培养基金(XDCX2014-18)Oil and Gas Project of China Geological Survey |
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| 摘 要： | 唐王陵砾岩的时代归属及其沉积物源环境一直是鄂尔多斯盆地南缘新元古界-下古生界沉积地层学研究和油气地质勘探备受关注且长期存有争议的问题。采用LA-ICP-MS锆石U-Pb年代学方法,定量分析探讨了唐王陵昭陵组砾岩的时代归属和物质来源。结果表明:昭陵组砾岩的碎屑锆石U-Pb测年数据主要分布在744~943 Ma(n=6)、1 005~1 412 Ma (n=15)、1 449~2 209 Ma(n=255)和2 274~2 696 Ma (n=49)四个年龄区间,相应的峰值年龄集中在815 Ma、1 182 Ma、1 811 Ma、2 454 Ma,最年轻的单颗粒锆石年龄为744 Ma。它与盆地西缘贺兰山地区震旦纪正目观组的碎屑锆石U-Pb年龄谱非常相似,但明显有别于盆地南缘晚奥陶世平凉组,尤其是缺少平凉组碎屑锆石主要集中在454 Ma的峰值年龄,由此限定昭陵组砾岩的沉积时代主要发生在晚前寒武纪或震旦纪。锆石U-Pb年龄谱的区域对比揭示,昭陵组砾岩的沉积物源主要来自于华北(鄂尔多斯)地块的古元古代变质基底岩系和其南缘北秦岭构造带的晚前寒武纪岩浆岩-变质杂岩,呈现稳定地块与活动带双向混合物源特征。
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| 关 键 词： | 鄂尔多斯盆地南缘 唐王陵砾岩 昭陵组 锆石U-Pb年代学 地层时代 沉积物源 |
| 收稿时间： | 2014-09-04 |
Detrital Zircon U-Pb Geochronology from Zhaoling Formation in Tangwangling |
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| ZHANG WenLong,CHEN Gang,ZHANG HuiRuo,GAO Lei,YANG Fu,SHI XiaoLin,SHEN JinJiang.Detrital Zircon U-Pb Geochronology from Zhaoling Formation in Tangwangling[J].Acta Sedimentologica Sinica,2016,34(3):497-505. |
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| Authors: | ZHANG WenLong CHEN Gang ZHANG HuiRuo GAO Lei YANG Fu SHI XiaoLin SHEN JinJiang |
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| Institution: | 1.Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;2.PetroChina Changqing Oilfield Company, Xi'an 710021, China;3.Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi'an 710016,China |
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| Abstract: | The deposition time and provenance of Zhaoling Formation in Tangwangling has not been conclusiving since it was found, In order to determine the Zhaoling Formation's assignment, this article has performed studies with the clastic sample from Zhaoling Formation by the method of LA-ICP-MS zircon U-Pb dating, based on the age distribution of zircons this article discussed the deposition time and sedimentary provenance of Zhaoling Formation. The results shows: The detrital zircon ages of Zhaoling Formation mainly include 744~943 Ma(n=6), 1 005~1 412 Ma (n=15), 1 449~2 209 Ma (n=255) and 2 274~2 696 Ma (n=49), the corresponding peak ages are 815 Ma, 1 182 Ma, 1 811 Ma, 2 454 Ma, the minimum age for single detrial zircon is 774 Ma. At the same time, the zircon U-Pb ages shows the deposition time of Zhaoling Formation is similar to Zhengmuguang Formation but not Pingliang Formation, especially lack of the characteristics detrital zircon U-Pb peak age of 454 Ma, they all show that the Zhaoling Formation maximum deposition era is Precambrian. The comparative analyses of zircon U-Pb age shows that the main sources of Zhaoling Formation come from the paleoproterozoic metamorphic basement of North China Craton and Precambrian complex granitic intrusion of North Qinling Mountain, respectively. |
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| Keywords: | south margin of the Ordos Basin Tangwangling conglomerates Zhaoling Formation U-Pb geochronology stratigraphic formation time sedimentary provenance |
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