| 阿尔泰北部喀纳斯群碎屑岩锆石UPb同位素年龄及其意义 |
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| 引用本文： | 王星, 蔺新望, 赵端昌, 张亚峰, 菅坤坤, 杜彪, 朱伟鹏. 阿尔泰北部喀纳斯群碎屑岩锆石UPb同位素年龄及其意义[J]. 西北地质, 2016, 49(3): 13-27. |
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| 作者姓名： | 王星 蔺新望 赵端昌 张亚峰 菅坤坤 杜彪 朱伟鹏 |
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| 作者单位： | 1.陕西省地质调查中心, 陕西 西安 710068;; 2.太原理工大学, 山西 太原 030024 |
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| 基金项目： | 中国地质调查局“阿尔泰成矿带喀纳斯和东准地区地质矿产调查”（121201011000150003） |
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| 摘 要： | 阿尔泰北部大面积出露的喀纳斯群为一套巨厚的浅变质陆缘碎屑岩，本次工作系统采集了锆石同位素年龄样品及岩石地球化学样品，其地球化学分析结果显示沉积物来源于被动大陆边缘环境；获得的碎屑锆石U-Pb同位素年龄资料中，最年轻的岩浆锆石年龄为（545.8±3.7）Ma，据此可将喀纳斯群的底界定为震旦系；较老的元古代锆石年龄（858±13 Ma及1 800～1 983Ma）暗示了物源区很可能存在前寒武纪大陆地壳基底。
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| 关 键 词： | 喀纳斯群 锆石U-Pb年龄 复理石 碎屑沉积岩 阿尔泰 |
| 收稿时间： | 2016-03-02 |
| 修稿时间： | 2016-05-23 |
U-Pb Dating of Detrital Zircons from the Kanas Group in Northern Altay and Its Geological Significance |
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| WANG Xing, LIN Xinwang, ZHAO Duanchang, ZHANG Yafeng, JIAN Kunkun, DU Biao, ZHU Weipeng. U-Pb Dating of Detrital Zircons from the Kanas Group in Northern Altay and Its Geological Significance[J]. Northwestern Geology, 2016, 49(3): 13-27. |
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| Authors: | WANG Xing LIN Xinwang ZHAO Duanchang ZHANG Yafeng JIAN Kunkun DU Biao ZHU Weipeng |
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| Affiliation: | 1.Shaanxi Center of Geological Survey, Xi'an 710068, Shaanxi, China;; 2.College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China |
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| Abstract: | The Kanas Group is consists of thick epimetamorphic terrigenous clasolite, which occurs widely in northern Altay. In this paper, the samples of zircon isotopic dating and rock geochemicalanalysis have been collected systematically. The geochemical results show that these clasticsedimentaries were sourced from passive continental margin.The U-Pb dating of detrital Zircon from the Kanas Group yield the youngest magmatic Zircon age of 545.8±3.7 Ma, defining that the lower boundary of the Kanas Group can be delimit as Sanian. But the older Zircon ages are 858±13 Ma and 1 800-1 983 Ma, which belong to Proterozoic era,indicating the existence of Precambrian continental crust basement. |
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| Keywords: | Kanas Group zircon U-Pb dating flysch clastic sedimentary rock Altay |
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