| 藏北羌塘中部日湾茶卡组物源——LA-ICP-MS锆石U-Pb年龄及稀土元素特征 |
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| 引用本文： | 彭 虎,李 才,解超明,王 明,江庆源,陈景文.藏北羌塘中部日湾茶卡组物源——LA-ICP-MS锆石U-Pb年龄及稀土元素特征[J].地质通报,2014,33(11):1715-1727. |
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| 作者姓名： | 彭 虎 李 才 解超明 王 明 江庆源 陈景文 |
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| 作者单位： | 吉林大学地球科学学院，吉林 长春 130061 |
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| 基金项目： | 国家自然科学基金项目(批准号:41272240、41072166);中国地质调查局项目(编号:1212011121248、1212011221093) |
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| 摘 要： | 在龙木错—双湖—澜沧江板块缝合带中段的冈玛错—日湾茶卡地区,近东西向展布着一条富含暖水型生物化石的早石炭世地层日湾茶卡组(C1r)。对日湾茶卡组砂岩中的碎屑锆石进行LA-ICP-MS U-Pb定年,分析结果显示存在325~400Ma、400~500Ma、500~600Ma、950~1100Ma、1400~1800Ma和大于1800Ma六个年龄区间;最年轻的碎屑锆石年龄为325 Ma,时代为早石炭世维宪期;碎屑锆石中362 Ma和454Ma的年龄峰值最明显,为龙木错—双湖—澜沧江洋岛弧消减事件和加里东运动的年龄记录,表明碎屑岩的物源区主要来自于扬子大陆周缘。结合古生物化石资料可知,日湾茶卡组属于欧亚大陆扬子型石炭纪沉积地层,为岛弧环境下的一套浅水台型沉积。
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| 关 键 词： | 青藏高原 羌塘 扬子型沉积 碎屑锆石 LA-ICP-MS锆石U-Pb年龄 加里东期运动 |
Riwanchaka Group in central Qiangtang Basin, the Tibetan Plateau: Evidence from detrital zircons |
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| PENG Hu,LI Cai,XIE Chao-ming,WANG Ming,JIANG Qing-yuan,CHEN Jing-wen.Riwanchaka Group in central Qiangtang Basin, the Tibetan Plateau: Evidence from detrital zircons[J].Geologcal Bulletin OF China,2014,33(11):1715-1727. |
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| Authors: | PENG Hu LI Cai XIE Chao-ming WANG Ming JIANG Qing-yuan CHEN Jing-wen |
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| Institution: | College of Earth Science, Jilin University, Changchun 130061, Jilin, China |
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| Abstract: | The Riwanchaka Formation (C1r), a set of carbonate and clastic early Carboniferous strata rich in warm-water fossils, is spread in the Gangmar Co-Riwanchaka area along the central Lungmu Co-Shuanghu-Lancang River suture zone nearly in east-west direction. An analysis of 120 age data of sandstone samples from the Riwanchaka Formation indicates that detrital zircon has six age ranges, which are 325~400Ma, 400~500Ma, 500~600Ma, 950~1100Ma, 1400~1800Ma and >1800Ma, and that the youngest detrital zircon age is 325Ma, which confirms its age of Early Carboniferous. Among these ages, peak ages of 362Ma and 454Ma are the most obvious. They reflect the tectonic magmatic events of the initial arc reduction stage in the Lungmu Co-Shuanghu-Lancang River Ocean and the Caledonian orogeny, implying that the provenance of the clastic rocks was probably the Yangtze Continent. In combination with the information of fossils, the authors hold that the Riwanchaka Formation (C1r) should be Carboniferous sedimentary strata of Eurasia Yangtze type, belonging to the shallow water deposition in an island arc environment. |
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| Keywords: | Tibetan Plateau Qiangtang Yangtze type deposition LA-ICP-MS zircon U-Pb dating Caledonian movement |
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