| 藏北羌塘菊花山那底岗日组火山岩锆石SHRIMP定年及其意义 |
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| 引用本文： | 翟庆国,李才.藏北羌塘菊花山那底岗日组火山岩锆石SHRIMP定年及其意义[J].地质学报,2007,81(6):795-800. |
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| 作者姓名： | 翟庆国 李才 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 吉林大学地球科学学院,长春,130061 |
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| 基金项目： | 国家自然科学基金项目(编号:40672147)，中国地质调查局项目(编号:1212010561605和200313000015)资助成果 |
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| 摘 要： | 那底岗日组主要为一套中酸性火山岩、火山碎屑岩,夹砂砾岩的岩石组合,主要分布在藏北羌塘中部地区,龙木错-双湖缝合带的北侧。对那底岗日组底部安山岩进行锆石SHRIMP测年,时代为219±4Ma,确定那底岗日组火山岩早期喷发时间为晚三叠世而不是早侏罗世,与龙木错-双湖一线的低温高压变质带的时代基本一致。结合区域地质资料,那底岗日组火山岩可能形成于板块消减的火山弧构造环境,为龙木错-双湖缝合带晚三叠世向北俯冲消减的产物。
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| 关 键 词： | 羌塘 那底岗日组 安山岩 SHRIMP定年 火山弧 |
| 修稿时间： | 3/6/2007 12:00:00 AM |
Zircon SHRIMP Dating of Volcanic Rock from the Nadigangri Formation in Juhuashan, Qiangtang, Northern Tibet and Its Geological Significance |
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| ZHAI Qingguo,LI Cai.Zircon SHRIMP Dating of Volcanic Rock from the Nadigangri Formation in Juhuashan, Qiangtang, Northern Tibet and Its Geological Significance[J].Acta Geologica Sinica,2007,81(6):795-800. |
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| Authors: | ZHAI Qingguo LI Cai |
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| Institution: | 1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing , 100037 ; 2 College of Earth Sciences, Jilin University, Changchun, Jilin, 130061 |
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| Abstract: | The Nadigangri Formation consist of intermediate-acidic volcanics, volcaniclastic rocks intercalated with glutenite, in the central Qiangtang area, north of the Longmu Co-Shuanghu suture, northern Tibet. The SHRIMP U-Pb age of zircons from andesite at the bottom of volcanics is 2194 Ma, which indicates the volcanisms started in the late Triassic and accords with the age of low-temperature high-pressure metamorphism in this area. According to regional geological data, the volcanics of the Nadigangri Formation probably formed in a volcanic arc tectonic setting and was the result of a northward subduction of the Longmu Co-Shuanghu suture in the late Triassic. |
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| Keywords: | Qiangtang Nadigangri Formation andesite SHRIMP dating volcanic arc |
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