| 西藏西南普兰错果弄巴电气石二云母花岗岩SHRIMP锆石U-Pb定年 |
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| 引用本文： | 王英超,夏斌,张玉泉,王彦斌.西藏西南普兰错果弄巴电气石二云母花岗岩SHRIMP锆石U-Pb定年[J].大地构造与成矿学,2005,29(4):517-521. |
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| 作者姓名： | 王英超 夏斌 张玉泉 王彦斌 |
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| 作者单位： | 中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640;中国科学院研究生院,北京,100039;中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640;中国地质科学院北京离子探针中心,北京,100037 |
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| 基金项目： | 中国科学院知识创新工程项目 |
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| 摘 要： | 采用SHRIMP定年方法,测得错果弄巴花岗岩206Pb/238U年龄为(16±0.5)Ma。定年结果反映了岩浆从地壳深部快速上升的绝热降压变质事件形成于印度板块与欧亚板块挤压碰撞后的构造隆升环境,与喜马拉雅造山带大规模的逆冲推覆构造作用、伸展拆离作用和淡色花岗岩侵位同步,说明该区花岗岩经历了多期变质和复杂的地质演化过程。作者认为(16±0.5)Ma可以定为错果弄巴花岗岩体的最终侵位时间。
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| 关 键 词： | SHRIMP锆石U-Pb定年 电气石二云母花岗岩 错果弄巴 普兰 西藏 |
| 文章编号： | 1001-1552(2005)04-0517-05 |
| 收稿时间： | 2004-11-01 |
| 修稿时间： | 2005-05-10 |
U- PB SHRIMP ZIRCON AGES OF THE CUOGUONONGBA TOURMALINE TWO -MICA GRANITE IN PULAN, SOUTHWEST TIBET |
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| WANG Yingchao,XIA Bin,ZHANG Yuquan,WANG Yanbin.U- PB SHRIMP ZIRCON AGES OF THE CUOGUONONGBA TOURMALINE TWO -MICA GRANITE IN PULAN, SOUTHWEST TIBET[J].Geotectonica et Metallogenia,2005,29(4):517-521. |
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| Authors: | WANG Yingchao XIA Bin ZHANG Yuquan WANG Yanbin |
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| Abstract: | According to the advanced SHRIMP technique, it proved that the 206Pb/ 238U age of Cuoguonongba granitoids is (16±0.5)Ma. The age represented the therm-isolation, decompression and metamorphic event accompanied the magma quickly rising from the depth, and also phasing in the large-scale thrust-nappe structure, stretch resolution and yosemitite invasion, which came from the structure elevation of Indian plate and Eurasian plate collision, and the age also suggested that the granitoids in this area experienced multi-period metamorphism and complex geological evolution process. So it believed the (16±0.5)Ma might be the last invasion time of Cuoguonongba granitoids. |
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| Keywords: | SHRIMP zircon U -Pb dating tourmaline two- mica granite Cuoguonongba Pulan Tibet |
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