| 三江上叠裂谷盆地人支雪山组火山岩锆石U-Pb定年与地质意义 |
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| 引用本文： | 王保弟,王立全,王冬兵,张万平.三江上叠裂谷盆地人支雪山组火山岩锆石U-Pb定年与地质意义[J].岩石矿物学杂志,2011,30(1):25-33. |
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| 作者姓名： | 王保弟 王立全 王冬兵 张万平 |
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| 作者单位： | 成都地质矿产研究所,四川,成都,610081 |
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| 基金项目： | 国家重点基础研究发展规划项目(2009CB421003); 国家自然科学基金(41073033,40872055); 中国地质调查局项目(1212010610101) |
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| 摘 要： | 三江上叠裂谷盆地人支雪山组火山岩是赋存火山成因块状硫化物矿床(VHMS)的重要层位,但对其形成时代一直存在着争议。本文对几家顶一带人支雪山组火山岩进行了LA-ICPMS锆石U-Pb年代学研究,结果显示,两件流纹岩样品中锆石23个分析点的206Pb/238U年龄分别为247.4±2.1Ma和249.1±1.6Ma,因此人支雪山组火山岩形成于早三叠世(249～247Ma)。地球化学资料表明,人支雪山组火山岩形成于一个伸展的地球动力学背景,由此本文认为金沙江结合带在早三叠世已进入弧-陆碰撞后的伸展时期。
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| 关 键 词： | U-Pb年代学 碰撞后伸展 块状硫化物矿床 人支雪山组 上叠裂谷盆地 |
Zircons U-Pb dating of volcanic rocks from Renzhixueshan Formation in Shangdie rift basin of Sanjiang area and its geological implications |
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| WANG Bao_di,WANG Li_quan,WANG Dong_bing and ZHANG Wan_ping.Zircons U-Pb dating of volcanic rocks from Renzhixueshan Formation in Shangdie rift basin of Sanjiang area and its geological implications[J].Acta Petrologica Et Mineralogica,2011,30(1):25-33. |
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| Authors: | WANG Bao_di WANG Li_quan WANG Dong_bing and ZHANG Wan_ping |
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| Institution: | WANG Bao-di,WANG Li-quan,WANG Dong-bing and ZHANG Wan-ping(Chengdu Institute of Geology and Mineral Resources,Chengdu 610081,China) |
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| Abstract: | It is generally accepted that the volcanics-hosted massive sulfide deposits were widely derived from the marine settings,such as island arc,back-arc basin,mid-ocean ridges,and intraplate spreading centers.Different tectonic regimes are typically marked by changes in the composition of the associated marine volcanic rocks and different ore mineral assemblages in volcanic massive sulfide deposits.Volcanic rocks from Renzhixueshan Formation in Shangdie rift basin of Sanjiang is an important layer hosting volca... |
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| Keywords: | U-Pb chronological data post-collision extension volcanic massive sulfide deposits Renzhixueshan Formation Shangdie rift basin |
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