| 长江源各拉丹冬一带晚三叠世那底岗日组 |
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| 引用本文： | 李莉,牛志军,白云山,姚华舟,段其发.长江源各拉丹冬一带晚三叠世那底岗日组[J].地层学杂志,2012(1):49-54. |
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| 作者姓名： | 李莉 牛志军 白云山 姚华舟 段其发 |
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| 作者单位： | 武汉地质矿产研究所 |
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| 基金项目： | 国土资源大调查项目(No.1212010911035);国家自然科学基金项目(No.40972006);2008年度国土资源部百名优秀青年科技人才计划项目资助 |
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| 摘 要： | 长江源各拉丹冬一带那底岗日组，为一套基-中酸性的火山岩或火山碎屑岩-沉积岩组合，其上与中侏罗统雀莫错组不整合、与下晚三叠世巴贡组整合接触，火山岩u—Pb同位素年龄为212±1．7Ma，时代为晚三叠世诺利晚期-瑞替期，为晚三叠世拉竹龙-金沙江洋盆？向南消减形成的火山岩浆弧。
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| 关 键 词： | 岩石地层 火山岩 那底岗日组 晚三叠世 各拉丹冬 青海 |
VOLCANIC ROCKS OF THE LATE TRIASSIC NADIGANGRI GROUP OF THE GELADANDONG AREA,SOURCE REGION OF YANGTZE RIVER |
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| LI Li,NIU Zhi-jun,BAI Yun-shan,YAO Hua-zhou and DUAN Qi-fa.VOLCANIC ROCKS OF THE LATE TRIASSIC NADIGANGRI GROUP OF THE GELADANDONG AREA,SOURCE REGION OF YANGTZE RIVER[J].Journal of Stratigraphy,2012(1):49-54. |
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| Authors: | LI Li NIU Zhi-jun BAI Yun-shan YAO Hua-zhou and DUAN Qi-fa |
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| Institution: | Wuhan Institute of Geology and Mineral Resources,Wuhan 420305 |
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| Abstract: | The Nadigangri Group of the Geladandong area in the source region of Yangtze River,is composed of basic and intermediate-felsic volcanic rocks and/or volcaniclastic-sedimentary rocks.It is separated from the overlying Middle Jurassic Quemocuo Group by an angular unconformity,and is underlainconformably by the Late Triassic Bagong Group.U-Pb isotopic geochronologic analysis of volcanic rocks from the Nagangri Group yielded an age of 212 ± 1.7 Ma.The Naganri Group is considered to be late Norian and Rhaetian,and the Norangri volcanic rocks are interpreted to have formed through arc magmatism triggered by southward subduction of Lazhulong-Jingshajiang Ocean Crust. |
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| Keywords: | lithostratigray volcanic rock Nadigangri Group Late Triassic Geladandong Qinghai |
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