| 西藏塔惹增地区上石炭统—下二叠统拉嘎组火山岩夹层的发现及其地质意义 |
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| 引用本文： | 马德胜,熊兴国,曾禹人,符宏斌,郭 海.西藏塔惹增地区上石炭统—下二叠统拉嘎组火山岩夹层的发现及其地质意义[J].地质通报,2015,34(9):1636-1644. |
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| 作者姓名： | 马德胜 熊兴国 曾禹人 符宏斌 郭 海 |
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| 作者单位： | 1.中国地质大学，湖北 武汉 430074；2.贵州省地质调查院，贵州 贵阳 550018 |
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| 基金项目： | 中国地质调查局项目（编号：1212011086035、1212011121230） |
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| 摘 要： | 冈底斯带广泛分布晚古生代火山岩地层。岩石学、地球化学特征表明,冈底斯带的构造属性在晚古生代已经发生转变。在冈底斯带中西部塔惹增地区晚石炭世—早二叠世拉嘎组中发现了火山岩夹层。根据岩石地球化学特征分析,该火山岩属岛弧环境,标志着晚古生代冈底斯发生首次造弧作用,该时期冈底斯中西部已经由被动大陆边缘向主动大陆边缘转化。
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| 关 键 词： | 塔惹增地区 冈底斯 火山岩 岛弧环境 |
The discovery of volcanics intercalation in Upper Carboniferous-Lower Permian Laka Formation, Tarezeng area, Tibet |
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| MA Desheng,XIONG Xingguo,ZENG Yuren,FU Hongbin,GUO Hai.The discovery of volcanics intercalation in Upper Carboniferous-Lower Permian Laka Formation, Tarezeng area, Tibet[J].Geologcal Bulletin OF China,2015,34(9):1636-1644. |
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| Authors: | MA Desheng XIONG Xingguo ZENG Yuren FU Hongbin GUO Hai |
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| Institution: | 1. China University of Geosciences, Wuhan 430074, Hubei, China;2. Guizhou Academy of Geological Survey, Guiyang 550018, Guizhou, China |
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| Abstract: | Late Paleozoic volcanic strata are widely distributed in the Gangdise belt. Petrological and geochemical characteristics show that remarkable change of the Gangdise belt had already taken place in late Paleozoic. The authors found volcanics intercalation in Late Carboniferous-Early Permian Laka Formation within Tarezeng area along central and western segment of the Gangdise belt. Petrological and geochemical characteristics show that it belonged to an island arc environment and marked the first arc-producing action of the Gangdise belt that took place in Late Paleozoic. During that period, central and western segment of the Gangdise belt had already experienced the conversion from the passive continental margin to active continental margin. |
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| Keywords: | Tarezeng area Gangdise volcanic rock island arc environment |
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