| 滇西施甸地区卧牛寺组火山岩的地质时代及喷发环境 |
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| 作者姓名： | 郝家栩 邹立志 陈刚 黄勇 |
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| 作者单位： | (1.贵州省地质调查院，贵阳 550005； 2.贵州省地质矿产勘查开发局地球物理地球化学勘查院，
贵阳 550018; 3.贵州省地质矿产勘查开发局一一四地质大队，遵义 563009) |
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| 摘 要： | 前人将施甸地区卧牛寺组火山岩与北部保山地区卧牛寺组火山岩等同起来，认为是海相喷发的产物。本次调查工作揭示，施甸地区卧牛寺组缺乏沉积夹层，与北部保山地区卧牛寺组火山岩喷发环境存在明显差异，其岩石学、地球化学、宏观地质特征均表明，施甸地区卧牛寺组火山岩具大陆溢流相喷发机制，为陆相喷发产物。同时，年龄测定结果（264 Ma）及其与下伏和上覆地层的接触关系表明，卧牛寺组火山岩的喷发时期为早二叠世，为卧牛寺组地质时代的确定提供了重要依据。
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| 关 键 词： | 火山岩 卧牛寺组 喷发环境 喷发时期 滇西 |
Age and Eruption Environment of Volcanic Rock from Woniusi#br#
Formation in Shidian,Western Yunnan Province |
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| Authors: | HAO Jia-xu ZOU Li-zhi CHEN Gang HUANG Yong |
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| Institution: | (1.Guizhou Geological Survey, Guiyang 550005, China; 2.Guizhou Institute of Geophysical and Geochemical Prospecting, Bureau of ;
Geology and Mineral Exploration and Development of Guizhou Province, Guiyang 550018, China; 3.114 Geological Party, ;
Guizhou Bureau of Geology and Mineral Exploration and Development， Zunyi 563009, China) |
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| Abstract: | In previous studies on volcanic rock of Woniusi Formation in Shidian region, some researchers have proposed it has close relation with the marine volcanic activity as in Baoshan region, north Yunnan Province. However, the inexistence of sediment strata and characteristics of petrology, geochemistry and geology indicate that the eruption environment is significantly different between the two regions. It is showed that the Woniusi Formation form in continental eruption setting and associated with the continental flood magma in Shidian region. In addition, the age (264 Ma) of volcanic rock from Woniusi Formation and the contact relationship with upper and lower strata suggest the Woniusi Formation might be formed in Early Permian, and these provide new evidence for the formation age of Woniusi Formation. |
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| Keywords: | volcanic rock Woniusi Formation eruption environment erupting-time western Yunnan Province |
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