| 青海南部早二叠世火山-沉积背景的岩石地层序列 |
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| 引用本文： | 牛志军,段其发,王建雄,何龙清,白云山.青海南部早二叠世火山-沉积背景的岩石地层序列[J].地球科学,2010,35(1). |
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| 作者姓名： | 牛志军 段其发 王建雄 何龙清 白云山 |
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| 作者单位： | 中国地质调查局宜昌地质调查中心; |
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| 基金项目： | 国家自然科学基金(No.40972006);;国土资源大调查(Nos.1212010911035,200213000003);;2008年度国土资源部“百名优秀青年科技人才”资助 |
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| 摘 要： | 研究区位于青海南部长江源区,大地构造上属东特提斯构造域,为金沙江结合带与澜沧江结合带间昌都地块的一部分.青海南部二叠系沉积类型复杂,多呈断块(片)状出露,尤其是受火山事件影响的下二叠统.关于下二叠统(乌拉尔统)的对比及地层划分目前仍存在较多争议,认识的不同点主要集中于火山岩的层序归属、地质时代、区域对比等.以实测剖面为基础,系统调查岩石地层的岩性组合、沉积环境等,通过着重于各地层单位(尤其是火山岩系)的生物群研究,重新厘定火山-沉积背景下的岩石地层序列.■类动物群的研究表明诺日巴尕日保组和九十道班组在青海南部地区具穿时性.地层序列的建立表明青海南部早二叠世早期为较稳定的浅灰色中厚层状碳酸盐岩.罗甸期强烈的火山喷发,形成了特殊火山-沉积地貌,对沉积古地理格局形成明显的制约,沉积相变快,可划分为4种沉积类型,形成同期异相的诺日巴尕日保组和尕笛考组.自祥播期之后,主要为一套厚层状生物屑灰岩(九十道班组),在青海南部分布较广,代表火山活动暂时停止后的台地相沉积,罗甸期复杂的古地理格局,至此则构成相对统一的较稳定的浅水碳酸盐岩台地.
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| 关 键 词： | 二叠系 ■类 岩石地层 地层学 青海 |
Early Permian (Cisuralian) Lithostratigraphical Succession in Volcanic-Sedimentary Setting from Southern Qinghai |
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| NIU Zhi-jun,DUAN Qi-fa,WANG Jian-xiong,HE Long-qing,BAI Yun-shan.Early Permian (Cisuralian) Lithostratigraphical Succession in Volcanic-Sedimentary Setting from Southern Qinghai[J].Earth Science-Journal of China University of Geosciences,2010,35(1). |
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| Authors: | NIU Zhi-jun DUAN Qi-fa WANG Jian-xiong HE Long-qing BAI Yun-shan |
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| Abstract: | The studied area is situated at the origin of the Yangtze River in the Tanggula Mountain of southern Qinghai, which was a part of the Qamdo Block of the East Tethyan tectonic domain during the Late Palaeozoic and is bounded by the Jinshajiang suture to the north and the Lantsang-Lungmo Co suture to the south. The Permian strata is widespread in the area with various sedimentary facies, and separated by numerous and complicated faults, especially Lower Permian influenced by volcanic activity. As a result of ... |
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| Keywords: | Permian fusulinid lithostratigraphical succession stratigraphy Qinghai |
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