| 羌塘盆地中部上三叠统“甲丕拉组”沉积演化及研究意义 |
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| 引用本文： | 汤朝阳,吴健辉,王国强,赵武强,王建雄.羌塘盆地中部上三叠统“甲丕拉组”沉积演化及研究意义[J].大地构造与成矿学,2011,35(3):421-428. |
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| 作者姓名： | 汤朝阳 吴健辉 王国强 赵武强 王建雄 |
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| 作者单位： | 1. 武汉地质矿产研究所,湖北武汉,430223
2. 湖北国土资源职业学院,湖北荆州,434000 |
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| 基金项目： | 国家自然科学基金，上扬子铅锌矿床与岩相古地理关系研究项目 |
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| 摘 要： | 通过区域对比,根据岩石类型及其组合(岩性、颜色、层型、颗粒类型)、沉积旋同垂向序列、地质体几何形态、层内和层面的结构构造特征及其变化、生物类型及其组合、自生矿物和地球化学等相标志,将羌塘盆地中部甲丕拉组沉积相划分为大陆相区的洪积相、河流相,过渡相区的三角洲相和海洋相区的潮坪相、局限海台地相、沿岸沙坝相、火山喷发相和台地...
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| 关 键 词： | 沉积相 石膏矿 上三叠统 甲丕拉组 羌塘 |
Sedimentary Evolution of the Upper Triassic Jiapila Formation at the Middle Qiangtang Basin and its Geological Significance |
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| TANG Zhaoyang,WU Jianhui,WANG Guoqiang,ZHAO Wuqiang,WANG Jianxiong.Sedimentary Evolution of the Upper Triassic Jiapila Formation at the Middle Qiangtang Basin and its Geological Significance[J].Geotectonica et Metallogenia,2011,35(3):421-428. |
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| Authors: | TANG Zhaoyang WU Jianhui WANG Guoqiang ZHAO Wuqiang WANG Jianxiong |
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| Institution: | 1(1.Wuhan Institute of Geology and Mineral Resources,Wuhan 430223,Hubei,China;2.Hubei Land Resources Vocational College,Jingzhou 434000,Hubei,China) |
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| Abstract: | Based on the facies marks including sediment-style and assemblages(lithology,color,strata type,grain type),vertical depositional features,fabric and construct characters,and biotic assemblages as well as authigenic mineral and geochemical characteristics,9 types of sedimentary facies in the Jiapila Formation within Yangtze source region can be recognized:pluvial facies,fluvial facies,detal facies,tidal flat facies,subtidal facies of restricted platform,longshore bar facies and volcanic eruption facies,as well as platform marginal facies.The bivalves fossil of Quemocuomegalodon sp.and Neomegalodon cf.ampezzanus(Hoernes) as well as gypsum deposit were discovered in the restricted platform.Moreover,barite,fluorite and other minerals were found in the gypsum deposition;therefore,all of these suggest that the deposit of lazurite,barite and fluorite are the prospecting potential in the restricted platform facies.The biologic features and sedimentary characteristics of the Jiapila Formation suggest that it was sedimented in shallow-water environment with high rate of evaporation.The new data on the sedimentary facies of the formations provide important information to understand the regional tectonic-paleogeographic environment during the Indosinian movement. |
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| Keywords: | sedimentary facies gypsum deposit Upper Triassic Jiapila Formation |
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