| 黔南独山县羊凤乡祥摆组海相动物群及其环境分析 |
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| 引用本文： | 罗威,熊发挥,石和.黔南独山县羊凤乡祥摆组海相动物群及其环境分析[J].西安地质学院学报,2011(4):354-357,396. |
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| 作者姓名： | 罗威 熊发挥 石和 |
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| 作者单位： | [1]成都理工大学沉积地质研究院,四川成都610059 [2]中海石油（中国）有限公司湛江分公司研究院,广东湛江524057 [3]中国地质科学院地质研究所,北京100037 |
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| 基金项目： | 中国地质调查局项目（1212010818037） |
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| 摘 要： | 黔南祥摆组的化石资料稀少且以植物化石为主，在独山县羊风乡祥摆组中发现了一个海相动物群，主要化石有腕足类、珊瑚类、苔藓虫类、头足类和遗迹化石，其中以腕足类最为丰富。在鉴定分析所发现化石的基础上，结合该动物群所在层位的岩性特征、矿物特征和区域上该时期的沉积特征，采用古生态学分析方法，认为该动物群生存环境为一个淡化渴湖。区域上，该渴湖主要位于平塘县与独山县之间，而构成渴湖与外海的障壁则主要位于摆者至麻尾一线东北，呈北西向延伸；在北部兔场附近祥摆组已演变为以泛滥平原沉积为主。溻湖范围内现今构造形态完整，同时这种局限低能的沉积环境可以形成良好的烃源岩，因此它们在区域上的分布对岩相古地理和油气生储盖组合研究具有重要意义。
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| 关 键 词： | 海相动物群 化石环境 古生态 溺湖 祥摆组 黔南地区 |
Marine Faura and Its Environmental Analysis of Xiangbai Formation in Yangfeng Village of Dushan County, South Guizhou |
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| Authors: | LUO Wei XIONG Fa-hui SHI He |
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| Institution: | 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Institute of Zhanjiang Branch Company, China National Offshore Oil Corporation Limited, Zhanjiang 524057, Guangdong, China; 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China) |
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| Abstract: | Xiangbai Formation was scarce of the fossil records which most parts were constituted of phytolite in South Guizhou. A marine fauna, which was comprised of the brachiopod, the coralline, the bryozoan, the cephalopod and the trace fossils, was discovered in Xiangbai Formation of Yangfeng Village of Dushan County. According to the lithologic, mineral and deposit characteristics of the neighborhood in the horizon of marine fauna, on the basis of the fossils＇ identify with the palaeoecology method, the results showed that the marine fauna lived in a desalted lagoon which mainly located between Pingtang County and Dushan County. The barriers of lagoon and open sea were mainly located in the northeast of Baizhe-Mawei with NW extension. In the north part, Xiangbai Formation had evolved with the main flood plain deposits near the Tuchang. The structure within the lagoon was complete, and the limited low-energy environment could form well hydrocarbon source rock. Therefore, the distribution has great significance on the study of lithofacies and paleogeography as well as the assemblage of the source-reservoir-seal association in oil and gas fields. |
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| Keywords: | marine fauna fossil environment palaeoecology lagoon Xiangbai Formation South Guizhou |
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