桂林兴安拓村下石炭统黄金组生物地层研究  

Biostratigraphy of the Lower Carboniferous Huangjin Formation in Tuocun section in Xing′an County of Guilin

作　　者：陈贵英[1,2,3] 韩乃仁 周又敏[1,2] 郑昊 庞崇进 CHEN Gui-ying;HAN Nai-ren;ZHOU You-min;ZHENG Hao;PANG Chong-Jin(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,China;Guangxi Collaborative Innovation Centre of Hidden Non-Ferrous Metallic Ore Deposits Exploration and Development of Materials,Guilin University of Technology,Guilin 541006,China;Guangxi Science&Technology Normal University,Laibin 545004,China)

机构地区：[1]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541006 [2]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,广西桂林541006 [3]广西科技师范学院,广西来宾545004

出　　处：《桂林理工大学学报》2020年第1期55-59,共5页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41703039,41572191,41072018);广西自然科学基金项目(2015GXNSFCA139016)。

摘　　要：以桂林兴安拓村剖面下石炭统为研究对象,通过详细的野外剖面测量,采集并鉴定了珊瑚和腕足类化石,提出此剖面地层为下石炭统大塘阶黄金组上部,其顶部与寺门组整合接触。此剖面地层以灰岩、泥质灰岩为主,向上渐变为泥灰岩、泥岩和页岩互层,富含珊瑚和腕足类化石,同时含有少量三叶虫、菊石、海百合茎等化石,反映了浅海沉积环境。珊瑚化石主要是Kueichouphyllum-Auloclisia组合带,腕足类以Pugilis和Vitiliporductus为主。此剖面地层在层位上完全可与贵州威宁鸭子塘组对比,但岩相和化石略有区别(无Thysanophyllum),可能与兴安地区早石炭世水体含泥量较高有关。A global sea-level fall was well recorded from Upper Devonian-Lower Carboniferous strata in South China by numerous studies. Tuocun section of Lower Carboniferous strata in Xing′an was measured in this study. Anthozoa and brachiopoda fossils were collected and identified in the field. According to the paleontological data, strata in the measured section is assigned to the upper part of the Lower Carboniferous Huangjin Formation, which is conformably overlain by the Lower Carboniferous Simen Formation. The upper part of the Huangjin Formation is mainly composed of limestone and muddy limestone, with interbedded marl, mudstone and shale on the top. Although the Huangjin Formation is dominated by anthozoa and brachiopoda, there are also trilobites, ammonoids and broken crinoid stems, indicating a shallow-marine depositional environment. The anthozoa is mainly of the assemblage Kueichouphyllum-Auloclisia, whereas the brachiopda mainly Pugilis and Vitiliporductus. Therefore, the measured strata of the Huangjin Formation in the Tuocun section can be correlated with the Yazitang Formation in Weining County of Guizhou Province. However, Thysanophyllum is absent in the Tuocun section, which may be related to an increasing muddiness of the depositional environment.

关 键 词：下石炭统 黄金组 Kueichouphyllum-Auloclisia组合带 兴安 广西 

分 类 号：P534.45[天文地球—古生物学与地层学]