陆相下白垩统阜新阶重新厘定及其层型剖面

发布时间：2018-08-07 17:41

【摘要】：实测辽宁省建昌县冰沟剖面,选择其为单位层型;开展岩石地层、多门类生物化石和沉积相分析等系统研究,重新厘定陆相阜新阶定义。建昌冰沟组主要由砾岩、砂岩、泥岩和煤层组成,分成三个岩段,第二段为煤系地层。该组为陆相湖盆扇三角洲沉积体系,相序叠置分析属砂砾坝、分流河道、泥沙坪、泥炭沼泽和洪积平原等沉积环境。通过研究以叶肢介为主的化石发生和演变序列,及综合前人研究资料,阜新阶生物地层划分包括叶肢介组合带3个、孢粉化石组合2个、双壳类组合1个和介形虫组合2个。底界层型定在小冰沟村西单一浅湖相地层中,生物标志为叶肢介Orthestheropsis originalis的始现。依据孢粉和介形虫化石资料,阜新阶对比为国际地层表早白垩世巴列姆阶(Barremian)~阿尔必阶(Albian)。
[Abstract]:The Binggou section of Jianchang County Liaoning Province was measured and selected as unit layer. The definition of Fuxin stage of continental facies was redefined by systematic study of lithostratigraphy multi-family biofossils and sedimentary facies analysis. Jianchang Binggou formation is mainly composed of conglomerate, sandstone, mudstone and coal seam. This group is a continental lacustrine basin fan delta sedimentary system. The facies sequence superposition analysis belongs to sandy gravel dam, distributary channel, sediment flat, peat swamp and alluvial plain. By studying the sequence of fossil genesis and evolution mainly in phyllodes and synthesizing the previous research data, the biostratigraphic division of Fuxin is composed of 3 lamellar assemblages, 2 sporopollen fossil assemblages, 1 bivalve assemblage and 2 ostracods assemblages. The bottom boundary layer is defined in Xidan-shallow lacustrine facies of Xiaobingou Village, and the biomarker is the beginning of Orthestheropsis originalis. Based on the data of sporopollen and ostracoda fossils, Fuxin stage correlation is that the international stratigraphic surface early Cretaceous Barrem stage (Barremian) ~ Albim stage (Albian).
【作者单位】：中国地质科学院地质研究所;中国地质科学院矿产资源研究所;
【基金】：中国地质调查局和全国地层委员会项目(编号:1212011120142) 国家自然科学基金项目(编号:41472027;41572098)联合资助~~
【分类号】：P534.53

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