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南秦岭略阳地区略阳组牙形刺新材料及其时代意义 被引量:1

CONODONTS FROM THE LUEYANG FORMATION IN LUEYANG AREA, SOUTH QINLING MOUNTAIN, CHINA AND THEIR AGE SIGNIFICANCE
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摘要 略阳组分布于南秦岭勉略缝合带附近,是略阳地区重要的岩石地层单元。本次研究在略阳灵岩寺南部剖面的略阳组获得牙形刺13枚,共识别出3属5种,包含2亚种和2未定种,分别为:Siphonodella homosimplex,Polygnathus communis communis,Po.inornatus inornatus,Po. sp.和Pseudopolygnathus sp.。该牙形刺组合可以与华南同时期牙形刺进行对比,时代为早石炭世杜内期早期,这为确定略阳组的下部层位的具体时代提供了新的牙形刺证据。略阳组中所产出的Si.homosimplex为华南地区浅水相牙形刺的典型代表,Po.inornatus inornatus广泛见于西欧的浅水相地层,这表明在早石炭世期间勉略地区为浅水碳酸盐岩台地沉积环境,且与华南地区生物区系存在紧密联系,同前人根据底栖生物化石研究得出的结论相一致。 The carbonate-dominated and fossiliferous Lueyang Formation is stratigraphically important for the Mian-xian—Lueyang area,Shaanxi Province,which is located in the middle part of the Central Orogenic Belt in China.Thirteen conodont specimens have been obtained from the Lueyang Formation at the South Lingyan temple section.Five species belonging to three genera(including two subspecies and two indeterminate species)are present.This conodont fauna is composed of Siphonodella homosimplex,Polygnathus communis communis,Po.inornatus inornatus,Po.sp.and Pseudopolygnahtus sp..The Lueyang fauna can be biostratigraphically correlated with the earliest Carboniferous stratigraphic sections in South China,suggesting an early Touranisian age of the Early Carboniferous.This condont biostratigraphy provides age dating of the lower part of the Lueyang Formation.The most stratigraphically important Si.homosimplex yielded in the Lueyang Formation characterizes a typical shallow-water setting in south China,while the other age-diagnostic taxon in the Lueyang conodont assemblage,Po.inornatus innornatus,has been widely reported from the shallow-water carbonates of West Europe.All these suggest that the Lueyang area was located on a shallow water carbonate platform and had a close relation with the South China Bioprovince during the Early Carboniferous.This result is consistent with previous conclusions drawn based on benthic fossil groups.
作者 杨志华 王训练 周洪瑞 景秀春 沈阳 于子栋 杨运军 石颖 YANG Zhihua;WANG Xunlian;ZHOU Hongrui;JING Xiuchun;SHEN Yang;YU Zidong;YANG Yunjun;SHI Ying(School of Earth Sciences and Resources,Chinese University of Geosciences(Beijing),Beijing 100083;Museum,Chinese University of Geosciences(Beijing),Beijing 100083;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;Shaanxi Geological Survey Center,Xi’an 710068)
出处 《微体古生物学报》 CSCD 北大核心 2019年第1期87-96,共10页 Acta Micropalaeontologica Sinica
基金 国家自然科学基金项目(41702023 41502026) 陕西省勉略宁地区基础地质调查项目(公益[2015]01-02) 现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金(173122) 中国地质大学(北京)中央高校基本科研业务费项目联合资助~~
关键词 牙形刺 略阳组 石炭纪 南秦岭 陕西 Conodont Lueyang Formation Carboniferous South Qinling Mountain Shaanxi Province China
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