鄂西神农架地区莲花剖面陡山沱组疑源类新材料及其生物地层学意义  

NEW ACANTHOMORPHIC ACRITARCH MATERIALS FROM THE DOUSHANTUO FORMATION AT THE LIANHUA SECTION,SHENNONGJIA AREA,WESTERN HUBEI PROVINCE AND THEIR BIOSTRATIGRAPHIC SIGNIFICANCE

作　　者：陈依洁 欧阳晴 周传明[1,3] 史红毅 孙云鹏 陈哲 CHEN Yijie;OUYANG Qing;ZHOU Chuanming;SHI Hongyi;SUN Yunpeng;CHEN Zhe(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;University of Chinese Academy of Sciences,Beijing 100049;University of Chinese Academy of Sciences,Nanjing,Nanjing 211135;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026)

机构地区：[1]古生物学与油气地层应用全国重点实验室,中国科学院南京地质古生物研究所,南京210008 [2]中国科学院大学,北京100049 [3]中国科学院大学南京学院,南京211135 [4]中国科学技术大学地球和空间科学学院,合肥230026

出　　处：《微体古生物学报(中英文)》2024年第4期279-304,共26页Acta Micropalaeontologica Sinica

基　　金：国家重点研发计划青年科学家项目(2022YFF0802700、2021YFA0718100);国家自然科学基金(42272012、41902006、41672027);古生物学与油气地层应用全国重点实验室基础研究课题(20232103)共同资助。

摘　　要：本文报道在鄂西神农架地区莲花剖面埃迪卡拉系陡山沱组二段顶部燧石结核中发现的微体化石,包括大型具刺疑源类17属35种。其中,3属(Tianzhushania,Xenosphaera和Yinitianzhushania)和8种(Appendisphaera longitubularis,Hocosphaeridium anozos,Mengeosphaera flammelata,Sinosphaera speciosa,Tanarium triangulare,Tianzhushania spinosa,X.liantuoensis及Y.tuberifera)具刺疑源类是本研究在该地区新发现的类型,这些发现丰富了对华南扬子板块台地相区埃迪卡拉纪早期具刺疑源类组成的认识。结合前人发表资料,本研究总结了具有特殊生物地层学意义的具刺疑源类Tianzhushania属在扬子板块不同相区和剖面的首现层位、相对丰度及形态特征的变化,并讨论了这些变化在生物地层学应用中可能产生的影响。同时,本研究再次证实Tianzhushania spinosa与Hocosphaeridium anozos共存于陡山沱组二段地层中,并发现二者的相对丰度在纵向上可能存在“此消彼长”的变化,说明仅利用化石首现层位定义的延限带可能不足以真实反映其连续渐变的演化序列,而不同相区、不同地点具刺疑源类在纵向上相对丰度的变化可能在其生物地层学应用中起到更大的作用。We report 17 genera and 35 species of acanthomorphic acritarchs found from the Member II chert nodules of the Ediacaran Doushantuo Formation at the Lianhua Section,Shennongjia area,western Hubei Province.Among these acritarchs,three genera(Tianzhushania,Xenosphaera and Yinitianzhushania)and eight species(Appendisphaera longitubularis,Hocosphaeridium anozos,Mengeosphaera flammelata,Sinosphaera speciosa,Tanarium triangulare,T.spinosa,X.liantuoensis and Y.tuberifera)are reported for the first time from this region,adding new data to the composition of the Ediacaran acanthomorphic acritarchs in the inner shelf carbonate platform facies of South China.Combined with previously published data,we summarize the spatial variations of stratigraphic range,relative abundance change and morphological characteristics of Tianzhushania spinosa,which is of special biostratigraphic significance,and discuss the influence of these spatial variations on its biostratigraphic applications.Meanwhile,our findings confirm the co-occurrence of Tianzhushania spinosa and Hocosphaeridium anozos in the Member II of the Doushantuo Formation,and together with the presently available data,show an upsection increase in relative abundance of Hocosphaeridium anozos accompanied by the decrease in relative abundance of Tianzhushania spinosa.This study indicates that the range biozones defined by only the first appearance datum(FAD)of species cannot fully reflect the more complex evolutionary process,and the stratigraphic change of relative abundance of the acanthomorphic acritarchs in different sections may play a more important role in the Ediacaran biostratigraphy.

关 键 词：具刺疑源类 生物地层 陡山沱组 埃迪卡拉系 神农架地区 

分 类 号：Q913[天文地球—古生物学与地层学]