摘要
保存于华南新元古代晚期陡山沱组中的磷酸盐化化石被认为与后生动物起源、真核生物演化有重要联系。位于鄂西黄陵隆起北缘的樟村坪地区,是华南最重要的工业磷矿产地之一,主要磷矿层属于埃迪卡拉纪地层,却鲜有磷块岩化石报道。此次研究利用钻孔样品的大量连续切片,在陡山沱组磷矿层中发现了丰富的保存精美的微体化石,化石组合包括可能的动物胚胎化石Megasphaera inornata;大型具刺疑源类Appendisphaerasp.,Cymatiosphaeroides kullingii,Dicrospinasphaera sp.,Ericiasphaera magna,Weissiella sp.;多细胞藻类Wengania globosa,W.exquisite,Sarcinophycus papilloformis,Thallophyca sp.,以及球状丝状蓝藻化石Archaeophycus yunnanensis,Cyanonema majus,Salome nunavutensis,Obruchevella minor,Siphonophycus kestron,S.typicum,S.robustum,S.septatum。这些微体化石的发现丰富了该区磷酸盐化化石资料,同时该化石组合面貌与黔中地区陡山沱组上磷块岩"瓮安生物群"以及峡东陡山沱组典型硅化生物群都具有相似性,化石层位的探讨也为华南不同沉积相区陡山沱组的地层对比提供了新的参考依据。
The Ediacaran Doushantuo Formation of South China is world famous for its excellent preservation of phosphatized fossils.The Zhangcunping area,located in the northern limb of the Huangling anticline,is one of the key producing areas of phosphate in Neoproterozoic of China.However,there are only a few reports about phosphatized fossils from this area.Here we report a new phosphatized fossil assemblage from Doushantuo phosphate at the drillcore 407 in the northeastern Zhangcunping area,including animal embryos Megasphaera inornata,acritarchs Appendisphaerasp.,Cymatiosphaeroides kullingii,Dicrospinasphaera sp.,Ericiasphaera magna,Weissiella sp.,multicellular algae Wengania globosa,W.exquisite,Sarcinophycus papilloformis,Thallophyca sp.,coccoidal fossils Archaeophycus yunnanensis,and filamentous cyanobacteria Cyanone ma majus,Salome nunavutensis,Obruchevella parva,Siphonophycus kestron,S.typicum,S.robustum,S.septatum.These fossils add to the growing list of phosphatized Doushantuo taxa.The Zhangcunping fossil assemblage shows a close similarity to that of the Doushantuo Formation in the East Yangtze Gorges area and the upper phosphorites in Weng＇an,Guizhou Province.Moreover,these fossils can help to refine the biostratigraphic correlation of the Ediacaran Doushantuo Formation in the Yangtze Craton of South China.
出处
《古生物学报》
CAS
CSCD
北大核心
2015年第1期43-65,共23页
Acta Palaeontologica Sinica
基金
国家重点基础研究发展计划(编号:2011CB808800)
中国地质调查局地质调查工作项目(编号:1212011120787和12120114066301)联合资助
关键词
磷酸盐化化石组合
陡山沱组
埃迪卡拉纪
樟村坪
鄂西
Phosphatized fossil assemblage, Doushantuo Formation, Ediacaran, Zhangeunping, Hubei
