湖北峡东地区九龙湾剖面震旦系陡山沱组微体化石的新发现  

MICROFOSSILS DISCOVERED FROM THE SINIAN DOUSHANTUO FORMATION IN THE JIULONGWAN SECTION,EAST YANGTZE GORGES AREA,HUBEI PROVINCE,SOUTH CHINA

作　　者：解古巍[1,2] 周传明[1] McFadden K A 肖书海 袁训来[1] 

机构地区：[1]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,南京210008 [2]中国石油天然气股份有限公司长庆油田分公司勘探开发研究院,西安710021 [3]Department of Geosciences,Virginia Polytechnic Institute and State University,Blacksburg,VA 24061,USA

出　　处：《古生物学报》2008年第3期279-291,共13页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(Nos.40772021,40628002,40625006);科技部国家重点基础研究发展规划973项目(2006CB806401)联合资助

摘　　要：中国南方扬子地台震旦系陡山沱组产出丰富的微体化石,它们主要保存在磷块岩以及燧石结核和条带中。文章详细报道湖北峡东地区九龙湾剖面震旦系陡山沱组微体化石,描述以前未曾在峡东地区碳酸盐相燧石中发现的8属8种微体化石。研究九龙湾剖面陡山沱组大型带刺疑源类、微体多细胞藻类和动物胚胎化石的分布特征,发现Tianzhushania spinosa是最早出现的大型带刺疑源类分子,大冰期后微体生物的辐射是一个阶段性渐进的过程。同时,本项研究进一步证实华南扬子区陡山沱组碳酸盐相燧石和磷块岩地层中保存的微体化石面貌基本一致。Abundant microfossils have been discovered from ＂the Sinian Doushantuo phosphorites and chert nodules in South China. Here we report large ac anthomorphic acritarchs, micro algae and animal embryos from Doushantuo cherts at the Jiulongwan section in the eastern Yangtze Gorges area. Eight genera and 8 species are described for the first time in the eastern Yangtze Gorges area, including the micro-alga Sarcinophycus radiatus , acritarchs Cymatiosphaeroides kullingii , Ericiasphaera spjeldnaesii , Meghystrichosphaeridium chadianensis , Papillomembrana sp., and animal embryos Me gasphaera ornata , Megaclonophycus onustus, and Parapandorina raphospissa. Bed by bed sampling of chert horizons reveals a gradual diversification pattern of these microfossils in the lower Doushantuo Formation. This study further indicates that similar microfossil assemblages are preserved in Doushantuo phosphorites at Weng＇an and cherts in the eastern Yangtze Gorges area.

关 键 词：疑源类 燧石结核/条带 陡山沱组 峡东地区 

分 类 号：Q913[天文地球—古生物学与地层学]