贵州遵义松林寒武纪早期牛蹄塘生物群埋藏学特征初探  

PRELIMINARY TAPHONOMIC ANALYSES OF THE EARLY CAMBRIAN NIUTITANG BIOTA NEAR SONGLIN,ZUNYI,GUIZHOU

作　　者：崔滔[1] 杨兴莲[1,2] 赵元龙[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550003 [2]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

出　　处：《古生物学报》2010年第2期210-219,共10页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(40902003);国家重点基础研究发展计划(2006CB806401);贵州省科技特别基金项目(黔科机字2007-4004);贵州大学博士点(矿物;岩石;矿床学)建设基金项目资助

摘　　要：通过系统发掘发现遵义松林寒武纪早期牛蹄塘生物群自下而上存在3个化石富集层:锐虾Perspicaris富集层、海绵动物富集层和带有澄江生物群色彩的三叶虫、楔叶形虫Sphenothallus富集层。牛蹄塘生物群化石保存完整、分选性差、无明显的定向性、缺少软躯体化石和底内生物,结合岩性、地球化学、构造等特征综合认为牛蹄塘生物群是弱水动力作用下缓慢沉积的原地埋藏群落。牛蹄塘组沉积时期曾有过多次充氧事件,水体氧化时间的长短以及底层水氧化-还原界面的差异导致了不同的生物组合。The early Cambrian Niutitang biota is wide-spread in the basal Cambrian black shales in Guizhou and Hunan provinces, South China.Through systematic excavation of the Niutitang Biota at the Heishapo section, near Songlin, Zun-yi, three fossil-rich layers have been recognized. In the ascending order, there are Perspicaris layer, sponge layer and trilobites, and a Sphenothallus layer similar to the Chengjiang Biota. Based on the taphonomic analyses of more than 1000 specimens, it is demonstrated that fossils of the Niutitang biota are predominantly preserved as skeletons or carapaces without sorting, articulated lacking preservation of soft-tissues and structure. No bio-turbation and endobenthos have been founded in the biota. Together with information of lithology, geochemistry and sedimentary structures, we considered that the Niutitang biota is an in-situ buried community under a quiet, poor oxygen bottom water condition with slow deposition. There had been many oxygenation events happened during the sedi-mentary period of Niutitang Formation, however, the length of oxidated time and the differences of redox interface led to the formation of different bio-assemblages.

关 键 词：埋藏学 牛蹄塘生物群 寒武纪 贵州 

分 类 号：Q912[天文地球—古生物学与地层学]