神农架世界地质公园的中元古代叠层石

摘要

中元古代时期,神农架位于华南古陆,与澳大利亚古陆及西伯利亚古陆相邻,同处于罗迪尼亚超级大陆(Rodinia supercontinent)北部.其沿海的叠层石组合与澳大利亚古陆及西伯利亚古陆沿海的叠层石组合相似,显示了炎热气候下的碳酸盐岩台地潮坪浅水环境特征.常见的叠层石形态类型包括穹状、柱状、层柱状和层状等.主要有神农架大圆顶叠层石(Megadomia shennongjiaensis)、加尔加诺锥叠层石(Conophyton garganicum)、树桩圆柱叠层石(Colonnella cormosa)、简单包心菜叠层石(Cryptozoon haplum)、喀什喀什叠层石(Kussiella kussiensis)、圆柱朱鲁莎叠层石(Jurusania cylindrica)、地窖印卓尔叠层石(Inzeria intia)、瘤通古斯叠层石(Tungussia nodosa)、贝加尔贝加尔叠层石(Baicalia baicalica)、育卡贝加尔叠层石(Baicalia unca)、奥姆泰奥姆泰叠层石(Omachtenia omachtensis)和波层叠层石(Stratifera undata)等.%During the Mesoprototerozoic Era,South China craton where Shennongjia was located,adjoining Australian and Russian cratons,were all in northern Rodinia supercontinent.The stromatolites in coastal carbonate plateforms of these cratons were similar inassemblages.They formed in shallow water tidal flats and lagoons in a hot climate.The common stromatolites in the Shennongjia region are of domed,columnar,columnar-stratiform,stratiform types,etc.,such as Megadomia shennongjiaensis,Conophyton garganicum,Colonnella cormosa,Cryptozoon haplum,Kussiella kussiensis,Jurusania cylindrica,Inzeria intia,Tungussia nodosa,Baicalia baicalica,Baicalia unca,Omachtenia omachtensis and Stratifera undata,etc.