湖北松滋下奥陶统红花园组生物群的生态及沉积环境

BIOTIC ECOLOGY AND DEPOSITIONAL ENVIRONMENTS OF LOWER ORDOVICIAN HONGHUAYUAN FORMATION IN SONGZI, HUBEI

刘秉理 朱忠德 罗柳忻 李建明

Liu Bingli Zhu Zhongde Luo Liuxin Li Jianming

湖北松滋县刘家场下奥陶统红花园组化石丰富,按生态特征可划分为亮相化石组合、礁相化石组合及滞流水体化石组合等三个生态组合,包括五个群落和埋藏群。其中礁相化石组合下部为蓝绿藻群落,上部为 - 群落,构成本区红花园组中、上部十分发育的岩隆礁。化石生态表明,本区在早奥陶世红花园期应处于低纬度区陆表海碳酸盐台地环境,大体上位于开阔台地至台地边缘相带。

Abundant fossils developed in the Lower Ordovician Honghuayuan Formation at Liujiachang,Songzi,Hubei.Based on their ecological characteristics,the fossils can be divided into three ecologic assemblages such as shelly facies fossil assemblage,reef facies fossil assemblage and perched-water facies fossil assemblage and five fossil communities or taphocoenosis.The reef facies fossil assemblages,in turn,can be subdivided into blue-green algae community at the lower part and the - community at the upper part.They constitute the well developed orgonic buildup in the mid and upperparts of the Honghuayuan Formation.According to biotic ecological and sedimentological analysis,Songzi region should be located in carbonate platform of low latitude epeiric sea,which correspond to open platform to marginal facies of the platform in general terms during the Early Ordovician Honghuayuan period.

10.11743/ogg19930405