四川黄龙地区晚泥盆世—早二叠世古群落分析

Paleocommunity analysis of the Late Devonian-Early Permian in the Huanglong area,Sichuan,China

四川黄龙地区晚泥盆—早二叠世含丰富的生物化石,可划分出6个古生物群落。通过对个体生态、营养结构的分析及围岩和生物组合特征的研究表明:Gigantoproductus gianteus群落和Choristites群落为不成熟群落,环境属台地边缘;Triticites-Pseudoschwagerina群落和Verbeekina群落为成熟生物群落,Parafusulina-Schwagerina群落和Dictyoclostus-Schellwienella群落为较成熟群落,均属开阔台地生态环境。各群落在时间上相互取代主要受控于海水深度、海水持续缓慢变化导致的环境渐变,属缓慢环境变化型取代。结合各群落古生态环境及群落取代关系,建立了生态环境模式。

Abundant biological fossils organisms in Late Devonian-Early Permian were collected in the Huanglong area of Sichuan, and 6 paleocommunities were recoginized. The research obtains different conclusions by analysing the individual morphology, trophic structure, lithology and bieta facies. First, Gigantoproductus glanteus community and Choristites community are immature community and the environment belongs to the marginal platform. Second, Triticites-Pseudoschwagerina community and Verbeekina community are the mature community. Parafusulina- Schwagerina community and Dictyoclostus-Schellwienella community are relatively mature community. These belongs to open platform. Every community is replaced with each other in the time, which is controlled by the sea depth. Because the slow change of the sea depth can lead to environmental gradation, so it belongs to the replacement of the environment changing slowly. The last ecological environment model is set up combined with the every peleoecologic environment and the relation of community replacement.