造礁生物群落演化在海平面变化研究中的运用—以中扬子台地下奥陶统红花园组生物礁为例  

Application of Reef building Organism Community Evolution in Sea Level Change Research —An example from reef of Honghuayuan Formation of Lower Ordovician in the Central Yangtze Platform

作　　者：杨威[1] 朱忠德[2] 刘秉理[2] 肖传桃[2] 

机构地区：[1]石油勘探开发研究院廊坊分院天然气地质所,河北廊坊065007 [2]江汉石油学院地质系,湖北荆州434102

出　　处：《沉积学报》2001年第1期55-59,共5页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目! (批准号 :49372 1 1 6)

摘　　要：中扬子台地下奥陶统红花园组造礁生物群落主要有五种 :蓝绿藻群落 (S群落 )、Calathium 蓝绿藻群落 (C S群落 )、Batostoma—Calathium群落 (B C群落 )、Archaeoscyphia—Calathium群落 (A C群落 )和Batostoma—Calathi um 蓝绿藻群落 (B C S群落 )。群落的演化模式有两种 :①A C群落 /B C群落→C S群落 /B C S群落→S群落 ;②S群落→C S群落 /B C S群落→A C群落 /B C群落 ,它们分别对应于上下两期生物礁。群落最大的生态差别可能是其最适合的水深 ,说明其演化的主要动力可能是相对海平面的变化 ,根据各群落适应的水深特征 ,可推测红花园建礁期为一个海平面下降到上升的一个过程 ,相对海平面变化的最大幅度约为 15m。生物礁内生物群落的演化是海平面变化的灵敏示踪剂 ,可识别A lot of reefs have been discovered in Honghuayuan Formation of Lower Ordovician in the Central Yangtze Platform. Their rock comparisons contain two types. One is baffle stone. Another is binding stone. Their reef building organisms contain five types.They are bluegreen alga (containing blue bacterium and Girvanella ), Calathium, Batostoma, Pulchrilamina , and Archaeoscyphia as representation of rock sponge. They composite five types of reef-building organism community. Is bluegreen alga community (S community), Calathium bluegreen algae community (C S community), Archaeoscyphia Calathium community (A C community), Batostoma Calathium community (B C community), Batostoma Calathium bluegreen algae community (B C S community). Ecological environment of each of reef building organism community and the most lithofacies assemblage of host rock may indicate characteristics of each community,which includes water body environment and the most depth range suitable. Each community can adapt normal shallow sea of warm, clean, rich sunshine and oxygen, and cyclic better. But the most suitable depth may be different. S community represents shallow water and small energy. C S community and B C S community may be 5～10 m and medium large water energy. B C community and A C community may be 10～20 m and large water energy. Organism belt has been discovered in reefs of thickness over 5m in the study area. Organism belt is a result of organism community evolution,and is the most intuitive evidence of organism community evolution. Organism belt within reefs from bottom to up may indicate two models of community evolution. The trend of their evolution is ①A C community or B C community→C S community or B C S community→S community, ②S community→C S community or B C S community→A C community or B C community. This is an entire course of community from growth to death. Organism richness of community interior has also been changed with time. Because the most

关 键 词：造礁生物群落 演化模式 海平面变化 生物礁 下奥陶统 

分 类 号：P588.248[天文地球—岩石学] P736.22[天文地球—地质学]