摘要
首次发现峡东下奥陶统生物礁。造礁生物为攀苔藓虫、托盘藻、古钵海绵、蓝细菌和Pulchrilamina等。按造礁生物形成的格架类型有:粘结粒泥岩,藻粘结岩,攀苔藓虫障积岩,粘结障积岩等4种礁岩微相。这些微相在礁核中有、无和分布差异形成了灰泥岩隆礁,藻岩隆礁,攀苔藓虫障积岩隆礁和藻粘结-古钵海绵障积岩隆礁。各类礁都经历了奠基、发育、衰亡3个阶段。这一演化过程反映了沉积环境和水能量强度对礁发育的制约作用。
The Lower Ordovician organic reefs were first identified in Huanghuachang of the eastern Yangtze Gorge by the authors. The reef-buildup organism are mainly Baostoma, Cala-thium, Archeoscyphia, Cyanobacieria and Pulchriamina etc. There are roughly four types of microfacies: bound wackestone, algae bindstont.Batostoma bafflestone and binding bafflestone according to the framework types formed by the reef-buildup organism. The existence, absence and distributive differences of these microfacies in reef core respectively formed limemud buildup reef, algae buildup reef, Batostoma baffling buildup reef and algae bind-Archaeos-cyphia baffling buildup reef. And each reef has urdergone foundation stage, development stage and decline stage. These processes of the evolution have reflected the control of sedimentary environments and the intensity of water energy on the devolopment of reefs.
出处
《地质科学》
CAS
CSCD
北大核心
1993年第1期1-9,T001,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
奥陶纪
生物礁
攀台藓虫
长江
The Eastern Yantze Gorge, Baffling buildup reef, Batostoma, Reef-bui-dup organism, Foundation stage
