摘要
在系统鉴定各时代放射虫化石的丰度、种属组合、化石分异度和生态结构特征的基础上，讨论了鉴别放射虫生态环境的主要标志，划分出了５种放射虫生态环境，即水深５０～２００ｍ的浅海环境，水深２００～１０００ｍ的中深海环境，水深大于１０００ｍ的深海环境，以及局限裂谷槽环境和连通性裂谷槽环境。华南海西印支阶段各时代的放射虫化石构成了３个演替旋回：中泥盆世至早石炭世演替旋回反映了残留海槽的再扩张过程；中二叠世演替旋回代表了开阔伸展裂谷海环境；晚二叠世至中三叠世的放射虫组合构成了一个由龙潭期局限裂谷槽，到长兴期连通性裂谷槽，再到早、中三叠世开阔深海型化石组合。
Abstract Based on the study of radiolarian abundance,fossil differentiation,genus and species assemblage and bioecologic texture,the main indicators for recognizing the radiolarian bioecologic environment were discussed.The radiolarian habitats of South China during HercynianIndosinian could be classified into 5 types:(1)shallow sea habitat type of 50-200 m water depth,(2)simedeep sea habitat type of 200-1 000 m water depth,(3)deep sea environment with more than 1 000 m water depth,(4)restrict rift sea habitat type of 50-200 m water depth,and(5)connected rifted sea habitat type of more than 200 m water depth. The radiolarian could be divided into three succession cycles according to the evolution of radiolarian assemblages in every stratigraphic unit.The radiolarian succession cycle of Middle DevonianEarly Carboniferous reflects a respreading process of the relict ocean trough.The Middle Permian radiolarian succession shows a open rifted oceanic environment.The radiolarian succession cycle of Late PermianMiddle Triassic indicates a development process of restricted rift trough→connected rift trough→open deep ocean .
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1998年第2期124-131,共8页
Oil & Gas Geology
基金
国家自然科学基金
