摘要
本文第一次报道并研究了皖北震旦系张渠组碳酸盐风暴沉积相序;第一次在张渠组的远源风暴浊流序列中发现大量三射钙质海绵骨针,从古生物角度再次提供了华北与华南震旦系对比的证据。
The carbonate sequence of the Sinian Zhongqu Formation in northern Anhui has been studied from a view-point of genetic stratigraphy, and five facies have been distinguished, i.e. carbonate shelf, ramp, stromatolitic reef on the edge of a platform, oolitic shoal and tidal flat facies. The dynamic storm greatly transformed the original facies. Autochthonous, proximal and distal storm deposits may be distinguished from the carbonate sequences. The basic rock types of the distal storm turbidity deposits are various kinds of platy micrite with graded bedding. Sponge-spicules were for the first time found at the bottom of the turbidity graded bed in terminal Precambrian sequences in North China, which provides palaeontological evidence for the correlation with the Sinian System in South China.The Zhangqu Formation is an upward shallowing carbonate prograding sequence. The storm pattern in the Zhangqu Formation is of significance for the study of the late Precambrian carbonate sections which develop in the interior of the plate and on which terrigenous deposits have limited effects.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1989年第4期297-309,共13页
Acta Geologica Sinica
基金
中国地质科学院<中国震旦系建系建系研究>项目中部分成果
