摘要:
1980—1982年间,我们在研究滇东震旦系与寒武系之间界线时,曾将晚震旦世至早寒武世过渡地层渔户村组由下至上划分为旧城段、白岩哨段、小歪头山段、中谊村段及大海段,筇竹寺组分为八道湾段和玉案山段等岩石地层单元(罗惠麟等,1982)。经过近10年的实践,证明这一划分基本合理,并为云南省地矿局区调队及第一地质大队广泛采用。
Abstract:
This paper deals with the division and transverse correlation of the Sinian-Cambrian boundary strata between the phosphate-carbonate sedimentary facies region and phosphorus-bearing carbonate sedimentary region in eastern Yunnan on the basis of the subdivision, correlation and facies analysis of three representative stratigraphic sections at the Sinian—Cambrian boundary,i.e. Dahai section in Huize County, Ershao section in Luquan County and Sapushan section in Wuding County. From east to west, the phosphorite facies grades into the phosphorus-bearing carbonate rock facies in the Zhongyicun member, and in the Xiaowaitoushan member, the siliceous rock facies passes into the siliceous dolostone facies. The positions of facies changes are roughly controlled by N—S-trending Pudu River palaeofault.
下载:
