摘要
根据下扬子区，特别是南京周冲村石膏矿区深部发育的蒸发岩的沉积特征及其在纵向上的变化，将这套蒸发岩地层自下而上分为下、中、上三段。它们所反映的沉积环境分别为：下段，潮坪—泻湖；中段，咸化泻湖；上段，主要为萨布哈环境。另外，根据这套蒸发盐建造（含地表次生产物—膏（盐）溶角砾岩和次生石灰岩）的分布范围及其岩性、岩相等特征，笔者认为：在西起安徽怀宁。东至江苏常州附近，东南以安徽南陵—江苏常州—线为界，西北以郯—庐断裂为界的范围内，主要发育着—套潮坪—蒸发泻湖碳酸盐—硫酸盐相的沉积物，代表了以潮坪—蒸发泻湖—萨布哈为主的沉积环境。
There is developed an evaporite formation of TriaSsic age in the Lower Yangtze River Re-gion- According to its rock assemblege, charaeteristics of organism, sedimentary structures,geochemistry and other faeies criteria, the evaporite formation can be divided into three mem-bers (from lower to upper) and my be caued as lower, middle and upper member, respective-ly- The sedimentary environments of these three members belong to tidal flat-sa1inized lagoonfor the lower mernber, salinized lagoon for the middle member and Sabkha for the upper mem-ber, respectively.Judging from distribution range and sedimentary characteristics of the evaporite formation(including its secondary limestone and solution breccia of gypsum outcropped on the surface),authors believed that the southeastern boundary of the evaporite formation is the line passingfrom Changzhou l Jiangsu Province to Nanling, Anhui Province, and the northwestern bound-ary is Tancheng-Lujiang FauIt- Within this range, a series of sediments of carbonates and sul-phates are deposited in the evaporated lagoons, representing sedimentary environments domi-nated by tidal flat-evaporated lagoon-Sabkha'
出处
《火山地质与矿产》
1997年第2期126-136,共11页
Volcanology & Mineral Resources
关键词
沉积环境
三叠系
盐矿床
炭酸盐
石膏矿床
Triassic evaporite formation sedimentary environments Lower Yangtze River region
