古地理学报2012，Vol.14Issue(2)：165-175,11.
江汉盆地江陵凹陷南缘古新统沙市组四段含盐岩系沉积特征及其沉积环境意义
Sedimentary characteristics and its environmental significance of salt-bearing strata of the Member 4 of Paleocene Shashi Formation in southern margin of Jiangling Depression, Jianghan Basin
摘要
Abstract
Based on drilling core and experimental analyses, the authors studied the sedimentary characteristics of salt-bearing strata of the Member 4 of Paleocene Shashi Formation in southern margin of Jiangling Depression of Jianghan Basin. The sedimentation of salt lake is characterized by multi-period, continuous and periodically alternating of fresh and salt water. Therefore, it has become the important research focus to study palaeoclimate and palaeoenvironment. The salt-bearing strata of the Member 4 of Shashi Formation in southern margin of Jiangling Depression is composed of non-sandstone, mainly peperite of evaporate mineral, carbonate mineral, terrigenous clay and fine detrital mineral. The layer thickness can be a few millimeter to a few dozen centimeters. The accumulated bed thickness is up to a few dozen centimeters to a few meters. Through comparison analysis of Fe, Mn, Al, Ca, Mg, Co, Ni, V, Cu content and Sr/Ba, Mg/Ca, V/(V+Ni), Ni/Co, Cu/Zn ratio, the sedimentary characteristics and sedimentary environment of salt-bearing strata are studied systematically. It shows that the lake environment in the Yanjian Member of Shashi Formation is perennial relative deep delamination salt lake, which can be classified as brackish-water lake, semi-salt-water lake, salt-water lake and brine lake. The lake depth becomes shallow from downward to upward. Primary glauberite, typically warm facies saline minerals, is widely developed in this formation. The Fe2O3/FeO ratio represents drought climate. This feature reveals that the Paleocene Shashi Formation in southern margin of Jiangling Depression of Jianghan Basin is characterized by a drought and warm palaeoclimate.关键词
江汉盆地/江陵凹陷/含盐岩系/沉积特征/沉积环境/盐湖/古气候Key words
Jianghan Basin/ Jiangling Depression/ salt-bearing strata/ sedimentary characteristics/ sedimentary environment/ brine lake/ palaeoclimate分类
天文与地球科学引用本文复制引用
王春连,刘成林,胡海兵,毛劲松,沈立建,赵海彤..江汉盆地江陵凹陷南缘古新统沙市组四段含盐岩系沉积特征及其沉积环境意义[J].古地理学报,2012,14(2):165-175,11.基金项目
钾盐资源调查评价项目(编号:1212010011808)和国家重点基础发展研究计划项目(国家“973”项目)(编号:2011CB403000)联合资助 （编号:1212010011808）
