古地理学报2018，Vol.20Issue(2)：191-206,16.DOI:10.7605/gdlxb.2018.03.014
河南宜阳下三叠统刘家沟组微生物成因沉积构造演化及其对古环境变化的响应
Evolution of Microbially Induced Sedimentary Structures and their response to palaeoenvironment variation of the Lower Triassic Liujiagou Formation in Yiyang area, Henan Province
摘要
Abstract
There are dozens of Microbially Induced Sedimentary Structures (MISS) in the red sandstone of Lower Triassic Liujiagou Formation in Yiyang area,Henan Province,including wrinkle structures,desiccation cracks and mat chips.According to the morphology evolution of MISS,it is divided into 4 different fabrics,namely wrinkle structures fabric,petees fabric,mini desiccation cracks fabric and large desiccation cracks fabric from bottom to top.They reflect the nuance palaeoenvironment and palaeoclimate:(1)wrinkle structures fabric reflects the warm moist suboxic sedimentary environment;(2) petees fabric reflects the warm moist oxygen-enriched sedimentary environment;(3)mini desiccation cracks fabric reflects the warm semi-arid suboxic sedimentary environment;(4) large desiccation cracks fabric reflects the hot semi-arid oxygen-enriched sedimentary environment.The geochemical information also indicates that the palaeoenvironment in the Early Triassic in Yiyang area changed from warm and moist suboxic to hot and semi-arid oxygen-enriched.In conclusion,the development and evolution of MISS in Yiyang area were a response to subtle changes of continental palaeoenvironment in the Early Triassic.关键词
微生物成因沉积构造/脱水裂痕/皱饰构造/古气候/下三叠统/河南宜阳Key words
Microbially Induced Sedimentary Structures/desiccation cracks/wrinkle structures/palaeoclimate/Lower Triassic/Yiyang area of Henan Province分类
天文与地球科学引用本文复制引用
邢智峰,周虎,林佳,王敏,郑伟..河南宜阳下三叠统刘家沟组微生物成因沉积构造演化及其对古环境变化的响应[J].古地理学报,2018,20(2):191-206,16.基金项目
国家自然科学基金项目(编号:41102008,41202071,40202011)和河南理工大学博士基金项目(编号:B2012-083)联合资助.Co-funded by the National Natural Science Foundation of China (Nos.41102008,41202071,40202011) and Doctoral Program of Henan Polytechnic University (No.B2012-083) （编号:41102008,41202071,40202011）
