贵阳花溪地区早三叠世碳、氧同位素特征及其古环境意义  

Carbon and oxygen isotopic stratigraphy and its palaeoenvironmental significance in Huaxi region of Guiyang during the Early Triassic

作　　者：尚晓冬[1,2] 时国[3] 韦恒叶[3] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国科学院大学地球科学学院,北京100049 [3]东华理工大学地球科学学院,南昌330013

出　　处：《中国科学院大学学报（中英文）》2015年第3期363-372,共10页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(41002007);东华理工大学博士科研启动基金(DHBK1001)资助

摘　　要：对取自贵阳花溪地区改毛剖面上二叠统—下三叠统碳酸盐岩样品进行碳、氧同位素测定,利用所测数据建立相应的演化曲线.根据曲线变化情况,结合地质背景与岩性,着重探讨碳同位素变化的环境原因,并对研究区该时期古环境进行分析解释.研究表明,早三叠世初期,该地区海洋生态环境遭到严重破坏,但在Griesbachian早期有一次短暂恢复,而后又进入长期低迷的缺氧环境直到Smithian中期.Carbon and oxygen isotopic determination of carbonate samples has been carried out in this work, and the samples were collected from the Upper Permian-Lower Triassic of Gaimao section in Huaxi region of Guiyang. The measured data were used to plot the corresponding evolution curves. Based on the geological settings and lithology, the environmental causes of carbon isotopic variation were discussed and the analysis of palaeoenvironment at that time in the study area was performed according to changes in the curve. The results show that the marine ecological environment in this area was extremely damaged in the earliest Triassic. However, a transient recovery occurred in the early Griesbachian. After that, the ecological environment stepped into a long-term anoxic downturn until the middle Smithian.

关 键 词：早三叠世 碳、氧同位素 古环境 贵阳花溪 

分 类 号：P534.51[天文地球—古生物学与地层学]