塔里木地台阿克苏-乌什地区晚埃迪卡拉纪-早寒武世碳同位素特征及古海洋环境的演化

The Ediacaran-Cambrian sedimentary successions excellently outcrop in the Akesu-Wushen area in the northern margin of the Tarim platform. Stable layered phosphorous deposit was well preserved in the lower Cambrian. In this study, we will select three to four sections in the Akesu-Wushen area to measure elemental and carbon isotopic compositions of the upper Ediacaran to lower Cambrian. The aim of this study to evaluate the palaeo-environment change based on variation of the elemental and carbon isotopic compositions. Moreover, we hope to have a comprehensive stratigraphic correlation between the Ediacaran-Cambrian strata in Aksu-Wushen area and in Yangtze Platform and other continents in aiming to discuss the hottly-debated reasons of the carbon isotopic anomaly on the Ediacaran-Cambrian transitional period.In combiantion with previous studies,precise successive carbon-isotopic curve from the Ediacaran to the Cambrian period in the Tarim area, will be established.

塔里木地台西北部阿克苏-乌什地区晚埃迪卡拉纪-早寒武世地层出露良好，并且其寒武系底部有稳定的含磷沉积。本项目将通过对研究区3-4个典型剖面进行元素地球化学和同位素地球化学特征的分析，探讨晚埃迪卡拉纪-早寒武世碳同位素特征及古海洋环境的演化，同时利用得到的碳同位素地层曲线与扬子地台以及世界其他国家同期剖面进行对比，以期寻找和探讨埃迪卡拉系-寒武系转换时期碳同位素异常的原因。结合前人的研究成果，完善塔里木地台埃迪卡拉系-寒武系连续的碳同位素地层曲线。

《塔里木地台阿克苏-乌什地区晚埃迪卡拉纪-早寒武世碳同位素特征及古海洋环境的演化》于2013年启动。通过3年的工作，完成了对新疆阿克苏地区晚埃迪卡拉纪-早寒武世出露较好的典型剖面的系统取样工作（如肖尔布拉克剖面、苏盖特布拉克剖面等）。在完成阿克苏地区晚埃迪卡拉纪-早寒武世典型剖面样品采集工作的基础上，工作区一度扩展至库鲁克塔格地区（西大山剖面）。通过对现有地质资料及测试数据的整理分析，对阿克苏地区早寒武世古海洋沉积环境及晚埃迪卡拉纪-早寒武世地层界线及地层对比等科学问题进行了细致的探索研究。