| 新疆阿克苏地区早寒武世碳酸盐岩沉积环境:微量元素和碳同位素证据 |
| |
| 引用本文： | 姚春彦,马东升,丁海峰,张晓勇.新疆阿克苏地区早寒武世碳酸盐岩沉积环境:微量元素和碳同位素证据[J].地球化学,2011,40(1):63-71. |
| |
| 作者姓名： | 姚春彦 马东升 丁海峰 张晓勇 |
| |
| 作者单位： | 南京大学内生金属矿床成矿机制研究国家重点实验室;南京大学地球科学与工程学院;江苏省环境监测中心; |
| |
| 基金项目： | 国家重点基础研究发展计划项目(2007CB411301) |
| |
| 摘 要： | 对出露于塔里木盆地北缘阿克苏地区寒武系纽芬兰统玉尔吐斯组上部和寒武系第二统肖尔布拉克组下部海相沉积碳酸盐岩进行了氧化-还原敏感元素(Mo、V、Cd和U)及稳定C、O同位素的地球化学剖面研究,以探讨早寒武世沉积碳酸盐岩的沉积环境.研究揭示,尤尔美那克剖面肖尔布拉克组底部和下部含有两个δ13C负异常,谷值分别为-2.1‰和...
|
| 关 键 词： | 早寒武世 碳同位素 微量元素 沉积环境 新疆 |
Reconstruction of the Early Cambrian carbonate sedimentary environment in Akesu area of Xinjiang, China: Evidences from trace elements and carbon isotope excursion |
| |
| YAO Chun-yan,MA Dong-sheng,DING Hai-feng,ZHANG Xiao-yong.Reconstruction of the Early Cambrian carbonate sedimentary environment in Akesu area of Xinjiang, China: Evidences from trace elements and carbon isotope excursion[J].Geochimica,2011,40(1):63-71. |
| |
| Authors: | YAO Chun-yan MA Dong-sheng DING Hai-feng ZHANG Xiao-yong |
| |
| Institution: | YAO Chun-yan1,MA Dong-sheng1,DING Hai-feng1 and ZHANG Xiao-yong2 1.State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210093,China,2.Jiangsu Environment Monitoring Center,Nanjing 210036 |
| |
| Abstract: | The concentrations of redox-sensitive elements Mo, V, Cd, U, and carbon and oxygen isotope data of marine carbonates from the Cambrian Terreneuvian, the upper Yuertusi Formation and the Cambrian Series 2 the lower Xiaoerbulake Formation in the Akesu area, northern of Tarim Basin （China） were investigated to understand bottom water redox conditions during the Early Cambrian. Two negative shifts of δ^13C appear in the Xiaoerbulake FormationoftheYouermeinakesectionwithvalleyvaluesof 2.1‰and 2.4‰sespectively, associated with the enrichment of redox-sensitive elements Mo, V, Cd, and U. Through these analyses, we demonstrate that the δ^13C negative shifts might indicate that the bio-productivity was decreasing due to the upwelling water. In the samples YR-3, YR-4, and YR-5, the contents of redox-sensitive elements reveal negative shift, connecting to Mn enrichment, which reflect the changes of the sedimentary conditions and the oxic surroundings. The contents of redox-sensitive elements Mo, V, Cd, and U are dramatically richer than average element contents from the sedimentary carbonates of the Earth Crust, with high V/Cr and V/Sc ratios in the samples YR-9, YR-10, YR-11, YR-12, and YR-13, and indicate an anoxic deposition environment. On the top of the Youermeinake section, lower concentrations of redox-sensitive elements, especially low V/Sc ratios, might imply near-oxic/suboxic conditions in the water columa. A large amount of fossils were found in the Yuertusi Formation and Xiaoerbulake Formation. Those imply that the ocean was stratified during the Early Cambrian, which was oxic on the surface and suboxic-oxic with transitory anoxic event in the bottom water. The upwelling water might have resulted in changes in the sedimentary conditions. |
| |
| Keywords: | the Early Cambrian carbon isotope trace element sedimentary environment Xinjiang |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
