| 摘要: |
| 渝东南及周边地区下寒武统黑色岩系稀土总量略低于北美页岩,ΣLREE/ΣHREE值为1.99~9.01,平均6.86,轻稀土相对富集;δEu值为0.69~7.33,平均2.79;δCe值为0.70~1.01,平均0.85。区内下寒武统黑色岩系为正常海水与热水沉积作用的混合产物,形成于缺氧还原环境逐渐向弱氧化环境过渡的外陆架。 |
| 关键词: 渝东南 黑色岩系 稀土元素 沉积环境 |
| DOI： |
| 附件 |
| 投稿时间：2010-07-04修订日期：2010-08-09 |
| 基金项目:中国地质调查局《雪峰山西侧地区海相油气地质调查》项目资［2007］035-05资助 |
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| REE geochemical signatures and sedimentary environments of the Lower Cambrian black rock series in southeastern Chongqing and its adjacent areas |
| ZHAN Zhan, XIE Yuan, LIU Jian-qing, QIU Dong-zhou, YANG Ping |
| (Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, Sichuan, China) |
| Abstract: |
| The Lower Cambrian black rock series in southeastern Chongqing and its adjacent areas are characterized by less-enriched ΣREE,ΣLREE/ΣHREE ratios ranging between 1.99 and 9.01 with an average of 6.86, relatively Enriched LREE, δEu values ranging between 0.69 and 7.33 with an average of 2.79, and δCe values ranging between 0.70 and 1.01 with an average of 0.85. The results of research in the present paper show that the Lower Cambrian black rock series in the study area resulted from the mixing of the normal seawater and hot seawater deposition in the transitional conditions from the anoxic reducing environments to the weakly oxidized environments on the outer continental shelves. |
| Key words: southeastern Chongqing black rock series REE sedimentary environment |
