渝东南下寒武统黑色岩系稀土元素地球化学特征与沉积环境

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

详细信息

REE geochemical signatures and sedimentary environments of the Lower Cambrian black rock series in southeastern Chongqing and its adjacent areas

Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, Sichuan, China

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。
- 渝东南 /
- 黑色岩系 /
- 稀土元素 /
- 沉积环境
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.
- southeastern Chongqing /
- black rock series /
- REE /
- sedimentary environment