Geochemistry of lower Silurian shale of Longmaxi Formation, southeastern Sichuan Basin, China: Implications for provenance and source weathering
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- 作者：Ling Guo 郭岭 ; Chao-chao Jia 贾超贿/a> ; Wei Du 杜伟
- 关键词：trace elements ; black shale ; provenance ; weathering ; discriminant diagrams ; Sichuan Basin
- 刊名：Journal of Central South University
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：23
- 期：3
- 页码：669-676
- 全文大小：2,877 KB
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Chao-chao Jia 贾超超 (2)
Wei Du 杜伟 (3)
1. State Key Laboratory of Continental Dynamics, Northwest University, Xi’an, 710069, China
2. Department of Geology, Northwest University, Xi’an, 710069, China
3. Research Institute of Petroleum Exploration and Development of Sinopec, Beijing, 100083, China - 刊物类别：Engineering
- 刊物主题：Engineering, general
Metallic Materials
Chinese Library of Science - 出版者：Central South University, co-published with Springer
- ISSN：2227-5223
文摘
Lower Silurian Longmaxi Shale (SLS) in southeastern Sichuan Basin, China, was analyzed for major and selected trace elements, and their provenance, intensity of palaeoweathering of the source rocks were analyzed based on these elements. The results show that SiO2, Al2O3 and Fe2O3, are dominant major elements with average contents of 60.59%, 15.91% and 5.87% in Upper Silurian Longmaxi Shale (USLS), and 65.14%, 13.24% and 4.68% in Lower Silurian Longmaxi Shale (LSLS). The TiO2−Zr plot, Hf (ppm) versus La/Th discriminant diagram, and abundance of Cr and Ni suggest a dominantly felsic source for the Longmaxi sediments. Average chemical index of alteration (CIA), plagioclase index of alteration (PIA) values (64.05% and 72.86%, respectively) imply low-degree chemical weathering of the source material in early Longmaxi time, and average CIA, PIA values (68.44% and 80.35%, respectively) imply moderate chemical weathering of the source material in late Longmaxi time.