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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 3    March 2016

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Geochemistry of lower Silurian shale of Longmaxi Formation, southeastern Sichuan Basin, China: implications for provenance and source weathering
GUO Ling(郭岭)1,2, JIA Chao-chao(贾超超)2, DU Wei(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

Abstract: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.

 

Key words: trace elements; black shale; provenance; weathering; discriminant diagrams; Sichuan Basin

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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