西南石油大学学报(自然科学版) ›› 1998, Vol. 20 ›› Issue (3): 26-30.DOI: 10.3863/j.issn.1000-2634.1998.03.008

• 石油地质勘探 • Previous Articles     Next Articles

Distribution and Geological Significance of REE in the Silurian of Southeast Sichuan

Zhang Ting-shan1 Chen Xiao-hui1 LanGuang-zhi1 Yu Jian-bua2 Bian Li-zeng2

  

  1. (Dept. of Petroleum Exploration,SWPI, Sichuan, 637001 )
  • Received:1997-12-02 Revised:1900-01-01 Online:1998-08-20 Published:1998-08-20
  • Contact: Zhang Ting-shan

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Abstract: Instrument neutron activation analyses ( IN-AA) were carried out on 48 Silurian samples from Guanyinqiao section in Southeast Sichuan, and 8
REEs were detected. Based on the analytic results, a detailed discussion is made on the distribution and occurrence pattern of REEs and the characteristics of Early- Silurian oceanic evolution and sedimentary
environments in the area. And the following conclu-sion is reached: (1) the Longmaxi Formation was deposited in a shallow euxinic basin; (2) from the
Longmaxi Formation to the Shiniulan Formation,∑REE decreases gradually and Ce shifts from negative to positive anomalies, indicating a trend of rise of the
sea level. The highest sea level was reached during deposition of the Shiniulan Formation. (3) the con-clusions drawn from REE analyses are consistent with those from sedimentological, tectonic and other
geochemical studies, indicating that REEs can be used as indicators of evolution of sedimentary envi-ronments.

Key words: REE, Distribution, Sedimentary environ-ment, Silurian, Sichuan Basin

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