Geochemical Characteristics and Genesis Discussion of&nbsp; Wujiaping Formation Siliceous Rocks in Xuanhan Area of Sichuan Basin

LI  Feng-Jie, LIU  Dian-He, LIU  Qi

doi:10.11764/j.issn.1672-1926.2010.01.62

2010 , Vol. 21 >Issue 1: 62 - 67

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.01.62

Geochemical Characteristics and Genesis Discussion of Wujiaping Formation Siliceous Rocks in Xuanhan Area of Sichuan Basin

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Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059，China

Received date: 2009-06-11

Revised date: 2009-08-18

Online published: 2010-02-10

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Abstract

The different types of siliceous rocks(i.e.flaggy siliceous,striped siliceous and striped chert noddle) occurr in the Wujiaping Formation,Xuanhan area of Sichuan basin.The rare earth elements and trace elements in different siliceous rocks from Yanggudong section in Dukou town,Xuanhan County,were measured.The total volume of rare earth elements is relatively low,and shows the increasing tendency from striped chert noddle to striped siliceous rocks and flaggy siliceous rocks in turns.The shale-normalized rare earth elements have slight to intermediate negative δCe anomalies,intermediate ratios of La_n/Ce_n,La_n/Yb_nand an overwhelming majority negative δEu anomalies,suggesting the continental margin and open-ocean basin environment for siliceous rocks.Trace elements of Co,Ni,As and Sb elements indicate that siliceous rocks would be formed under non-hydrothermal deposition.Integrating the outcrop geochemical characteristics in NE Sichuan Basin,these suggest the sedimentary environment of Wujiaping Formation siliceous rocks mainly continental margin and open-ocean basin,and part of striped siliceous rocks influenced by weak hydrothermal fluids.

Key words： Rare earth elements; Trace elements; Siliceous rock genesis; Wujiaping Formation; Sichuan basin.

Cite this article

LI Feng-Jie, LIU Dian-He, LIU Qi . Geochemical Characteristics and Genesis Discussion of Wujiaping Formation Siliceous Rocks in Xuanhan Area of Sichuan Basin[J]. Natural Gas Geoscience, 2010 , 21(1) : 62 -67 . DOI: 10.11764/j.issn.1672-1926.2010.01.62

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