The Investigation between Sedimentary Facies of Middle Cambrian and the Characters of Volcanic Rock, in Wenshan, Yunnan Province

Abstract:

The Middle Cambrian Tianpeng Formation volcanic rock, which was found in Baishiyan area in Wenshan recently, is the typical basalt. Through the research of Tianpeng Formation Sedimentary Enviroment and analysis of the geochemistry which includes the major elements, REE and Trace Element in the volcanic rock, SiO2 is 45.78-54.88%, total alkali (alk)=1.22-4.97 and K2O/Na2O=0.03-0.53, we can say that it should be tholeiite series. ∑REE=48.60-157.11ppm,LREE/HREE7.56-9.48,δEu0.40-1.05.REE distribution patterns show oblique to the HREE side and enrichment in LREE , the Eu anomaly is not obvious. We can see from the Trace Element Correlogram that the volcanic in this area is formed from the intiaplate basalt environment. The Tianpeng Formation in this area is clastic rock in a shallow sea and a basin facies and also is the deposit of flysch-simiflyschoid of siliceous and carbonate rock. Also, it deposit with the some undercompensation basin like laminated striation structure. All of those reflect that the structure background of the Middle Cambrian in Wenshan area has strong tensive back-arc spreading.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 2560-2565
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.2560
• Online since: January 2013
• Authors: Jian Guo Huang, Run Sheng Han, Tao Ren, Zhi Qiang Li
• Keywords: Features of Volcanic Rock, Sedimentary Facies, Tianpeng Formation, Wenshan, Yunnan

References

[1] Bureau of Geology and Mineral Resources of Yunnan Pronince. Beijing Geological Publishing House (in Chinese). ( 1990), pp.144-147

[2] R.S. Han C.Q. Liu Z.L. Huang et al.ore geology reviews, Vol.31(2007), pp.360-383

[3] Zhang Hong-pei,Liu Ji-shun,Li Xiao-bo,Zhang Xia-lin. Contributions to Geology and Mineral Resources Research,Vol. 21(2006): pp.87-90

[4] Li Chang-nian.Wuhan: China University of Geoscience Press,( 1989)

[5] Li Feng,Fan Zhu-guo, Li Bao-zhu.. Geotectonica et Metallogenia,Vol.27(2003): pp.48-55

[6] J.G. Huang, R.S. Han and B. Li , GEOCHIMICA ET COSMOCHIMICA ACTA, (2009), pp.558-558

[7] Irvine T.N. and Baragar W.R.A. Canad.Earth sci.,Vol.8(1971): pp.523-548

[8] Pearce J.A.and Norry M. J., Contrib.Mineral.Petrol, Vol.69(1979): pp.33-47