Biomarkers of bauxite-bearing strata and its geological significance in Wuchuan-Zheng′an-Daozhen area，northern Guizhou Province
Yu Wenchao1 Du Yuansheng1 Zhou Qi2 Jin Zhongguo3 Wang Xiaomei4 Qin Yongjun2
1 State Key Laboratory of Biogeology and Environmental Geology，China University of Geosciences（Wuhan），Wuhan 430074，Hubei 2 Bureau of Geology and Mineral Exploration and Development of Guizhou Province，Guiyang 550004，Guizhou 3 Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou，Guiyang 550005，Guizhou 4 Faculty of Earth Resource，China University of Geosciences（Wuhan），Wuhan 430074，Hubei
Abstract：The bauxite deposits between the Carboniferous Huanglong Formation and Permian Liangshan Formation in Wuchuan-Zheng′an-Daozhen area，northern Guizhou Province mostly belong to sedimentary bauxite.Abundant biomarkers including n-alkanes，isoprenoid，terpenoids and steroids in drilling core samples are detected by GC and GC-MS.The results of GC reveal that most of n-alkane in ten samples are composed of n-C14～n-C35 and characteristic of double-peak distribution.CPI ranges from 0.90 to 3.45，indicates obvious odd-even carbon number predominance.Pristane to phytane ratios（Pr/Ph）vary from 0.38 to 0.77.According to the results of GC-MS，the relative abundance from higher to lower is pentacyclic triterpanoids,tricyclic terpane,tetracyclic terpane，and C30 hopane is most abundant in the terpanes，meanwhile，small quantities of gammacerane are detected.Regular steroids distributed in “L” or “V” shape includes a small amount of 4-methyl sterane.Combined with petrographical characters of samples，the biomarker parameters indicate a reductive sedimentary environment which shows slant acidity，the organic matter in bauxite deposit originate from both terrestrial plant and bacteria/algae.It clearly shows double influences from terrestrial and aquatic palaeoecosystems during bauxite forming process.
Yu Wenchao,Du Yuansheng,Zhou Qi et al. Biomarkers of bauxite-bearing strata and its geological significance in Wuchuan-Zheng′an-Daozhen area，northern Guizhou Province[J]. JOPC, 2012, 14(5): 651-662.
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