黔北务川-正安-道真地区铝土矿系中生物标志物及其地质意义<sup>*</sup>

doi:10.7605/gdlxb.2012.05.010

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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.

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	Articles by authors
	Yu Wenchao
	Du Yuansheng
	Zhou Qi
	Jin Zhongguo
	Wang Xiaomei
	Qin Yongjun

Key words： bauxite-bearing strata biomarker palaeoecosystem Wuchuan-Zheng′an-Daozhen area Guizhou Province

Received: 14 March 2012 Published: 01 October 2012

ZTFLH:

P593

About author: Yu Wenchao，born in 1988，is a Ph.D.candidate of China University of Geosciences（Wuhan）and is mainly engaged in research of sedimentology. E-mail:evilchaos@sina.com.
About the corresponding author Du Yuansheng，born in 1958，is a professor and Ph.D.supervisor of China University of Geosciences（Wuhan）and is mainly engaged in the researches of sedimentology and geology of orogenic belt. E-mail:duyuansheng126@126.com.

Cite this article:

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]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(5): 651-662.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2012.05.010 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2012/V14/I5/651

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