Biomarkers From the Xiayangao Member of the Early Ordovician Tonggao Formation in the Sandu Area, Guizhou Province
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摘要: 本文着重报道了贵州三都早奥陶世同高组下燕高页岩段生物标志化合物特征,首次在采自该层位的样品中检出丰富的正烷烃、链状类异戊二烯烷烃、萜类化合物及甾类化合物。测试结果显示:正烷烃图谱呈双驼峰形,碳数分布为nC15~nC35,以nC18为主峰碳,nC29为次主峰碳,C-21/C+22为0.77~1.02,OEP为0.94~1.04;植烷占优势,Pr/Ph为0.40~0.46;藿烷碳数为C27~C35,以C30占优势,C27+C29<C+31;仅见碳数分布为C20~C29的长链三环二萜烷,以C28为主峰碳;甾烷丰度顺序为C29甾烷>C27甾烷>C28甾烷,同时检出了孕甾烷和4-甲基甾烷。生物标志化合物显示出还原环境特点,且可能主要来自藻类。Abstract: Abundant biomarkers( including n-alkanes, acyclic isoprenoid, steranes and terpanes etc. ) have beendetected by GC-MS from the Xiayangao Member of the Early Ordovician Tonggao Formation in the San-du area of the Guizhou Provine. The carbon numbers of n-alkanes range from nC 15 to nC 35 , nC 18 as thehighest peak and nC 29 as the second, nC+ /nC+22 ratios are up to 0. 77 ~ 1. 02, and OEP= 0. 94 ~ 1. 04. Phy-tane is predominant over priatane with a Pr /Ph of 0. 40 ~ 0. 46( average 0. 44) . Hopane series consistmainly of C 27 ~ C 35 -hopanes, a-mong which C 30 -hopane is the most abundant one, and hopane C 27 + C 29 +31 . Tricyclic terpanes are only composed of long-chain ones their carbon numbers ranging from C 20 toC 29 , and strong predominance of C 23 is detected, Steranes consist mainly of C 27 -sterane, C 23 sterane and C29sterane. According to abundance, C 29 -sterane> C27 -sterane> C 28 -sterane, pregnance and 4-methy1 ster-anes are also identified. The composition and distribution of n-alkanes, acyclic isopenoid, terpanes andsteranes, combining with the biota occurring in the same rock samples, seem to show the characteristicsof a reduction environment, and the biomarkers detected from the rock samples might mainly originatefrom algae.
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