Xu Wanhong, Zhang Zhongying, Sheng ping, Meng Qianxiang. Biomarkers From the Xiayangao Member of the Early Ordovician Tonggao Formation in the Sandu Area, Guizhou Province[J]. Acta Sedimentologica Sinica, 1997, 15(3): 72-77.
| Citation:
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Xu Wanhong, Zhang Zhongying, Sheng ping, Meng Qianxiang. Biomarkers From the Xiayangao Member of the Early Ordovician Tonggao Formation in the Sandu Area, Guizhou Province[J]. Acta Sedimentologica Sinica, 1997, 15(3): 72-77.
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Biomarkers From the Xiayangao Member of the Early Ordovician Tonggao Formation in the Sandu Area, Guizhou Province
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1 Department of Earth Sciences,Nanjing University,Nanjing 210093;
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2 Lanzhou Institute of Geology,Academia Sinica,Lanzhou 730000
- Received Date: 1995-09-25
- Publish Date:
1997-09-10
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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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