| Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary |
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| 作者姓名： | 黄咸雨 焦丹 鲁力强 黄俊华 谢树成 |
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| 作者单位： | State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan430074 China，State Key Laboratory of Geological Processes and Mineral Resources，China University of Geosciences Wuhan430074 China，Facultyof Material Science and Chemical Engineering，China University of Geosciences Wuhan430074 China，State Key Laboratory of Geological Processes and Mineral Resources，China University of Geosciences Wuhan430074 China，State Key Laboratory of Geological Processes and Mineral Resources The Key Laboratory of Biogeology and Environmental Geology ofthe Ministry of Education China University of Geosciences Wuhan430074 China |
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| 基金项目： | This paper is supported by the National Natural Science Foundation ofChina (No.40232025)，the Programfor New Century Excellent Talentin University of the Ministry of Education of China (NCET-04-0729) . |
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| 摘 要： | INTRODUCTIONThe Permian-Triassic ( Tr/P) boundary , datedto be (251 .4±0 .3) Ma ago ,is marked by the mostdrastic mass extinction of organisms in the Phanero-zoic .In order to explore the pattern and the cause ofthe mass extinction,extensive research has been fo-cused on biostratigraphy , isotopic chronostratigra-phy , event stratigraphy , ecostratigraphy and se-quence stratigraphy (Payne et al .,2004 ; Reichowetal .,2002 ; Yin et al .,2001 ;Jin et al .,2000 ;Zhanget al .,1996 ,1995 ;…
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| 关 键 词： | 梅山 芳烃 化石 二叠纪 三叠纪 |
| 收稿时间： | 2005-08-22 |
| 修稿时间： | 2005-12-15 |
Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary |
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| Huang Xianyu,Jiao Dan,Lu Liqiang,Huang Junhua,Xie Shucheng.Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary[J].Journal of China University of Geosciences,2006,17(1):49-54. |
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| Authors: | Huang Xianyu Jiao Dan Lu Liqiang Huang Junhua Xie Shucheng |
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| Institution: | 1. Institute of Rock Structure and Mechanics, AS CR, v.v.i., V Hole?ovi?kách 41, 182 09 Prague, Czech Republic;2. Czech Geological Survey, Klárov 3, 118 21 Prague, Czech Republic;3. University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech Republic |
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| Abstract: | Aromatic compounds extracted from sedimentary rocks can reflect environmental conditions, organic sources and maturity. The aromatics, identified in association with mass extinction in particular, would provide a signature assisting our understanding of the causes of the biotic crisis. Aromatic hydrocarbons were fractionated from the total lipid extracts of 37 samples taken from the Permian-Triassic boundary (beds 23 to 34) of section B at Meishan , Zhejiang Province in South China. These aromatics were analyzed by using gas chromatography-mass spectrometry (GC-MS). Main compounds identified include naphthalene, phenanthrenes, fluorene, dibenzothiophene, dibenzofuran, fluoranthene, pyrene and some of their methyl homologues. The indices of methyl phenanthrene distribution fraction indicate the comparable maturity (within the oil window, 0.7%-1.0% of the mean vitrinite reflectance) of the organic matter throughout the whole profile analyzed. The ratio of dibenzothiophene to phenanthrene (DBT/PHN) varies generally at a comparable pace with lithology. Significantly, a gradual decrease of this ratio was observed within bed 24 limestone, which is probably due to the variation of sedimentary environment. This change is in line with the drop in the carbon isotope composition of carbonate, the loss of the Changhsingian reef ecosystem, and the decrease of cyanobacteria abundance within the bacteria population. The coincidence of these records suggests a close relation between the biotic crisis and marine environmental conditions, and these records clearly show the onset of the biotic crisis prior to event bed 25. |
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| Keywords: | Meishan Permian-Triassic boundary aromatic hydrocarbons molecular fossil dibenzothiophene fluorene series paleoenvironment |
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