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Volume 17 Issue 1
Mar 2006
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Article Contents
Xianyu Huang, Dan Jiao, Liqiang Lu, Junhua Huang, Shucheng Xie. Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary. Journal of Earth Science, 2006, 17(1): 49-54.
Citation: Xianyu Huang, Dan Jiao, Liqiang Lu, Junhua Huang, Shucheng Xie. Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary. Journal of Earth Science, 2006, 17(1): 49-54.

Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary

Funds:

the National Natural Science Foundation of China 40232025

the Program for New Century Excellent Talent in University of the Ministry of Education of China NCET-04-0729

More Information
  • Corresponding author: Xie Shucheng, xiecug@163.com
  • Received Date: 22 Aug 2005
  • Accepted Date: 15 Dec 2005
  • 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 (煤山), Zhejiang (浙江) 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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