Advances in Earth Science
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Fan Pu,Zhang Baisheng,Yu Xinke
Fan Pu,Zhang Baisheng,Yu Xinke. BIOMARKERS FROM RECENT SALT-LAKE SEDIMENTS[J]. Advances in Earth Science, 1994, 9(3): 6-17.
Organic matter and biomarkers from many recent salt-lake sediments in West China Have been investigated in the present paper by gas chromatography(GC), gas chromatography-mass spectrometry(GC/MS) multiple ion detection, Pyrolysis and isotope mass spectrometry. Particular emphasis has been placed on the geochemical characteristics of the saline sedimentary environment,the nature of organie matter and the early diagenesis on the basis of the general geochemistry characteristics of organic matter and compositions, distributions and molecular Parameters of various biomarkers. The results show that the carbon isotope composition(δ13C) in kerogen seems to have a certain relation ship with the salt-type of salt lakes; pristane/phytane(Pr/Ph) ratio, ∑tricyclic terpanes/∑terpanes(%), ∑pregnanes/∑steranes(%), gammacerane/αβ-hopane and the relative percentage of three fluorine series eompounds could be regarded as good indicators recognizing sedimentary environments of different salinities; the distribution of n-alkanes, the relative concentration of C27, C28 and C29 steranes and the occurrence of some typical biomarkers such as tricyclic diterpane can be used to determine the nature of organic matter. Additionally, we report here on m/z 217, m/z 231, m/z 245 and m/z 259 tri-aromatic steranes found in recent sediments from each salt lake and infer their possible origin.