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Single Molecule Carbon Isotope of n-Alkane from Sediments and Its Application to Environments,Western Sichuan

WANG Yubin~1) GUAN Ping~1) LIU Wenhui~2)( ~1)School of Earth and Space Sciences, Peking University,Beijing,100871; ~2)Exploration and Production Research Institute, SINOPEC,Beijing,100083)  
The data of n-alkane of lacustrine sediments in west of Sichuan prove the connection between the value of δ( ~13C) of C17-C22 n-alkane and the altitudes. The δ( ~13C) values of C17-C22 n-alkane increase along with the elevated altitude. According to the δ( ~13C) data, The relationship results from three key associated factors: partial pressure mospheric carbon dioxide p(CO\-2), temperature and precipitation. The results also support the opinion that the δ( ~13C) value of C26-C33 n-alkane decrease along with the elevated altitude. Thus, comparing two aspects (n-alkane of longer and shorter train) mentioned above, it could be better to estimate the change of the altitude and the environment during the past time.
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