Intact Polar and Core Tetraether Lipids in Sediments from the Haiyang 4 Cold-seep of the Northern South China Sea and their Implications  

作　　者：LI Yuejiao SU Xin JIAO Lu CHEN Fang CHENG Sihai 

机构地区：[1]School of Ocean Sciences,China University of Geosciences,Beijing 100083,China [2]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Beijing 100083,China [3]Guizhou University of Finance and Economics,Guiyang 550025,China [4]Guangzhou Marine Geological Survey,Guangzhou,510075,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第2期691-700,共10页地质学报（英文版）

基　　金：supported by the Natural Science Foundation of China(Grant Nos.40672005 and 41776066)。

摘　　要：A number of cold seeps have been discovered in the northern South China Sea(SCS) including the Haiyang 4 cold-seep area where Core 973-5 was collected. Intact polar lipids(IPLs) and core lipids(CLs) were analyzed separately in sediments from Core 973-5. The most abundant lipid biomarkers were isoprenoidal GDGTs(iso GDGTs), with Crenarchaeol and GDGT-0 predominating. IPL-iso GDGTs and CL-iso GDGTs were mainly derived from Thaumarchaeota. IPL-iso GDGTs were mainly produced and retained in situ thus containing most of the in situ microbiological information. Branched GDGTs were predominantly derived from generated in marine production, and mixed with some terrestrial inputs. All IPLs groups presented a high value in the sulfate-methane transition zone(SMTZ). Furthermore, IPL and CL-MI, IPL-R;showed the highest values within the SMTZ, while IPL and CL-R;had the lowest values at the SMTZ, suggesting that the contribution of Methanophila and methanogenic to GDGTs increased, while the contribution of ammonia-oxidizing Archaea to GDGTs decreased at the SMTZ.

关 键 词：GDGTs IPLs SMTZ source Core 973-5 Haiyang 4 Cold-seep South China Sea 

分 类 号：P736.2[天文地球—海洋地质]