GDGT_review_地学前缘.doc

四醚键膜类脂生物地球化学研究进展 黄咸雨，杨欢，Chuanlun L. Zhang，谢树成 中国地质大学（武汉）生物地质与环境地质教育部重点实验，武汉 430074Department of Marine Sciences, The University of Georgia, Athens, GA 30602, USA HUANG Xian-yu1, YANG Huan1, Chuanlun L. Zhang2, XIE Shu-cheng1 Key Laboratory of Biogeology and Environmental Geology, Ministry of Education, China University of Geosciences, Wuhan 430074, China Department of Marine Sciences, The University of Georgia, Athens, GA 30602, USA Huang Xianyu-yu, Yang Huan, Chuanlun L. Zhang, et al. Advances in biogeochemistry of tetraether membrane lipids Abstract: Archaea can synthesize glycerol dialkyl glycerol tetraethers (i.e. iGDGTs) with isoprenoid alkyl chains as major membrane lipids, whilst some unknown bacteria can produce branched GDGTs(i.e. bGDGTs). Previous studies show that Archaeal GDGTs widely distribute in various (hyper)thermal (e.g. terrestrial hot springs and submarine hydrothermal vents) and low temperature environments (e.g. marine and lacustrine sediments, peats and soils), whereas high abundance of bacterial bGDGTs mainly occur in terrestrial peatlands and soils. Based on the wide investigation of archaeal lipids in modern environments, the distribution of iGDGT and other archaeal biomarkers (e.g. crocetane and sn-2-hydroxyarcheaol), could be used to act as indicators not only for past global carbon and nitrogen cycles, but also for the co-evolution of archaea and environment in geological history. Moreover, several tetraether indices, including paleotemperature proxy TEX86, branched and isoprenoid tetraether index (BIT), methylation index (MBT) and cyclization ratio (CBT) of branched tetraethers, have been established recently and then rapidly applied to paleoenvironmental reconstruction. Domestic reports about GDGT distributions and applications are quite rare at present . Key words: ether-bonded membrane lipid; isoprenoid GDGT; branched GDGT; biogeochemistry 摘要glycerol dialkyl glycerol tetraether，缩写为GDGT）的烷基支链具有类异戊二烯特征，而细菌四醚键膜类脂的烷基支链不具有类异戊二烯结构特征。古菌GDGT