沉积有机质中ββ藿烷成因研究—碳稳定同位素证据  

STUDY ON THE ORIGIN OF ββ HOPENES FROM DIFFERENT DEPOSITIONAL ENVIRONMENT-STABLE CARBON ISOTOPIC EVIDENCES

作　　者：周友平[1,2] 史继扬[3] 屈定创[3] 

机构地区：[1]华南农业大学理学院 [2]中科院广州地化所广州510000 [3]中科院广州地化所

出　　处：《华南师范大学学报（自然科学版）》1999年第3期53-58,共6页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金!(49472112)资助

摘　　要：应用单烃碳稳定同位素分析（ＣＳＩＡ） 技术，研究南方泥炭等８ 个样品溶剂可抽提部分中的ββ藿烷化合物的成因联系－ 结果表明，ββ藿烷是细菌藿多醇特别是藿四醇在成岩作用极早期经细菌改造的产物－ 改造过程中，侧链的断裂会导致同位素分馏，通常会导致藿类环系相对富集１３Ｃ－Compound specific isotopic analysis (CSIA) in combination with conventional organic geochemical investigation of ββ hopenes from 8 immature samples (6 peat samples, 1 source rock sample and 1 shale sample) representing various kerogen types, depositional environments were conducted. The results showed that:(1) C 32 ββ hopenes are the bacterial reworking products of C 35 bacterial hopanepoyol especially bacteriohopanetetrol at very early stage of diagenesis; (2) bacterial reworking can cleave the C-C bond between the ring system and the side chain, yielding an isotopic fractionation of up to 0.599% and a 13 C enriched ring system.

关 键 词：单烃 碳稳定 同位素分析 ββ藿烷 成因 CSIA 

分 类 号：P597.1[天文地球—地球化学]