冀北坳陷承德地区洪水庄组中13α(正烷基)-三环萜烷的分布  

Distribution of 13α(n-alkyl)-tricyclic terpane in the Hongshuizhuang Formation in the Chengde area of Jibei Depression

作　　者：肖洪 李美俊[1] 刘卫彬 王方正 XIAO Hong;LI Meijun;LIU Weibin;WANG Fangzheng(State Key Laboratory of Petroleum Resources and Engineering,College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Oil and Gas Survey,China Geological Survey,Beijing 100029,China;No.3 Gas Production Plant,Changqing Oilfield Company,PetroChina,Xi’an 710018,Shaanxi,China)

机构地区：[1]中国石油大学(北京)地球科学学院,油气资源与工程全国重点实验室,北京102249 [2]中国地质调查局油气资源调查中心,北京100029 [3]中国石油长庆油田分公司第三采气厂,陕西西安710018

出　　处：《地球化学》2024年第6期827-834,共8页Geochimica

基　　金：国家自然科学基金项目(42202134)资助。

摘　　要：前寒武纪原生有机质中分子标志化合物的研究,有助于探讨地球早期生物群落组成和古沉积环境特征。本研究采用色谱-质谱和色谱-质谱-质谱分析技术,在华北承德地区中元古界洪水庄组(约1.45 Ga)黑色页岩样品中检测到13α(正烷基)-三环萜烷系列化合物。结果表明,研究区洪水庄组页岩中13α(正烷基)-三环萜烷系列化合物的碳数范围可延伸至C_(33),且未出现C_(22)、C_(27)、C_(32)同系物的缺失或低丰度特征,揭示13α(正烷基)-三环萜烷的C-13位取代基并非无环类异戊二烯烷基结构,而是直链的正烷基。根据13α(正烷基)-三环萜烷仅局限分布于燕山地区中元古代沉积物中,以及元古宙海洋的生物群落组成特征,提出13α(正烷基)-三环萜烷可能源自特定细菌或蓝细菌种属,且在显生宙已灭绝。The study of Precambrian molecular markers is of great significance for exploring the early earth’s biological community and the evolution of the paleo-ocean sedimentary environment.In this study,13α(n-alkyl)-tricyclic terpane series compounds were detected in black shale samples from the Hongshuizhuang Formation in the Chengde area using gas chromatography-mass spectrometry and gas chromatography-mass spectrometry-mass spectrometry analytical techniques.The results show that the carbon number range of 13α(n-alkyl)-tricyclic terpane series extends from C_(18)-C_(23) to C_(18)-C_(33).According to the relative abundance of C_(18)-C_(33) and the obvious distribution of C_(22),C_(27),and C_(32) homologs,it is further confirmed that 13α(n-alkyl)-tricyclic terpane series has a long-chain n-alkyl group at the C-13 position instead of an acyclic isoprenoid side chain.Based on the limited distribution of 13α(n-alkyl)-tricyclic terpane series in the Mesoproterozoic sediments of the Yanshan area and the primitive biological communities of the Proterozoic oceans,it is proposed that 13α(n-alkyl)-tricyclic terpanes originated from specific bacteria and/or cyanobacteria species and that they were extincted in the Phanerozoic.

关 键 词：13α(正烷基)-三环萜烷 洪水庄组 中元古界 承德地区 华北克拉通 

分 类 号：P618.13[天文地球—矿床学]