长链烯酮单体碳-14同位素分析技术进展与研究意义  

Alkenones-specific Radiocarbon Analysis:A Review of Approaches and Implications

作　　者：肖睿 包锐 邢磊[1,2] XIAO Rui;BAO Rui;XING Lei(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,and Frontiers Science Center for Deep Ocean Multispheres and Earth System,Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,China;Marine Ecology and Environmental Science Laboratory,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266071,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China)

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室与深海圈层与地球系统前沿科学中心,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266071 [3]南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《地球科学进展》2021年第12期1258-1271,共14页Advances in Earth Science

基　　金：国家自然科学基金项目“基于单体分子化合物碳-14技术的边缘海有机碳转化、迁移与埋藏过程研究”(编号:42076037);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项“粤港澳大湾区海岸线及滩涂湿地千年至十年尺度环境演变”(编号:GML2019ZD0209)资助。

摘　　要：生物标志物是研究古环境重建和物质循环理论的重要载体。针对海洋生物标志物的同位素研究是研究古海洋学与海洋元素循环理论的重要手段,应用国际先进的单体分子天然放射性碳同位素(碳-14)技术开展海洋环境演变和碳循环相关研究有着重要的科学意义。其中,长链烯酮单体分子碳-14年龄分析能够反映海洋搬运作用对有机质沉积过程的影响,对生物标志物重建古环境等应用提出了新认识,并为建立利用有机质进行沉积物定年的方法奠定基础,也为建立海洋环境变迁和海洋碳循环模型提供进一步的年龄约束。因此,有必要对长链烯酮单体分子碳-14年龄的测定与研究意义进行系统归纳总结。在此基础上,综合介绍了2种关键的长链烯酮单体的分离提纯技术、1种重要的烯酮单体分离技术和长链烯酮单体分子碳-14分析及计算方法,以及长链烯酮单体分离提纯的过程空白评估方法;并总结了长链烯酮单体分子碳-14分析技术在海洋学中的指示意义:①间接地指示海洋搬运作用;②示踪海洋碳库;③具有改进沉积物年代学和古环境指标的潜力。最后,提出了应用长链烯酮单体分子碳-14解决海洋碳循环的几点核心科学问题。系统地总结长链烯酮单体分子碳-14技术特点与典型范例,对未来在中国近海开展相关研究具有重要启示意义。Biomarkers are important organic geochemical fingerprints in studying paleoceanography and oceanic elemental cycles.Isotope compositions of biomarkers have significant meanings in investigating the paleoenvironmental reconstruction and carbon cycles in marine realm.Radiocarbon age of Long-Chain Alkenones(LCAs)has greatly scientific significance in constraining age models for establishing marine environmental changes,and studying oceanic carbon cycles at a molecular level,setting an important dimension for the future researches in compound-specific radiocarbon analysis.It thus is necessary to summarize systematically the approaches and implications of Alkenones-Specific Radiocarbon Analysis(ASRA).The separation and purification technologies of LCAs,radiocarbon calculation methods,and blank correction are summarized here.The significant implications of ASRA are proposed as follows:ASRA①indicates indirectly transportation and deposition processes on sedimentary organic matter,②can be used to trace marine carbon pool,and③to improve chronology and paleoenvironmental indicators in the ocean.The foreground of the development and application of ASRA are also demonstrated.We suggest that systematically summarizing the technical characteristics and typical applications of ASRA is of significance in carbon cycles and paleoenvironment reconstruction in marine system,especially for marine biogeochemical studies in China marginal seas.

关 键 词：长链烯酮 单体放射性碳同位素分析技术 放射性碳同位素 碳-14 生物标志物 

分 类 号：P597[天文地球—地球化学]