第48卷 第1期
Vol.48, No.1, 79–87 2019年1月
GEOCHIMICA Jan., 2019
收稿日期(Received): 2018-01-16; 改回日期(Revised): 2018-03-10; 接受日期(Accepted): 2018-03-28
基金项目: 国家自然科学基金(41276072)
铁路运输安全保护条例作者简介: 王先绪(1992–), 男, 硕士研究生, 地球化学专业。E-mail: xianxuwang1992@sina
* 通讯作者(Corresponding author): JIA Guo-dong, E-mail: jiagd@gig.ac; Tel: +86-21-65982215
Geochimica ▌ Vol. 48 ▌ No. 1 ▌ pp. 79–87 ▌ Jan., 2019 东海和黄海沉积物中海洋自生来源 对支链四醚类化合物的贡献
王先绪1,3, 贾国东2*
(1. 中国科学院 广州地球化学研究所 边缘海地质重点实验室, 广东 广州 510640; 2. 同济大学 海洋地质国家重点实验室,
上海 200092; 3. 中国科学院大学, 北京 100049)
诠释生命
摘 要: 近些年, 支链甘油二烷基甘油四醚类脂物(brGDGTs)被广泛应用于陆地古气候、古环境重建研究
中, 并取得了一系列的进展。brGDGTs 在海洋沉积物中普遍存在, 起初被认为是陆源输入的结果, 但越来
越受到质疑。在中国东海和黄海区域, brGDGTs 的相关研究还相对较少。本文分析了位于南黄海和东海北
部的4个站位年龄跨度近百年的柱状岩芯, 讨论了brGDGTs 相关参数的特点, 在此基础上探讨了
马鬃蛇
brGDGTs 的来源。结果显示, 岩芯沉积物中brGDGTs 分布样式与已发表的黄河和长江流域土壤中全国政法队伍建设工作会议
brGDGTs 分布样式存在显著差别, 暗示了海洋微生物自生brGDGTs 的存在。在假设岩芯沉积物中
brGDGTs 主要由长江和黄河流域土壤输入和海洋微生物自生三端元贡献的情况下, 用四甲基brGDGTs 百
分含量(%tetra)和四甲基环化指数(#Ring tetra )参数计算了三个端元的相对贡献和绝对变化情况。结果表明海
洋自生是沉积物中brGDGTs 的主要贡献者, 在南黄海中北部可达70%以上。从百余年来的沉积序列来看,大学生职业测评系统
海洋自生brGDGTs 的含量有增加的趋势, 这种趋势可能与海水的富营养化增强有关, 也可能是随沉积深
度增加降解加强的结果。
关键词: 海洋沉积物; 支链GDGT; 来源; 海洋自生; 陆地土壤
中图分类号: P593 文献标识码: A 文章编号: 0379-1726(2019)01-0079-09
DOI: 10.19700/j.0379-1726.2019.01.007
Contribution of endogenous brGDGTs to marine sediments
走近女局长in the East China and Yellow seas
WANG Xian-xu 1,3 and JIA Guo-dong 2*
1. CAS Key Laboratory of Ocean and Marginal Sea Geology , Guangzhou Institute of Geochemistry , Guangzhou 510640, China ;
2. State Key Laboratory of Marine Geology , Tongji University , Shanghai 200092, China ;
3. University of Chinese Academy of Sciences , Beijing 100049, China
Abstract: Recently, brGDGTs were widely applied in terrestrial paleo-climatic and paleo-environmental reconstructions. brGDGTs are ubiquitous in marine sediments and are typically considered to be derived from soils, though this assumption is increasingly in doubt. In this work, we analyzed brGDGTs in four sediment cores from the East China and Yellow seas. These cores covered a history of approximately 100 years. BrGDGT compound distributions from these marine s
ediments are discussed to elucidate their sources. We found that the brGDGT distribution in the studied marine sediments greatly differed from that in the soils from the catchments of the Changjiang and the Yellow rivers, suggesting considerable endogenous production of brGDGTs. Given that brGDGTs in core sediments are derived from three end members, i.e. soils from the Changjiang and Yellow rivers, and in-situ marine production, the relative contributions of the three were calculated based on %tetra and #Ring tetra parameters. The calculated results show that marine in-situ production was the dominant source of the sedimentary
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