摘要
深海热液区的热液物质喷发扩散会对周围海底的沉积物产生影响,研究沉积物中类脂物有助于进一步了解热液活动对其产生的影响。对东太平洋海隆西翼13°N附近E271和E272站位沉积物中的正构烷烃和脂肪酸进行了气相色谱-质谱(GCMS)分析。在两个站位的沉积物中检测到链长C_(11)-C_(35)的正构烷烃,其以双峰型分布为主,其中短链烷烃和长链烷烃分别指示了海洋细菌等微生物、陆源高等植物和热液物质的输入,且陆源输入主要来自大气输送的美洲物质。进一步,通过分析沉积物中正构烷烃的含量及组成,结果表明E272站位的沉积物经历了早期成岩作用。在两站位的沉积物中均检测到32种脂肪酸,其链长为C_(8)-C_(24)不等,总脂肪酸含量分别为93.55和50.71~87.05μg/g。同时,通过探讨沉积物中特征脂肪酸的组成和分布证实其受到了热液活动的影响。
The eruption and diffusion of hydrothermal materials will affect the surrounding sediments, and the study on the lipid in the sediments affected by hydrothermal activity is helpful to understand the influence of hydrothermal activity on sediments. In this research, Nalkanes and fatty acids in the sediments from E271 and E272 stations on the west flank of the East Pacific Rise near 13°N are analyzed by gas chromatography and mass spectrometry(GC-MS). C_(11)-C_(35) N-alkanes, which are mainly distributed in a bimodal pattern, are detected in the sediments, in which short-chain alkanes and long-chain alkanes indicate the inputs of marine bacteria, terrestrial higher plants and materials from hydrothermal activities, respectively. Terrestrial materials are mainly from the American continent transported by wind. Furthermore, the composition and distribution of n-alkanes in the sediments suggest that the sediments of E272 station have experienced early diagenesis. 32 types of fatty acids are detected in the sediments from the stations of E271 and E272, which ranged from C_(8)to C_(24), and the total fatty acid contents of the two stations are 93.55 and 50.71~87.05 μg/g, respectively. The composition and distribution of characteristic fatty acids in the sediments exhibit the characteristics of hydrothermal input, indicating that the sediments have been affected by hydrothermal activities.
作者
樊俊宁
曾志刚
朱博文
齐海燕
FAN Junning;ZENG Zhigang;ZHU Bowen;QI Haiyan(Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;University of Chinese Academy of Sciences,Beijing 100049,China;Center for Ocean Mega-Science,Chinese Academy of sciences,Qingdao 266071,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2022年第1期26-36,共11页
Marine Geology & Quaternary Geology
基金
国家自然科学基金“西太平洋俯冲体系中岩浆活动及其对热液物质供给的制约”(91958213)
中国科学院国际合作局对外合作重点项目“冲绳海槽热液活动成矿机理及其沉积效应”(133137KYSB20170003)
大洋“十三五”深海资源潜力评估项目“海底多金属硫化物及金属软泥的成矿机理”(DY135-G2-1-02)
泰山学者工程专项(ts201511061)
国家重点基础研究发展计划(973计划)项目“典型弧后盆地热液活动及其成矿机理”(2013CB429700)。
关键词
正构烷烃
脂肪酸
成岩作用
热液活动
N-alkanes
fatty acids
diagenesis
hydrothermal activity