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南海东北部冷泉区沉积物中有机质来源的生物标志物分析与环境指示意义
引用本文:丁玲,赵美训,于蒙,李莉,黄琦瑜.南海东北部冷泉区沉积物中有机质来源的生物标志物分析与环境指示意义[J].海洋学报(英文版),2017,36(10):8-19.
作者姓名:丁玲  赵美训  于蒙  李莉  黄琦瑜
作者单位:海洋化学理论与工程技术教育部重点实验室, 中国海洋大学, 中国 青岛;国土资源部海洋油气资源与环境地质重点实验室, 中国 青岛,海洋化学理论与工程技术教育部重点实验室, 中国海洋大学, 中国 青岛,海洋化学理论与工程技术教育部重点实验室, 中国海洋大学, 中国 青岛,海洋化学理论与工程技术教育部重点实验室, 中国海洋大学, 中国 青岛,成功大学地球科学系, 台南, 中国 台湾
摘    要:Multi-biomarker indexes were analyzed for two piston cores from potential cold seep areas of the South China Sea off southwestern Taiwan. Total organic carbon(TOC) normalized terrestrial(n-alkanes) and marine(brassicasterol, dinosterol, alkenones and iso-GDGTs) biomarker contents and ratios(TMBR, 1/Pmar-aq, BIT) were used to evaluate the contributions of terrestrial and marine organic matter(TOM and MOM respectively) to the sedimentary organic matter, indicating that MOM dominated the organic sources in Core MD052911 and the sedimentary organic matter in Core ORI-_(86)0-22 was mainly derived from terrestrial inputs, and different morphologies were the likely reason for TOM percentage differences. BIT results suggested that river-transported terrestrial soil organic matter was not a major source of TOM of sedimentary organic matter around these settings.Diagnostic biomarkers for methane-oxidizing archaea(MOA) were only detected in one sample at 172 cm depth of Core ORI-_(86)0-22, with abnormally high iso-GDGTs content and Methane Index(MI) value(0.94). These results indicated high anaerobic oxidation of methane(AOM) activities at or around 172 cm in Core ORI-_(86)0-22.However in Core MD052911, MOA biomarkers were not detected and MI values were lower(0.19–0.38), indicated insignificant contributions of iso-GDGTs from methanotrophic archaea and the absence of significant AOM activities. Biomarker results thus indicated that the discontinuous upward methane seepage and insufficient methane flux could not induce high AOM activities in our sampling sites. In addition, the different patterns of TEX_(86) and U_(37)~(K′) temperature in two cores suggested that AOM activities affected TEX_(86)37 temperature estimates with lower values in Core ORI-_(86)0-22, but not significantly on TEX_(86) temperature estimates in Core MD052911.

关 键 词:生物标志物  有机质来源  陆源有机质  海源有机质  甲烷厌氧氧化  南海
收稿时间:2016/4/13 0:00:00

Biomarker assessments of sources and environmental implications of organic matter in sediments from potential cold seep areas of the northeastern South China Sea
DING Ling,ZHAO Meixun,YU Meng,LI Li and HUANG Chi-Yue.Biomarker assessments of sources and environmental implications of organic matter in sediments from potential cold seep areas of the northeastern South China Sea[J].Acta Oceanologica Sinica,2017,36(10):8-19.
Authors:DING Ling  ZHAO Meixun  YU Meng  LI Li and HUANG Chi-Yue
Affiliation:1.Key Laboratory of Marine Chemistry Theory and Technology(Ocean University of China), Ministry of Education, Qingdao 266100, China;Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China2.Key Laboratory of Marine Chemistry Theory and Technology(Ocean University of China), Ministry of Education, Qingdao 266100, China3.Department of Earth Sciences, National Cheng Kung University, Tainan 701, Taiwan, China
Abstract:Multi-biomarker indexes were analyzed for two piston cores from potential cold seep areas of the South China Sea off southwestern Taiwan. Total organic carbon (TOC) normalized terrestrial (n-alkanes) and marine (brassicasterol, dinosterol, alkenones and iso-GDGTs) biomarker contents and ratios (TMBR, 1/Pmar-aq, BIT) were used to evaluate the contributions of terrestrial and marine organic matter (TOM and MOM respectively) to the sedimentary organic matter, indicating that MOM dominated the organic sources in Core MD052911 and the sedimentary organic matter in Core ORI-860-22 was mainly derived from terrestrial inputs, and different morphologies were the likely reason for TOM percentage differences. BIT results suggested that river-transported terrestrial soil organic matter was not a major source of TOM of sedimentary organic matter around these settings. Diagnostic biomarkers for methane-oxidizing archaea (MOA) were only detected in one sample at 172 cm depth of Core ORI-860-22, with abnormally high iso-GDGTs content and Methane Index (MI) value (0.94). These results indicated high anaerobic oxidation of methane (AOM) activities at or around 172 cm in Core ORI-860-22. However in Core MD052911, MOA biomarkers were not detected and MI values were lower (0.19-0.38), indicated insignificant contributions of iso-GDGTs from methanotrophic archaea and the absence of significant AOM activities. Biomarker results thus indicated that the discontinuous upward methane seepage and insufficient methane flux could not induce high AOM activities in our sampling sites. In addition, the different patterns of TEX86 and U37K'' temperature in two cores suggested that AOM activities affected TEX86 temperature estimates with lower values in Core ORI-860-22, but not significantly on TEX86 temperature estimates in Core MD052911.
Keywords:biomarkers  organic matter sources  TOM  MOM  anaerobic oxidation of methane  South China Sea
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