Composition and origin of lipid biomarkers in the surface sediments from the southern Challenger Deep, Mariana Trench

doi:10.1016/j.gsf.2018.01.004

	Composition and origin of lipid biomarkers in the surface sediments from the southern Challenger Deep, Mariana Trench
	Guan, Hongxiang 1,2; Chen, Linying 3; Luo, Min 2,3; Liu, Lihua 1; Mao, Shengyi 1; Ge, Huangmin 3; Zhang, Mei 1; Fang, Jiasong 3; Chen, Duofu 2,3
刊名	GEOSCIENCE FRONTIERS
	2019
卷号	10 期号:1 页码:351-360
关键词	Mariana Trench Lipid biomarkers Organic matter Topography Hydrodynamics
ISSN号	1674-9871
DOI	10.1016/j.gsf.2018.01.004
通讯作者	Guan, Hongxiang(guanhx@ms.giec.ac.cn)
英文摘要	The surface sediments collected from the southern Mariana Trench at water depths between ca. 4900 m and 7068 m were studied using lipid biomarker analyses to reveal the origin and distribution of organic matters. For all samples, an unresolved complex mixture (UCM) was present in the hydrocarbon fractions, wherein resistant component tricyclic terpanes were detected but C-27-C-29 regular steranes and hopanes indicative of a higher molecular weight range of petroleum were almost absent. This biomarker distribution patterns suggested that the UCM and tricyclic terpanes may be introduced by contamination of diesel fuels or shipping activities and oil seepage elsewhere. The well-developed faults and strike-slip faults in the Mariana subduction zone may serve as passages for the petroleum hydrocarbons. In addition, the relative high contents of even n-alkanes and low Carbon Preference Indices indicated that the n-alkanes were mainly derived from bacteria or algae. For GDGTs, the predominance of GDGT-0 and crenarchaeol, together with low GDGT-0/Crenarchaeol ratios (ranging from 0.86 to 1.64), suggests that the GDGTs in samples from the southern Mariana Trench were mainly derived from planktic Thaumarchaeota. However, the high GDGT-0/crenarchaeol ratio (10.5) in sample BC07 suggests that the GDGTs probably were introduced by methanogens in a more anoxic environment. Furthermore, the n-alkanes C-19 - C-22 and the n-fatty acids C-20(:0) - C-22(:0) were depleted in C-13 by 3%0 compared to n-alkanes C-16 - C-18 and the n-fatty acids C-14(:0)-C-18(:0), respectively, which was interpreted to result from the preferential reaction of fatty acid fragments with carbon "lighter" terminal carboxyl groups during carbon chain elongation from the precursors to products. The abundance of total alkanes, carboxylic acids, alcohols and total lipids were generally increased along the down-going seaward plate, suggesting the lateral organic matter inputs play an important role in organic matter accumulation in hadal trenches. The extremely high contents of biomarkers in sample BC11 were most likely related to trench topography and current dynamics, since the lower steepness caused by graben texture and proximity to the trench axis may result in higher sedimentation rate. This paper, for the first time, showed the biomarker patterns in surface sediments of the Mariana Trench and shed light on biogeochemistry of the hardly reached trench environment. (C) 2018, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
资助项目	Qingdao National Laboratory for Marine Science and Technology[QNLM2016ORP0210] ; Qingdao National Laboratory for Marine Science and Technology[QNLM2016ORP0208] ; NSFC[91328208] ; NSFC[41373071] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB06030102] ; Shanghai Sailing Program[17YF1407800]
WOS关键词	NORMAL-ALKANE DISTRIBUTIONS ; GLYCEROL TETRAETHER LIPIDS ; ORGANIC-MATTER ; FATTY-ACIDS ; AUTHIGENIC CARBONATES ; PARTICULATE MATTER ; ISOTOPIC EVIDENCE ; HADAL TRENCHES ; ALKYL DIOLS ; SEA
WOS研究方向	Geology
语种	英语
出版者	CHINA UNIV GEOSCIENCES, BEIJING
WOS记录号	WOS:000451806300025
资助机构	Qingdao National Laboratory for Marine Science and Technology ; NSFC ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Shanghai Sailing Program
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/24259]
专题	中国科学院广州能源研究所
通讯作者	Guan, Hongxiang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
推荐引用方式 GB/T 7714	Guan, Hongxiang,Chen, Linying,Luo, Min,et al. Composition and origin of lipid biomarkers in the surface sediments from the southern Challenger Deep, Mariana Trench[J]. GEOSCIENCE FRONTIERS,2019,10(1):351-360.
APA	Guan, Hongxiang.,Chen, Linying.,Luo, Min.,Liu, Lihua.,Mao, Shengyi.,...&Chen, Duofu.(2019).Composition and origin of lipid biomarkers in the surface sediments from the southern Challenger Deep, Mariana Trench.GEOSCIENCE FRONTIERS,10(1),351-360.
MLA	Guan, Hongxiang,et al."Composition and origin of lipid biomarkers in the surface sediments from the southern Challenger Deep, Mariana Trench".GEOSCIENCE FRONTIERS 10.1(2019):351-360.