Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China

doi:10.1111/1755-6724.13772

	Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China
	Guan Hongxiang 1,2; Xu Lanfang 1,3; Wang Qinxian 4; Chen Duofu 2,4; Wu Nengyou 2; Mao Shengyi 1
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2019-02-01
卷号	93 期号:1 页码:167-174
关键词	methane seeps lipid biomarkers anaerobic oxidation of methane weak seep settings
ISSN号	1000-9515
DOI	10.1111/1755-6724.13772
通讯作者	Guan Hongxiang(guanhx@ms.giec.ac.cn)
英文摘要	Four massive brecciated, chimney-like, and slender pipe network carbonate samples (JA-4, JA-5, JX-8 and BG-12) were collected from southwestern Taiwan, which were suggested to have formed as a result of anaerobic oxidization of methane (AOM). Considering that the environmental conditions of the carbonates precipitation and the sources of carbon and organic matter need to be further declared, molecular fossils and compound-specific carbon isotopic investigations of the carbonates were conducted in this study. According to lipid biomarkers of 2,6,10,15,19-pentamethyleicosane (PMI) and squalane diagnostic to methanotrophic archaea, as well as the extremely low C-13 values (as low as -113.4 parts per thousand) detected in samples JA-4, JA-5 and JX-8, these carbonates were revealed to be a result of AOM. Based on the varied C-13 values of characteristic archaea biomarkers in specific samples, biogenic methane was proposed to be responsible for the formation of samples JA-4 and JA-5, whereas a mixed carbon source of C-13-depleted methane and C-13-enriched residual CO2 from methanogenesis was suggested for the carbonate of JX-8 due to the co-occurrence of a highly positive C-13(carb) value (+8 parts per thousand) and a moderate C-13 depletion of PMI. The low content of AOM-related biomarkers and the absence of indicators for ANME-2 suggested that these carbonates were formed in weak seep settings. By comparison, no typical lipid biomarkers for methanotrophic archaea was detected in carbonate BG-12. The short-chain and long-chain n-alkanes accounted for 30% and 45% of all hydrocarbons, respectively, with a CPI value of 1.2, suggesting that the n-alkanes were derived from both marine organisms and terrestrial inputs. A low thermal maturity could be revealed by the incomplete equilibrium value of the C-31 22S/(22S+22R) ratio (0.5), and the carbonate BG-12 was probably deposited in a suboxic condition indicated by a value of Pr/Ph ratio (2.5).
资助项目	Qingdao National Laboratory for Marine Science and Technology[QNLM2016ORP0210] ; NSF of China[41473080] ; NSF of China[41673029]
WOS关键词	ANAEROBIC METHANE OXIDATION ; COLD SEEPS ; AUTHIGENIC CARBONATES ; BLACK-SEA ; REARRANGED HOPANES ; WESTERN FOOTHILLS ; CONVERGENT MARGIN ; HYDROCARBON-SEEP ; MARINE ; SEDIMENTS
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000461610000011
资助机构	Qingdao National Laboratory for Marine Science and Technology ; NSF of China
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/24746]
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 Mineral Resources, Qingdao 266061, Shandong, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.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,Xu Lanfang,Wang Qinxian,et al. Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2019,93(1):167-174.
APA	Guan Hongxiang,Xu Lanfang,Wang Qinxian,Chen Duofu,Wu Nengyou,&Mao Shengyi.(2019).Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,93(1),167-174.
MLA	Guan Hongxiang,et al."Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 93.1(2019):167-174.