lipidbiomarkersandtheirstablecarbonisotopesinancientseepcarbonatesfromswtaiwanchina

	lipidbiomarkersandtheirstablecarbonisotopesinancientseepcarbonatesfromswtaiwanchina
	GUAN Hongxiang1 ; XU Lanfang 1; WANG Qinxian 4; CHEN Duofu 2; WU Nengyou2 ; MAO Shengyi 1
刊名	地质学报英文版
	2019
卷号	093 期号:001 页码:167
ISSN号	1000-9515
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 lowδ13C values(as low as?113.4‰)detected in samples JA-4,JA-5 and JX-8,these carbonates were revealed to be a result of AOM.Based on the variedδ13C 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 13C-depleted methane and 13C-enriched residual CO2 from methanogenesis was suggested for the carbonate of JX-8 due to the co-occurrence of a highly positiveδ13Ccarb value(+8‰)and a moderate 13C 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 C31αβ22S/(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).
语种	英语
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/19896]
专题	中国科学院广州能源研究所
作者单位	1.Key Laboratory of Gas Hydrate,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangdong 2.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Shandong 3.中国科学院大学 4.Shanghai Engineering Research Center of Hadal Science and Technology,College of Marine Sciences,Shanghai Ocean University
推荐引用方式 GB/T 7714	GUAN Hongxiang,XU Lanfang,WANG Qinxian,et al. lipidbiomarkersandtheirstablecarbonisotopesinancientseepcarbonatesfromswtaiwanchina[J]. 地质学报英文版,2019,093(001):167.
APA	GUAN Hongxiang,XU Lanfang,WANG Qinxian,CHEN Duofu,WU Nengyou,&MAO Shengyi.(2019).lipidbiomarkersandtheirstablecarbonisotopesinancientseepcarbonatesfromswtaiwanchina.地质学报英文版,093(001),167.
MLA	GUAN Hongxiang,et al."lipidbiomarkersandtheirstablecarbonisotopesinancientseepcarbonatesfromswtaiwanchina".地质学报英文版 093.001(2019):167.