Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans

doi:10.1038/ncomms10317

CORC > 北京大学 > 地球与空间科学学院

	Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans
	Shen, Bing ; Dong, Lin ; Xiao, Shuhai ; Lang, Xianguo ; Huang, Kangjun ; Peng, Yongbo ; Zhou, Chuanming ; Ke, Shan ; Liu, Pengju
刊名	NATURE COMMUNICATIONS
	2016
关键词	MAGNESIUM ISOTOPE FRACTIONATION SULFATE REDUCTION ALKALINE ENVIRONMENTS ANAEROBIC OXIDATION MARINE-SEDIMENTS SULFUR-COMPOUNDS NORTH CHINA NEW-MODEL PRECIPITATION OXYGEN
DOI	10.1038/ncomms10317
英文摘要	Molar tooth structures are ptygmatically folded and microspar-filled structures common in early-and mid-Proterozoic (similar to 2,500-750 million years ago, Ma) subtidal successions, but extremely rare in rocks <750 Ma. Here, on the basis of Mg and S isotopes, we show that molar tooth structures may have formed within sediments where microbial sulphate reduction and methanogenesis converged. The convergence was driven by the abundant production of methyl sulphides (dimethyl sulphide and methanethiol) in euxinic or H2S-rich seawaters that were widespread in Proterozoic continental margins. In this convergence zone, methyl sulphides served as a non-competitive substrate supporting methane generation and methanethiol inhibited anaerobic oxidation of methane, resulting in the buildup of CH4, formation of degassing cracks in sediments and an increase in the benthic methane flux from sediments. Precipitation of crack-filling microspar was driven by methanogenesis-related alkalinity accumulation. Deep ocean ventilation and oxygenation around 750Ma brought molar tooth structures to an end.; Natural Science Foundation of China [41272017, 41322021, 41402025]; State Key Laboratory of Palaeontology and Stratigraphy [133103]; U.S. National Science Foundation [EAR-1528553]; SCI(E); ARTICLE; bingshen@pku.edu.cn; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438971]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Shen, Bing,Dong, Lin,Xiao, Shuhai,et al. Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans[J]. NATURE COMMUNICATIONS,2016.
APA	Shen, Bing.,Dong, Lin.,Xiao, Shuhai.,Lang, Xianguo.,Huang, Kangjun.,...&Liu, Pengju.(2016).Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans.NATURE COMMUNICATIONS.
MLA	Shen, Bing,et al."Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans".NATURE COMMUNICATIONS (2016).