Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans.

Abstract:

:Molar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (∼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 750 Ma brought molar tooth structures to an end.

journal_name

Nat Commun

journal_title

Nature communications

authors

Shen B,Dong L,Xiao S,Lang X,Huang K,Peng Y,Zhou C,Ke S,Liu P

doi

10.1038/ncomms10317

subject

Has Abstract

pub_date

2016-01-07 00:00:00

pages

10317

issn

2041-1723

pii

ncomms10317

journal_volume

7

pub_type

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