Sulphur and carbon isotopes as tracers of past sub-seafloor microbial activity.

Abstract:

:Microbial life below the seafloor has changed over geological time, but these changes are often not obvious, as they are not recorded in the sediment. Sulphur (S) isotope values in pyrite extracted from a Plio- to Holocene sequence of the Peru Margin (Ocean Drilling Program, ODP, Site 1229) show a down-core pattern that correlates with the pattern of carbon (C) isotopes in diagenetic dolomite. Early formation of the pyrite is indicated by the mineralogical composition of iron, showing a high degree of pyritization throughout the sedimentary sequence. Hence, the S-record could not have been substantially overprinted by later pyrite formation. The S- and C-isotope profiles show, thus, evidence for two episodes of enhanced microbial methane production with a very shallow sulphate-methane transition zone. The events of high activity are correlated with zones of elevated organic C content in the stratigraphic sequence. Our results demonstrate how isotopic signatures preserved in diagenetic mineral phases provide information on changes of past biogeochemical activity in a dynamic sub-seafloor biosphere.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Meister P,Brunner B,Picard A,Böttcher ME,Jørgensen BB

doi

10.1038/s41598-018-36943-7

subject

Has Abstract

pub_date

2019-01-24 00:00:00

pages

604

issue

1

issn

2045-2322

pii

10.1038/s41598-018-36943-7

journal_volume

9

pub_type

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