eprintid: 1474793
rev_number: 29
eprint_status: archive
userid: 608
dir: disk0/01/47/47/93
datestamp: 2016-03-17 16:12:05
lastmod: 2021-10-05 00:42:51
status_changed: 2016-03-17 16:12:05
type: article
metadata_visibility: show
creators_name: von Strandmann, PAEP
creators_name: Stueeken, EE
creators_name: Elliott, T
creators_name: Poulton, SW
creators_name: Dehler, CM
creators_name: Canfield, DE
creators_name: Catling, DC
title: Selenium isotope evidence for progressive oxidation of the Neoproterozoic biosphere
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F57
note: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
abstract: Neoproterozoic (1,000–542 Myr ago) Earth experienced profound environmental change, including ‘snowball’ glaciations, oxygenation and the appearance of animals. However, an integrated understanding of these events remains elusive, partly because proxies that track subtle oceanic or atmospheric redox trends are lacking. Here we utilize selenium (Se) isotopes as a tracer of Earth redox conditions. We find temporal trends towards lower δ82/76Se values in shales before and after all Neoproterozoic glaciations, which we interpret as incomplete reduction of Se oxyanions. Trends suggest that deep-ocean Se oxyanion concentrations increased because of progressive atmospheric and deep-ocean oxidation. Immediately after the Marinoan glaciation, higher δ82/76Se values superpose the general decline. This may indicate less oxic conditions with lower availability of oxyanions or increased bioproductivity along continental margins that captured heavy seawater δ82/76Se into buried organics. Overall, increased ocean oxidation and atmospheric O2 extended over at least 100 million years, setting the stage for early animal evolution.
date: 2015-12-18
date_type: published
official_url: http://dx.doi.org/10.1038/ncomms10157
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1103002
doi: 10.1038/ncomms10157
lyricists_name: Pogge Von Strandmann, Philip
lyricists_id: PPOGG57
actors_name: Pogge Von Strandmann, Philip
actors_id: PPOGG57
actors_role: owner
full_text_status: public
publication: Nature Communications
volume: 6
number: 10157
issn: 2041-1723
citation:        von Strandmann, PAEP;    Stueeken, EE;    Elliott, T;    Poulton, SW;    Dehler, CM;    Canfield, DE;    Catling, DC;      (2015)    Selenium isotope evidence for progressive oxidation of the Neoproterozoic biosphere.                   Nature Communications , 6  (10157)      10.1038/ncomms10157 <https://doi.org/10.1038/ncomms10157>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1474793/1/ncomms10157.pdf