Publication Date:
2007-09-29
Description:
High-resolution geochemical analyses of organic-rich shale and carbonate through the 2500 million-year-old Mount McRae Shale in the Hamersley Basin of northwestern Australia record changes in both the oxidation state of the surface ocean and the atmospheric composition. The Mount McRae record of sulfur isotopes captures the widespread and possibly permanent activation of the oxidative sulfur cycle for perhaps the first time in Earth's history. The correlation of the time-series sulfur isotope signals in northwestern Australia with equivalent strata from South Africa suggests that changes in the exogenic sulfur cycle recorded in marine sediments were global in scope and were linked to atmospheric evolution. The data suggest that oxygenation of the surface ocean preceded pervasive and persistent atmospheric oxygenation by 50 million years or more.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaufman, Alan J -- Johnston, David T -- Farquhar, James -- Masterson, Andrew L -- Lyons, Timothy W -- Bates, Steve -- Anbar, Ariel D -- Arnold, Gail L -- Garvin, Jessica -- Buick, Roger -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1900-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742-4211, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901329" target="_blank"〉PubMed〈/a〉
Keywords:
*Atmosphere
;
Australia
;
Bacteria/metabolism
;
Geologic Sediments/*chemistry/microbiology
;
Oxidation-Reduction
;
*Oxygen
;
Seawater
;
South Africa
;
Sulfates/chemistry/metabolism
;
*Sulfur/chemistry/metabolism
;
Sulfur Isotopes/analysis
;
Time
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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