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Evaporite deposition in the mid-Neoproterozoic as a driver for changes in seawater chemistry and the biogeochemical cycle of sulfur

John K. G. Prince, Robert H. Rainbird and Boswell A. Wing
Evaporite deposition in the mid-Neoproterozoic as a driver for changes in seawater chemistry and the biogeochemical cycle of sulfur
Geology (Boulder) (February 2019) 47 (4): 375-379

Abstract

We utilized a novel approach to modeling the oceanic sulfur cycle by combining delta 34S and Delta 33S curves from sulfate evaporite minerals in order to investigate redox conditions during the mid-Neoproterozoic. This technique allowed us to estimate the oxidized and reduced proportions of the total oceanic sulfur sink. Isotopic data from the mid-Neoproterozoic Minto Inlet Formation (Victoria Island, Northwest Territories, Canada; ca. 850 Ma) show a limited range (16.8 ppm + or -1.4 ppm) in delta 34S of seawater sulfate and a sulfur cycle that is strongly shifted toward the sulfate sink (pyrite burial fraction, (f)p, =0.2), suggesting oxidizing conditions in the ocean and atmosphere at the time of deposition. These evaporites and others, which were deposited contemporaneously within a huge intracontinental basin, acted as a chemical pump, removing sulfate from the oceans and oxygen from the atmosphere to be buried as sulfate evaporites.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 4
Title: Evaporite deposition in the mid-Neoproterozoic as a driver for changes in seawater chemistry and the biogeochemical cycle of sulfur
Affiliation: Carleton University, Department of Earth Sciences, Ottawa, ON, Canada
Pages: 375-379
Published: 20190226
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 73
Accession Number: 2019-024195
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019117
Illustration Description: illus. incl. geol. sketch map
N71°00'00" - N72°30'00", W118°00'00" - W110°00'00"
Secondary Affiliation: Geological Survey of Canada, CAN, CanadaUniversity of Colorado-Boulder, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201914
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