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Calcium isotopes in evaporites record variations in Phanerozoic seawater SO (sub 4) and Ca

Clara L. Blattler and John A. Higgins
Calcium isotopes in evaporites record variations in Phanerozoic seawater SO (sub 4) and Ca
Geology (Boulder) (June 2014) 42 (8): 711-714

Abstract

Reconstructing variations in the major element chemistry of seawater provides constraints on how the global carbon and sulfur cycles have changed over geological time, but archives for this information are rare. This work generates a new independent record of ancient seawater composition, in particular the relative abundance of Ca and SO (sub 4) , through Ca isotope measurements in marine evaporites. Evaporite sequences that reach halite saturation record large Ca isotope variability if SO (sub 4) > Ca, whereas a small range in Ca isotope ratios is observed if Ca > SO (sub 4) . Analyses of geological evaporites indicate SO (sub 4) -rich seawater in the Neogene and Permian and Ca-rich seawater in the Cretaceous and Silurian. These results agree with previous reconstructions using fluid inclusions in halite, and demonstrate a new approach for extending our understanding of oceanic and geochemical evolution.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 8
Title: Calcium isotopes in evaporites record variations in Phanerozoic seawater SO (sub 4) and Ca
Affiliation: Princeton University, Department of Geosciences, Princeton, NJ, United States
Pages: 711-714
Published: 20140630
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2014-058222
Categories: Isotope geochemistryStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 201426
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, 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: 201431
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