scholarly journals Variability in Sulfur Isotope Records of Phanerozoic Seawater Sulfate

2020 ◽  
Vol 47 (18) ◽  
Author(s):  
Theodore M. Present ◽  
Jess F. Adkins ◽  
Woodward W. Fischer
Keyword(s):  
Sulfur Isotope ◽  
Seawater Sulfate

Sulfur-isotope evidence for recovery of seawater sulfate concentrations from a PTB minimum by the Smithian-Spathian transition

2019 ◽  
Vol 195 ◽  
pp. 83-95 ◽  
Author(s):  
Alan Stebbins ◽  
Thomas J. Algeo ◽  
Christian Olsen ◽  
Hiroyoshi Sano ◽  
Harold Rowe ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Seawater Sulfate ◽  
Isotope Evidence

scholarly journals Variability in sulfur isotope records of Phanerozoic seawater sulfate

2020 ◽  
Author(s):  
Theodore Michael Present ◽  
Jess Adkins ◽  
Woodward Fischer
Keyword(s):  
Sulfur Isotope ◽  
Seawater Sulfate

scholarly journals Variability in sulfur isotope records of Phanerozoic seawater sulfate

2020 ◽  
Author(s):  
Theodore Michael Present ◽  
Jess Adkins ◽  
Woodward Fischer
Keyword(s):  
Sulfur Isotope ◽  
Seawater Sulfate

Pyrite multiple-sulfur isotope evidence for rapid expansion and contraction of the early Paleoproterozoic seawater sulfate reservoir

2014 ◽  
Vol 389 ◽  
pp. 95-104 ◽  
Author(s):  
Clint Scott ◽  
Boswell A. Wing ◽  
Andrey Bekker ◽  
Noah J. Planavsky ◽  
Pavel Medvedev ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Rapid Expansion ◽  
Seawater Sulfate ◽  
Isotope Evidence

Revisiting Ediacaran sulfur isotope chemostratigraphy with in situ nanoSIMS analysis of sedimentary pyrite

Geology ◽  
2021 ◽  
Author(s):  
Wei Wang ◽  
Yongliang Hu ◽  
A. Drew Muscente ◽  
Huan Cui ◽  
Chengguo Guan ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Secondary Ion Mass Spectrometry ◽  
Size Change ◽  
Seawater Chemistry ◽  
Carbonate Associated Sulfate ◽  
Seawater Sulfate ◽  
Nanosims Analysis ◽  
Secondary Ion ◽  
Sedimentary Pyrite

Reconstructions of ancient sulfur cycling and redox conditions commonly rely on sulfur isotope measurements of sedimentary rocks and minerals. Ediacaran strata (635–541 Ma) record a large range of values in bulk sulfur isotope difference (Δ34S) between carbonate-associated sulfate (δ34SCAS) and sedimentary pyrite (δ34Spy), which has been interpreted as evidence of marine sulfate reservoir size change in space and time. However, bulk δ34Spy measurements could be misleading because pyrite forms under syngenetic, diagenetic, and metamorphic conditions, which differentially affect its isotope signature. Fortunately, these processes also impart recognizable changes in pyrite morphology. To tease apart the complexity of Ediacaran bulk δ34Spy measurements, we used scanning electron microscopy and nanoscale secondary ion mass spectrometry to probe the morphology and geochemistry of sedimentary pyrite in an Ediacaran drill core of the South China block. Pyrite occurs as both framboidal and euhedral to subhedral crystals, which show largely distinct negative and positive δ34Spy values, respectively. Bulk δ34Spy measurements, therefore, reflect mixed signals derived from a combination of syndepositional and diagenetic processes. Whereas euhedral to subhedral crystals originated during diagenesis, the framboids likely formed in a euxinic seawater column or in shallow marine sediment. Although none of the forms of pyrite precisely record seawater chemistry, in situ framboid measurements may provide a more faithful record of the maximum isotope fractionation from seawater sulfate. Based on data from in situ measurements, the early Ediacaran ocean likely contained a larger seawater sulfate reservoir than suggested by bulk analyses.

scholarly journals The minor sulfur isotope composition of Cretaceous and Cenozoic seawater sulfate

2016 ◽  
Vol 31 (6) ◽  
pp. 779-788 ◽  
Author(s):  
A. L. Masterson ◽  
Boswell A. Wing ◽  
Adina Paytan ◽  
James Farquhar ◽  
David T. Johnston
Keyword(s):  
Sulfur Isotope ◽  
Isotope Composition ◽  
Seawater Sulfate ◽  
Sulfur Isotope Composition

An evaporite-based high-resolution sulfur isotope record of Late Permian and Triassic seawater sulfate

2017 ◽  
Vol 204 ◽  
pp. 331-349 ◽  
Author(s):  
Stefano M. Bernasconi ◽  
Irene Meier ◽  
Stephan Wohlwend ◽  
Peter Brack ◽  
Peter A. Hochuli ◽  
...  
Keyword(s):  
High Resolution ◽  
Sulfur Isotope ◽  
Late Permian ◽  
Seawater Sulfate ◽  
Isotope Record
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