Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?

Details Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs? Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30phls1b&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 16, pp. HLS 1-1, CiteID 1843, DOI 10.1029/2003GL016869

Physics

11

Geochemistry: Isotopic Composition/Chemistry, Atmospheric Composition And Structure: Volcanic Effects (8409), Volcanology: Ash Deposits, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801)

Scientific paper

The oxygen and sulfur isotope compositions of sulfate, particularly the oxygen-17 anomaly, provide clues to the origin of sulfate. We report a variable oxygen-17 anomaly for water- and acid-leached sulfate from an Oligocene volcanic ash bed in the northern High Plains, U.S.A. We find no sulfate O-17 anomaly, however, in freshly collected ashes from recent eruptions around the world. The Oligocene paleoclimatic and sedimentary evidence argues against a hyperarid condition in the High Plains, thus a long-term background atmospheric sulfate accumulation is less likely the origin. Combining sulfur isotope data, we suggest that the anomalous sulfate was associated with volcanic eruptions in the west, but was not directly carried by ash-falls. Extreme dry-fog (sulfate haze) events resulting from tropospheric oxidation of volcanic sulfur gases might provide a viable explanation for the sulfates in the ash bed that carry the oxygen-17 anomaly.

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