Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?
Bao, HM; Thiemens, MH; Loope, DB; Yuan, XL (袁训来)
2003-08-21
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
卷号30期号:16页码:4
摘要

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.

DOI10.1029/2003GL016869
语种英语
关键词[WOS]El-chichon Volcano ; Sulfur-dioxide ; 1982 Eruptions ; Oxidation ; Deposits ; Geochemistry ; Systematics ; Delta-o-17 ; Leachates ; Pathways
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000184998400001
出版者AMER GEOPHYSICAL UNION
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/1189
专题中国科学院南京地质古生物研究所
其他
通讯作者Bao, HM
作者单位1.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
2.Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
3.Univ Nebraska, Dept Geosci, Lincoln, NE 68588 USA
4.Acad Sinica, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China
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GB/T 7714
Bao, HM,Thiemens, MH,Loope, DB,et al. Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?[J]. GEOPHYSICAL RESEARCH LETTERS,2003,30(16):4.
APA Bao, HM,Thiemens, MH,Loope, DB,&Yuan, XL .(2003).Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?.GEOPHYSICAL RESEARCH LETTERS,30(16),4.
MLA Bao, HM,et al."Sulfate oxygen-17 anomaly in an Oligocene ash bed in mid-North America: Was it the dry fogs?".GEOPHYSICAL RESEARCH LETTERS 30.16(2003):4.
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