Changing mercury anomalies in Long Valley, California; indication for magma movement or seismic activity

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doi: 10.1130/0091-7613(1984)12<283:CMAILV>2.0.CO;2
Authors:Varekamp, Johan C.; Buseck, Peter R.
Author Affiliations:Primary:
Ariz. State Univ., Dep. Geol. and Chem., Tempe, AZ, United States
Volume Title:Geology (Boulder)
Source:Geology (Boulder), 12(5), p.283-286. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613
Publication Date:1984
Note:In English. 26 refs.; illus. incl. sketch maps
Summary:Mercury anomalies in soils in geothermal areas form as a result of vapor transport. Comparison of the Hg distribution measured in 1975, and again in 1982, indicates that a new Hg anomaly formed in the Inyo crater zone in the intervening period. Two models can explain this new anomaly: (1) geothermal water has reached shallow levels as a result of increased permeability created by seismic activity, or (2) addition of a CO2-rich, magnetic vapor to the geothermal system at depth caused vapor exsolution in zones where it did not occur before. If the Hg anomaly in the Inyo crater zone is related to the addition of magmatic vapors, the site of the new anomaly may overlie young, intruding magma. Modified journal abstract. [C.N.]
Subjects:Anomalies; Calderas; Geochemical indicators; Geochemistry; Geologic hazards; Geothermal systems; Intrusions; Magma chambers; Magmas; Seismicity; Soils; Surveys; Thermal waters; Trace elements; Volcanic features; California; Long Valley; Long Valley Caldera; Mono County California; United States
Coordinates:N373000 N380000 W1180000 W1190000
Abstract Numbers:87M/0996
Record ID:1984029746
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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