Physics – Geophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30whls2h&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 23, pp. HLS 2-1, CiteID 2210, DOI 10.1029/2003GL018694
Physics
Geophysics
6
Electromagnetics: Measurement And Standards, Exploration Geophysics: Magnetic And Electrical Methods, Physical Properties Of Rocks: General Or Miscellaneous, Volcanology: General Or Miscellaneous, Hydrology: Groundwater Transport
Scientific paper
We deduced the ζ potential of various rocks in Aso caldera from streaming potential measurements in laboratory. In contrast to the conventional observation that the ζ potential of crustal rocks is mostly negative under typical geologic conditions, almost half of the samples equilibrated with dilute KCl solution show positive values of ζ potential at pH 4.5-5.5. The samples showing positive ζ are characterized by relatively low SiO2 content and abundance of elements having high isoelectric points, and found to be localized around the summit of Mt. Takadake where the positive correlation between self-potential (SP) and altitude is observed. We emphasize that measurements of ζ potential of volcanic rocks are very important to give more appropriate interpretations of SP data from volcanic fields.
Hase Hayo
Hashimoto Tsutomu
Ishido Tsuneo
Sato Kachishige
Takakura Satoru
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