Year: 1992
Type: article
Abstract: To investigate a fine structure of the 3He/4He ratio distribution in and around a single volcano, fumarolic gases, geothermal gases and waters were collected at 13 sites within the caldera of the Hakone volcano, Japan.The 3He/4He and 4He/20Ne ratios vary from 6.7 x 10-6 to 9.6 x 10-6, and 0.85 to 26, re spectively.The 3He/4He ratios, corrected for air contamination, of samples within the caldera are uniform and as high as those of magmatic fluids in the Japanese Islands.The 3He/4He ratios of two geothermal water samples outside the caldera are significantly lower than those of inside.The observed 3He/4He ratio distribution is interpreted as an indication of the presence of source magma with a high 3He/4He ratio beneath the volcanic region .
Source: GEOCHEMICAL JOURNAL
Authors: Minoru Sakamoto, Yuji Sano, Hiroshi Wakita
Institution: The University of Tokyo
Language: English
Subfield: Geochemistry and Petrology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2008286318