MISC

2003年

Magnetotelluric investigation of the hydrothermal system and heat source in the Muine-Toyoha geothermal area, Hokkaido, Japan

RESOURCE GEOLOGY
  • S Takakura
  • ,
  • N Matsushima

53
3
開始ページ
213
終了ページ
220
記述言語
英語
掲載種別
DOI
10.1111/j.1751-3928.2003.tb00170.x
出版者・発行元
WILEY-BLACKWELL

Magnetotelluric (MT) surveys were carried out around the Muine volcano, Hokkaido, Japan, where it is expected that the heat and metal source forming the polymetallic Ag-Pb-Zn-Cu-In Toyoha deposit is present at depth. Measurements were performed at 20 sites, 18 of which were located along a WSW-ENE profile traversing the north ridge of Mt. Mume. A resistivity model obtained from 2D inversion of the MT data shows subsurface specific conductive and resistive features. Conductive layers are present at the surface of Mt. Muine. The low resistivity is probably due to the clay-rich rocks associated with the hydrothermal alteration. A high resistivity layer, which corresponds to the pre-Tertiary Usubetsu Formation, crops out east of Mt. Muine and dips westward. At the west foot of Mt. Muine, relatively high resistive layers are widely exposed. The resistivity increases with depth and exceeds 1000 ohm-m. This fact indicates that this region is not influenced by the recent hydrothermal activity. An extremely conductive zone about 3-6 km wide and 6-9 km thick exists at a depth of 2 kin below Mt. Muine. This zone mostly corresponds to an elastic wave attenuation zone detected by a seismic survey. It is interpreted as a large hydrothermal reservoir or melted magma, which is a heat source of the hydrothermal system in this area.

Web of Science ® 被引用回数 : 3

リンク情報
DOI
https://doi.org/10.1111/j.1751-3928.2003.tb00170.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000186169200003&DestApp=WOS_CPL

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