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3-D electrical resistivity structure based on geomagnetic transfer functions exploring the features of arc magmatism beneath Kyushu, Southwest Japan Arc

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/66635

Title: 3-D electrical resistivity structure based on geomagnetic transfer functions exploring the features of arc magmatism beneath Kyushu, Southwest Japan Arc
Authors: Hata, Maki Browse this author
Uyeshima, Makoto Browse this author
Handa, Shun Browse this author
Shimoizumi, Masashi Browse this author
Tanaka, Yoshikazu Browse this author
Hashimoto, Takeshi Browse this author →KAKEN DB
Kagiyama, Tsuneomi Browse this author
Utada, Hisashi Browse this author
Munekane, Hiroshi Browse this author
Ichiki, Masahiro Browse this author
Fuji-ta, Kiyoshi Browse this author
Issue Date: 17-Jan-2017
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research: Solid Earth
Volume: 122
Issue: 1
Start Page: 172
End Page: 190
Publisher DOI: 10.1002/2016JB013179
Abstract: Our 3-D electrical resistivity model clearly detects particular subsurface features for magmatism associated with subduction of the Philippine Sea Plate (PSP) in three regions: a southern and a northern volcanic region, and a nonvolcanic region on the island of Kyushu. We apply 3-D inversion analyses for geomagnetic transfer function data of a short-period band, in combination with results of a previous 3-D model that was determined by using Network-Magnetotelluric response function data of a longer-period band as an initial model in the present inversion to improve resolution at shallow depths; specifically, a two-stage inversion is used instead of a joint inversion. In contrast to the previous model, the presented model clearly reveals a conductive block on the back-arc side of Kirishima volcano at shallow depths of ~50 km; the block is associated with hydrothermal fluids and hydrothermal alteration zones related to the formation of epithermal gold deposits. A second feature revealed by the model is another conductive block regarded as upwelling fluids, extending from the upper surface of the PSP in the mantle under Kirishima volcano in the southern volcanic region. Third, a resistive crustal layer, which confines the conductive block in the mantle, is distributed beneath the nonvolcanic region. Fourth, our model reveals a significant resistive block, which extends below the continental Moho at the fore-arc side of the volcanic front and extends into the nonvolcanic region in central Kyushu.
Rights: Copyright 2016 American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/66635
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋本 武志

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