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Emplacement of a layered mafic intrusion in the Shimanto accretionary complex of southwest Japan: Evidence from paleomagnetic and magnetic fabric analysis

Author(s)

K. Kodama

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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T. Byrne

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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J.C. Lewis

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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J.P. Hibbard

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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M. Sato

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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T. Koyano

Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan, and Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

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Doi:

https://doi.org/10.1130/2018.2534(08)

Published:

August 15, 2018

ABSTRACT

A 200-m-thick, near-vertical, middle Miocene (ca. 14 Ma), gabbroic sheeted intrusion in the Muroto area of the Shimanto accretionary complex of southwest Japan yields anisotropy of magnetic susceptibility (AMS) showing a magnetic foliation for the minimum axis (K_min) oblique (by ~70°) to the perpendicular of the intrusive contact. Assuming the K_min axis represents the paleovertical axis, these data suggest that the gabbroic sheet was not intruded into the host sediments horizontally. Paleomagnetic measurements of the gabbroic intrusion show an in situ mean direction of reversed polarity (declination/inclination [Dec/Inc] = 287°/–65°, α₉₅ = 3°) that is...

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Figures & Tables

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura

GSA Special Papers

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura
CONTAINS OPEN ACCESS

Author(s)

Geological Society of America

Volume

534

DOI:

https://doi.org/10.1130/SPE534

Copyright:

Gold Open Access: This chapter is published under the terms of the CC-BY license and is available open access on www.gsapubs.org.

ISBN electronic:

9780813795348

Publication date:

August 15, 2018