Emplacement of a layered mafic intrusion in the Shimanto accretionary complex of southwest Japan: Evidence from paleomagnetic and magnetic fabric analysis
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Published:August 15, 2018
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CiteCitation
K. Kodama, T. Byrne, J.C. Lewis, J.P. Hibbard, M. Sato, T. Koyano, 2018. "Emplacement of a layered mafic intrusion in the Shimanto accretionary complex of southwest Japan: Evidence from paleomagnetic and magnetic fabric analysis", Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura, Timothy Byrne, Michael B. Underwood, III, Donald Fisher, Lisa McNeill, Demian Saffer, Kohtaro Ujiie, Asuka Yamaguchi
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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 (Kmin) oblique (by ~70°) to the perpendicular of the intrusive contact. Assuming the Kmin 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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Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura
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GeoRef
- accretionary wedges
- Asia
- Cenozoic
- emplacement
- Far East
- faults
- foliation
- gabbros
- igneous rocks
- intrusions
- Japan
- mafic composition
- magnetic declination
- Miocene
- Neogene
- ocean floors
- Oligocene
- Paleogene
- paleomagnetism
- plate tectonics
- plates
- plutonic rocks
- Shimanto Belt
- Tertiary
- thrust faults
- trenches
- Cape Muroto