ID | 119254 |
Author |
Endo, Shunsuke
Shimane University
Kouketsu, Yui
Nagoya University
Aoya, Mutsuki
Tokushima University
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Keywords | Sanbagawa
oceanic subduction
exhumation
mafic and pelitic schists
Raman spectroscopy
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Content Type |
Journal Article
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Description | The Sanbagawa belt is a “coherent” oceanic subduction-type metamorphic region representing a rock package predominantly derived from oceanic crust and accreted at depths of 20–80 km (300–700 °C). The thermal structure and lithological layers are complexly deformed but semi-continuous, in contrast to more commonly reported subduction-related domains dominated by mélange. The coeval Shimanto accretionary complex records accretion at depths <15 km and the rocks are primarily terrigenous sediments. The Sanbagawa belt has a greater proportion of mafic rocks than the Shimanto complex, implying progressive peeling-off of oceanic plate stratigraphy with more basaltic oceanic crust slices accreted at deeper levels. Tectonic exhumation can be explained by three separate phases dominated by buoyancy-driven upflow, ductile thinning, and normal faulting.
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Journal Title |
Elements
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ISSN | 18115217
18115209
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NCID | AA12005404
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Publisher | GeoScienceWorld|Mineralogical Society of America
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Volume | 20
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Issue | 2
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Start Page | 77
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End Page | 82
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Published Date | 2024-04-01
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EDB ID | |
DOI (Published Version) | |
URL ( Publisher's Version ) | |
FullText File | |
language |
eng
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TextVersion |
Publisher
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departments |
Science and Technology
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