Tectonic incorporation of the upper part of oceanic crust to overriding plate of a convergent margin: An example from the Cretaceous–early Tertiary Mugi Mélange, the Shimanto Belt, Japan
書誌事項
- 公開日
- 2005-06
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- DOI
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- 10.1016/j.tecto.2005.01.005
- 公開者
- Elsevier BV
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説明
Abstract A tectonic melange exposed on land is examined to reveal relationships between melange formation, underplating, and deformation mechanisms, focusing on the deformation of basaltic rocks. The studied Mugi Melange of the Shimanto Belt is composed of a shale matrix surrounding various blocks of sandstone, pelagic sediments, and basalts. The melange was formed during Late Cretaceous to early Tertiary times in a subduction zone under P – T conditions of 150–200 °C and 6–7 km depth as estimated from vitrinite reflectance and quartz veins fluid inclusions. The melange represents a range of deformation mechanisms; pressure solution with micro-scale cataclasis in the shale matrix, brittle tension cracking in the blocks, and ubiquitous strong cataclasis in the basal portion of basaltic layers. The cataclastic deformation in the basalts suggests a breakage of a topographic high in the seismogenic depth.
収録刊行物
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- Tectonophysics
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Tectonophysics 401 (3-4), 217-230, 2005-06
Elsevier BV