Stratigraphy of the Miocene Series in the Hiki Hills, Saitama Prefecture, central Japan

Takahashi, Masaki; Yanagisawa, Yukio

doi:10.5575/geosoc.110.290

Cited by 13 publications

(1 citation statement)

References 24 publications

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“…2006). Although the Niwaya Unconformity represents only a short time gap (15.2–15.3 Ma; Takahashi & Yanagisawa 2004), normal faults with east–west or northwest–southeast minor extension are dominant in the Annaka Group. On the other hand, seismic reflection profiling proves the existence of a previous normal fault on the MTL that is associated with the formation of north‐dipping half‐grabens to the south (17–15 Ma; Takahashi et al .…”

Section: Age Constraints On Du and Normal Shearingmentioning

confidence: 99%

Structural evidence for large‐scale top‐to‐the‐north normal displacement along the Median Tectonic Line in southwest Japan

Fukunari¹,

Wallis²

2007

Island Arc

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The Median Tectonic Line (MTL) is a first‐order tectonic boundary that separates the Sanbagawa and Ryoke Metamorphic Belts. Strike‐slip movements on the MTL have been well documented by many workers. New field based structural studies in the Sanbagawa Belt close to the MTL reveal a large number of secondary faults and semibrittle shear bands indicating a top‐to‐the‐north normal sense of displacement. The strikes of these shear zones and their spatial distributions suggest that development of these structures is related to movements on the MTL. These results imply that the MTL has a large‐scale normal shear component on a regional scale that can help account for the exhumation of the Sanbagawa Belt. Our proposed history of the MTL can also account for changes in the geometry of folds in the Sanbagawa Belt.

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Section: Age Constraints On Du and Normal Shearingmentioning

confidence: 99%