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- W1487376120 abstract "Abstract This paper describes newly discovered pseudotachylyte along the A totsugawa F ault at the M agawa outcrop, where this fault divides Q uaternary deposits in the SW from T riassic H ida granitic rocks to the NE . Within several meters of the fault surface, pseudotachylyte veins are found with a thickness of less than 10 cm, but are displaced by fault brecciation. Zircon fission track dating of pseudotachylyte samples yields ages of 48.6–50.2 Ma (sample AT‐A ), 55.1 Ma ( AT‐A '‐1) and 60.9 Ma ( AT‐D ‐1); the latter is similar to the fission track ages of 56.1–60.1 Ma for granitic protoliths. The results of fission track length analyses in zircon suggest that pseudotachylytes ( AT‐A and AT‐D ‐1) and protolith granite are mostly annealed. Consequently, the pseudotachylyte ( AT‐A ) reached the highest temperature during 48.6–50.2 Ma, thereby resetting the fission track system totally in zircon during faulting. Another pseudotachylyte ( AT‐A '‐1) and its wall rock granite contain shortened tracks within zircon grains suggesting partial annealing. The age distribution pattern of the former also contains decomposed age after the normality test ( S hapiro– W ilk test) in which the major age yields 52.5 Ma. Accordingly, these pseudotachylytes yield a peak age of about 50 Ma, whereas the peak ages of one pseudotachylyte ( AT‐D ‐1) and the protolith Hida granitic rocks are about 60 Ma, representing the thermal effects not caused by frictional heating but by intrusions of L ate C retaceous to P aleogene granitoids that are probably concealed below the exposed T riassic H ida granitic rocks. Such thermal effects did not affect the K – A r muscovite age (149 Ma) for the protolith granite because of the higher closure temperature of this system. Using the new geochronological data, we can elucidate the cooling history of the H ida granitic rocks, and constrain the timing of the main pulse of pseudotachylyte generation along the A totsugawa F ault at about 50 Ma." @default.
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- W1487376120 date "2013-08-28" @default.
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- W1487376120 title "Geological framework and fission track dating of pseudotachylyte of the Atotsugawa Fault, Magawa area, central Japan" @default.
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- W1487376120 doi "https://doi.org/10.1111/iar.12036" @default.
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