Detrital zircon dating

The estimated temperatures are lower than those extrapolated from borehole measurements (Sugihara et al., 2014).

This age spectra suggest that the provenance of detrital sediments in the Site C0002 is Honshu arc. This is obviously younger than shipboard nannofossil age (9.56-10.54 Ma) at 2245.5 mbsf, and this age reversal between 2245..0 mbsf strongly support the existence of thrust fault at 2400-2500 mbsf suggested by vitrinite reflectance analysis.

A total of 487 points in 450 zirkonkristaller analyzed for U-Th-Pb and the internal structures of the crystals have been studied by cathodoluminescence imaging. Diskordialinjer within the same crystal defines a more recentchanges lead loss.

Atta crystals provide a weighted mean value of 224 ?? Vi argue that the similarity in ages between the detrital zirkonerna from Mt.

Concordant 207Pb/206Pb ages range between 3109 ± ± 16 Ma (2σ), with three main age peaks at ca. 207Pb/206Pb ages of up to 4067 ± 5 Ma were found, but these were highly discordant.

At least two Pb-loss events are evident during the Neoarchean and Permian-Triassic.

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