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Report No.
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System report and measured data from geological samples using the new (U-Th)/He dating system at Tono Geoscience Center, Japan Atomic Energy Agency

Yamada, Kunimi; Hanamuro, Takahiro  ; Tagami, Takahiro*; Yamada, Ryuji*; Umeda, Koji

In 1987, it was revealed that the (U-Th)/He ages of apatites might be cooling ages with very low temperature cooling. Because of the suggested useful possibility in geo- and thermochronology, the (U-Th)/He method has been quickly developed since 1990's. The (U-Th)/He method mainly applies to investigate the last event on a cooling or exhumation history of present rapid orogen and a thermal anomaly through an active fault at the present. Japan Atomic Energy Agency have jointly set up the lab of the (U-Th)/He dating in cooperation with Kyoto University and NIED. At the present stage, the accuracy and precision are roughly 20 and 10%, respectively, using the age known zircon from the Fish Canyon Tuff (FC3). In the presentation, we will introduce the ages of some age known samples.

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