9:30 AM - 9:45 AM
[HQR15-03] Luminescence age of Holocene sand dunes and alluvial lowlands at costal area in Tonbetsu plain, northern Hokkaido, Japan
Keywords:sand dune, alluvial lowland, pIRIR / OSL dating, Tonbetsu plain, Holocene
The results indicate that, 1) pIR150 dating is an effective tool to date the Holocene sand sized sediments in Tonbetsu plain, 2) it is possible that the sources of quartz are different depending on grain size or geologic period, because the OSL ages of fine grain quartz are reliable in the study area (Kondo et al., 2007), 3) the sand dunes have been formed from the inland side sequentially after ca. 5.7 ka following maximum of the Holocene transgression in central Tonbetsu plain, 4) in southeastern Tonbetsu plain, the sand dune formation has been continued until the late Holocene, with alterations of stable (inactive) stages and destruction events by storm surge, and 5) in northwestern Tonbetsu plain, the sand dune formation stopped by the late Holocene, or younger sand dunes close to the coast were eroded completely by waves.
We will also show the luminescence dating results of the alluvial lowland and lower fluvial terraces in the study area.
Fujita(2014) Hokkaido University Press, 272p.; Hamatonbetsu Town Education Board(2014) Hamatonbetsu Town Education Board, 223p.; Kondo et al. (2007) Quaternary Geochronology, 2, 260-265.; Murray and Wintle(2000)Radiation Measurements, 32, 57-73.; Reimann and Tsukamoto(2012) Quaternary Geochronology 10, 180-187.; Thiel et al. (2015), Quaternary Geochronology, 29, 16-29.; Thomsen et al. (2008)Radiation Measurements, 43, 1474-1486.