Eruption Age of Sakurajima-Satsuma Tephra Using Thermoluminescence Dating-猫眼课题宝

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2016

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N. Masaya;Yamamoto Junji

樱岛位于九州南部火山前沿，是日本一座非常活跃的火山。樱岛火山的火山灰层被统称为樱岛火山灰（Sz）群（小林，1986）。樱岛火山的喷发历史在火山灰地层学上被划分为以下三个阶段：老北岳、年轻北岳和南岳（小林和江崎，1997）。年轻北岳阶段的第一次喷发被命名为樱岛-萨摩（Sz-S或P14）火山灰（小林和江崎，1997），这是Sz群最大喷发的火山灰（例如森胁，1992）。来自樱岛火山的Sz-S是九州南部和樱岛火山周围海域的火山地层学、古环境研究（例如Moriwaki，1992年）和考古研究（例如Kodama，2001年）的关键标志，因为这个火山灰体积最大（约1000立方米）。11公里：小林和Tameike，2002）的樱岛tephras，是广泛分布在整个南部九州。因此，这一关键火山灰层（Sz-S）的年龄测定有望在许多领域的研究作出重大贡献。关于Sz-S的年龄，町田和荒井（1992年）报告了10，500 BP的放射性碳（C）年龄，作为使用β计数法获得的几个木炭年龄的平均值。Okuno（1997）获得了Sz群火山灰层中木炭样品和与火山灰密切相关的土壤物质的加速器质谱（AMS）C年龄。报告的C年龄见表1。Okuno（2002）根据表1所示的C年代估计为12，800 cal yrBP。樱岛-萨摩火山喷发年龄的热释光测年

Sakurajima, located on the southern volcanic front in Kyushu, is a very active volcano in Japan. Tephra beds from Sakurajima volcano are collectively designed as the Sakurajima-tephra (Sz) group (Kobayashi, 1986). The eruption history of Sakurajima volcano is classified tephrostratigraphically into the following three stages: Old Kitadake, Young Kitadake, and Minamidake (Kobayashi and Ezaki, 1997). The first eruption of the Young Kitadake stage is designated as Sakurajima-Satsuma (Sz-S or P14) tephra (Kobayashi and Ezaki, 1997), which is volcanic ash of the largest eruption of the Sz group (e.g. Moriwaki, 1992). Sz-S derived from Sakurajima volcano is a key marker for volcanic stratigraphy, palaeoenvironmental studies (e.g. Moriwaki, 1992), and archaeological studies (e.g. Kodama, 2001) in southern Kyushu and surrounding marine regions of Sakurajima volcano because this tephra, with the largest volume (ca. 11 km: Kobayashi and Tameike, 2002) of Sakurajima tephras, is widespread throughout southern Kyushu. Therefore, age determination of this key tephra layer (Sz-S) is expected to contribute greatly to studies in many fields. Regarding the ages of Sz-S, Machida and Arai (1992) reported a radiocarbon (C) age of 10,500 BP as an average of several charcoal ages obtained using the beta counting method. Okuno (1997) obtained accelerator mass spectrometry (AMS) C ages of charcoal samples from tephra beds of Sz group, and soil materials related closely to the tephra. The reported C ages are presented in Table 1. Okuno (2002) estimated it as 12,800 cal yrBP based on the C dates shown in Table 1. Eruption Age of Sakurajima-Satsuma Tephra Using Thermoluminescence Dating

Eruption Age of Sakurajima-Satsuma Tephra Using Thermoluminescence Dating

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