Identification of pumice derived from historic eruption in the same volcano:: Case study for the Sakurajima-Bunmei tephra in the Miyazaki Plain@@@宮崎平野で見出された桜島文明テフラの例

Identification of pumice derived from historic eruption in the same volcano:: Case study for the Sakurajima-Bunmei tephra in the Miyazaki Plain@@@宮崎平野で見出された桜島文明テフラの例
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同一火山历史喷发产生的浮石的鉴定:宫崎平原樱岛-文明火山灰的案例研究

DOI:
10.5575/geosoc.2016.0003
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发表时间:
2016
期刊:
Journal of the Geological Society of Japan
影响因子:
--
通讯作者:
T. Hirata
T. Hirata
中科院分区:
--
文献类型:
--
作者:
Masafumi Ikuta;M. Niwa;T. Danhara;Tohru Yamashita;S. Maruyama;T. Kamataki;Tetsuo Kobayashi;Hideki Kurosawa;Y. Saito;T. Hirata

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已知的水化特性的火山玻璃碎片的折射率测量,使浮石样品从多个历史喷发事件的一个单一的火山的歧视。我们分析了矿物成分,进行了火山玻璃碎片的形态分类,并测量了玻璃碎片和斜方辉石的折射率,从樱花岛火山的本明,安荣和大正喷发的产物。分别测量了每个玻璃碎片中水合和非水合部分的折射率。使用飞秒激光烧蚀感应耦合等离子体质谱技术测定了玻璃碎片中58种元素的浓度,以比较采样玻璃碎片的元素浓度。分析成功地区分了文明,安英,大正喷发产物。根据上述分析和浮石层中含煤物质的放射性碳年龄数据,从宫崎平原南部获得的岩心样品中的浮石层被确定为樱岛-本明火山灰。浮岩层的分布表明樱岛-本明火山灰作为浮岩落存款到达了宫崎平原南部。
Refractive index measurements of volcanic glass shards with known hydration characteristics enable the discrimination of pumice samples from multiple historic eruption events of a single volcano. We analyzed mineral compositions, undertook a morphological clas-sification of volcanic glass shards, and measured the refractive index of glass shards and orthopyroxene from products of the Bunmei, An-ei, and Taisho eruptions of Sakurajima volcano. The refractive indi-ces of hydrated and non-hydrated parts within each individual glass shard were measured separately. Concentrations of 58 elements in the glass shards were determined using a femtosecond laser abla-tion–inductively coupled plasma–mass spectrometry technique, to compare elemental concentrations of the sampled glass shards. The analyses successfully discriminated the Bunmei, An-ei, and Taisho eruption products. Pumice layers in core samples obtained from the southern part of the Miyazaki Plain were identified as the Sakurajima-Bunmei tephra, based on the analyses described above and radiocarbon age data for coaly materials in the pumice layers. The distribution of the pumice layer suggests that the Sakurajima-Bunmei tephra reached the southern part of the Miyazaki Plain as a pumice fall deposit.
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DOI: --
发表时间: 2004
期刊: 第四紀研究 43・5
影响因子: --
作者:
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DOI: --
发表时间: 2004
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DOI: --
发表时间: 2005
期刊: 金大考古 47
影响因子: --
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