Geochemical identification of individual glass shards from pyroclastic flow deposits intercalated in drill core at the Nagata River mouth in Kagoshima City, based on major and trace element compositions

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  • 火山ガラスの主成分および微量元素組成による鹿児島市永田川河口部で掘削されたボーリングコアに挟まれる火砕流堆積物の識別
  • カザン ガラス ノ シュセイブン オヨビ ビリョウ ゲンソ ソセイ ニ ヨル カゴシマシ ナガタガワ カコウブ デ クッサク サレタ ボーリングコア ニ ハサマレル カサイリュウ タイセキブツ ノ シキベツ

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<p>Drill core, known as the Taniyama boring core, from the mouth of the Nagata River in Kogoshima city, southwest Japan, contains five pyroclastic flow deposits. The Kakuto, Kobayashi, and Hiwaki (Shimokado) pyroclastic flow deposits were identified through particle composition analysis and the refractive index of glass shards in the flow deposits. However, two of the deposits do not correlate with the deposits reported in previous studies.</p><p>Many pyroclastic flow deposits occur in Kagoshima City and the surrounding areas. Some of these deposits have not been analyzed in terms of lithological features such as the major element compositions and trace element contents of volcanic glass shards. In addition, many deposits have not been clearly defined stratigraphically. It is necessary to review the major element compositions and trace element ratios of volcanic glass shards within these deposits to reconstruct the tephrostratigraphy of southern Kyushu.</p><p>In this study, five pyroclastic flow deposits, including the Kakuto, Oda, Kobayashi, and Hiwaki, pyroclastic flow deposits were sampled, and the major and trace element compositions of volcanic glass in the deposits were analyzed by Energy Dispersive X-ray spectrometry (EDX) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP–MS). The results show that the Kakuto, Oda, Kobayashi, and Hiwaki pyroclastic flow deposits can be identified from the major element composition of volcanic glass, whereas in the core, one pyroclastic flow deposit remains unidentified, although these deposits show diagnostic trace element compositions.</p>

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