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  1. 防災科研関係論文

Groundmass crystallization in dacite dykes taken in Unzen Scientific Drilling Project (USDP-4)

https://nied-repo.bosai.go.jp/records/4312
https://nied-repo.bosai.go.jp/records/4312
ebaf0122-eb6c-40dd-b1cc-5f5613bb700c
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Groundmass crystallization in dacite dykes taken in Unzen Scientific Drilling Project (USDP-4)
著者 Satoshi Noguchi

× Satoshi Noguchi

en Satoshi Noguchi

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Atsushi Toramaru

× Atsushi Toramaru

en Atsushi Toramaru

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Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

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抄録
内容記述タイプ Other
内容記述 Groundmass textural and compositional analyses of the drilled dacite dykes of the Unzen Scientific Drilling Project (USDP-4) identify the feeder dyke of the 1990-1995 eruption and elucidate the crystallization process of dykes at depth. In the drilling depth range of 1582-1996 m ("conduit zone"), four dacite dykes were recognized. The groundmasses of all but one of these dykes have textures ranging from cryptocrystalline to microcrystalline aggregate of crystals < 10 μm across forming an equigranular mosaic of plagioclase, alkali feldspar, quartz, and pyrite. The samples include a small number of coarser-grained plagioclase microlites (20 μm to 0.3 mm long). The compositions of groundmass consisting only of grains < 10 μm plotted at the lower pressure (< 50 MPa) ternary minimum in the Qz'-Ab'-Or' system suggests that the crystallization of plagioclase, alkali feldspar, and quartz took place nearly simultaneously. The compositions of coarser plagioclase microlites and groundmass, the plagioclase microlite textures, and the phenocryst assemblages show significant differences from historical lavas exposed in the summit area. This implies the possibility that most of the dacite dykes are not feeder dykes for the lavas at the summit and remained beneath the surface, perhaps because of high viscosity associated with high SiO2. One sample C14-1-1 collected 1977 m, has a texture, composition, and phenocryst assemblage nearly identical to that of the dome lava of the 1990-1995 eruption, differing only in the presence of hydrothermal alternation. At this time we cannot definitely conclude that C14-1-1 was the feeder dyke for the 1990-1995 eruption until we can elucidate the time scale and the conditions governing hydrothermal alternation. © 2008 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : Journal of Volcanology and Geothermal Research

巻 175, 号 1-2, p. 71-81
ISSN
収録物識別子タイプ ISSN
収録物識別子 0377-0273
DOI
関連識別子 10.1016/j.jvolgeores.2008.03.037
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