Older magma at Aso caldera than at Unzen stratovolcano in south west Japan as recorded through helium isotopes
Older magma at Aso caldera than at Unzen stratovolcano in south west Japan as recorded through helium isotopes
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通过氦同位素记录,阿苏火山口的岩浆比日本西南部云仙成层火山的岩浆更古老
DOI:
10.1038/s43247-022-00649-6
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发表时间:
2023
影响因子:
7.9
通讯作者:
D. Zhao
中科院分区:
文献类型:
--
作者:
Y. Sano;T. Kagoshima;M. Zhang;N. Takahata;T. Onoue;T. Shibata;Y. Nishio;A.-T. Chen;H. Lee;T.P. Fischer;D. Zhao
Stratovolcanoes form conical mountains by ejecta and lava, while caldera volcanoes have depressions caused by post caldera collapse. Few studies have investigated relationships between this morphology difference and discharged fluid geochemistry. Here we present helium isotope ratios of geothermal fluids and groundwater inside and outside the caldera of Mt. Aso, Japan, and compare these to helium ratios in groundwater at Mt. Unzen, a stratovolcano in the same tectonic field. We find that helium isotopes decrease in proportion to distance from the central part of the volcano. However, the helium isotopes of inferred magmas are lower in Mt. Aso relative to Mt. Unzen. We combine this result with seismic tomography data and suggest that Mt. Aso may not be receiving new mantle material to the magma reservoir. Thus, we conclude that the caldera volcano Mt Aso probably features older magma and more developed geothermal systems than the stratovolcano Mt. Unzen.
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影响因子:
0.8
作者:
M. Sakamoto;Y. Sano;H. Wakita
通讯作者:
H. Wakita
影响因子:
5.2
作者:
S. Williams;Y. Sano;H. Wakita
通讯作者:
H. Wakita
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
DOI:
--
发表时间:
1950
期刊:
--
影响因子:
--
作者:
H. Kuno
通讯作者:
H. Kuno
DOI:
10.1016/j.jvolgeores.2008.03.038
发表时间:
2008-07-30
影响因子:
2.9
作者:
Morikawa, N.;Kazahaya, K.;Nakama, A.
通讯作者:
Nakama, A.