Combined tracers in hot spring waters across the Kii Peninsula, Japan: Implications for the origins of metamorphic fluids of the SW Japan forearc

Momose, Koki; Shiogama, Makoto; Hori, Masako; Kandori, Kazuhiko; Nishio, Yoshiro

doi:10.2343/geochemj.2.0637

Cited by 2 publications

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References 39 publications

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“…This conventional isotopic tracer in water molecule is powerful for quantitative estimation of mixing relationship between distinct reservoirs, but the signals of deep-seated fluids tend to be diminished easily through dilution by surface waters. Actually, the contribution of the slab-dehydrated fluids will be small in the eastern Kii area (Iwamori et al, 2020), and their intrinsic information is easily affected by the secondary processes at shallower depths (Momose et al, 2021). At this point, δ 7 Li value will be the most robust isotopic tracer for the detection of the slab-dehydrated fluid.…”

Section: -2 Origin Of LI Isotopic Variation Among Groundwaters In The...mentioning

confidence: 99%

Lithium isotope systematics of Arima hot spring waters and groundwaters in Kii Peninsula

et al. 2022

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Slab-dehydrated fluid is considered to be involved in island arc magmatism. In this study, Li isotope ratios were determined for deep groundwater samples from the non-volcanic forearc region of SW Japan. The contribution of the slab-dehydrated fluid from the Philippine Sea Plate (PHS) was investigated in the Arima area and the eastern Kii Peninsula area, corresponding to the slab depths of ~60 km and 20-30 km, respectively. In the Arima area, the high-temperature thermal waters with high salinity called the Arima-type fluid were clarified to have low δ 7 Li values of +1-+3‰. The low δ 7 Li values with high Li concentrations are thought to be the result of fluid-rock interactions at high temperatures, which is consistent with the characteristics of the slab-dehydrated fluid. On the other hand, the δ 7 Li values of deep groundwaters in the eastern Kii Peninsula showed a wide range of +2 to +29‰. Several groundwater samples had a similar chemical property to the Arima-type fluid: low δ 7 Li values, low Cl/Li ratios, and 87 Sr/ 86 Sr ratios around 0.708-0.710. They are distributed along the Median Tectonic Line (MTL) and within about 20 km south of the MTL. These results

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Section: -2 Origin Of LI Isotopic Variation Among Groundwaters In The...mentioning

confidence: 99%

Lithium isotope systematics of Arima hot spring waters and groundwaters in Kii Peninsula

et al. 2022

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Fluid flowrates and compositions and water–rock interaction in the Hikurangi margin forearc, New Zealand

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Combined tracers in hot spring waters across the Kii Peninsula, Japan: Implications for the origins of metamorphic fluids of the SW Japan forearc

Cited by 2 publications

References 39 publications

Lithium isotope systematics of Arima hot spring waters and groundwaters in Kii Peninsula

Lithium isotope systematics of Arima hot spring waters and groundwaters in Kii Peninsula

Fluid flowrates and compositions and water–rock interaction in the Hikurangi margin forearc, New Zealand

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