Year: 2022
Type: article
Abstract: 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 δ7Li values of +1-+3‰. The low δ7Li 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 δ7Li 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 δ7Li values, low Cl/Li ratios, and 87Sr/86Sr 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 indicate a common supply of slab-dehydrated fluids to the non-volcanic forearc region in SW Japan from PHS along the large faults, and Li isotope ratios will be a useful indicator to detect their contribution.
Source: GEOCHEMICAL JOURNAL
Authors: Rofiqul Umam, Masaharu Tanimizu, Hitomi Nakamura, Yoshiro Nishio, Ryo Nakai, Naoto Sugimoto, Yasunori Mori, Yuuki Kobayashi, Akane Ito, Shigeyuki Wakaki, Kazuya Nagaishi, Tsuyoshi Ishikawa
Institutions: Kwansei Gakuin University, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, University of Kochi, Kōchi University, Mie Prefecture Health and Environment Research Institute, Japan Agency for Marine-Earth Science and Technology, Marine Works Japan Ltd. (Japan)
Language: English
Subfield: Geochemistry and Petrology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
Awards: G1032882543, G2497799714, Geochemical research on the dynamic weakening of fluid-bearing earthquake faults, G5085279734, G5114258696, G532058015, Different dehydration modes of subducting plates in southwestern and northeastern Japan using multi-element isotopes of spring water, イオン-分子反応を利用した迅速同位体分析に基づく地下水流動解析, Development of non-traditional isotope proxies for groundwater hydrological study
OpenAlex ID: W4297671069