Characterization of Thermal Waters Origin from the Back Arc Lampung Province, Indonesia: An Evaluation of Stable Isotopes, Major Elements, and Li/Cl Ratios

Mochamad Iqbal; Brenda Ariesty Kusumasari; Tedi Atmapradhana; Afi Candra Trinugraha; Endah Kinarya Palupi; Ikhsan Maulidi

doi:10.58524/ijhes.v2i1.171

Authors

Mochamad Iqbal Graduate School of Engineering, Kyoto University
Brenda Ariesty Kusumasari Graduate School of Engineering, Kyoto University
Tedi Atmapradhana Graduate School of Engineering, Kyoto University
Afi Candra Trinugraha Laboratory of Molecular Immunobiology, Nara Institute of Science and Technology (NAIST)
Endah Kinarya Palupi Graduate of Science and Technology, Kwansei Gakuin University https://orcid.org/0000-0001-7755-5424
Ikhsan Maulidi Graduate School of Natural Science & Technology, Kanazawa University

DOI:

https://doi.org/10.58524/ijhes.v2i1.171

Keywords:

thermal water, major elements, stable isotopes, chlorine-lithium ratio, sumatra

Abstract

This study reports chemical and isotope data from thermal water samples collected in the Natar area (back-arc Lampung province), Indonesia. Based on the geologic map, Lampung-Panjang Fault is the source of this thermal water appearance with Quaternary volcanic and metamorphic rock in the basement. It is located close to the Quaternary extinct volcano (Mount Betung) around 20 km to the southwest. Therefore, this study aims to provide information on geochemical characteristics and the origin of thermal waters in Natar's non-volcanic area. Variables such as stable isotopes, major, and Li/Cl ratios were analyzed. Furthermore, the thermal waters collected from a well in a different location have a moderate temperature ranging from 47Â°C to 54Â°C with 6.23 pH. Lithium and Chloride concentrations as well as Isotope Î´¹⁸O and Î´D ranges from 0.02 mg/L to 0.04 mg/L, 5.19 mg/L to 46.12 mg/L, -5.26 â€° to -2.65 â€°, and -5.26 â€° to -2.65 â€°, respectively. The stable isotope showed that the thermal water samples have a shift value of Ã³¹⁸O similar to hydrothermal water. The result also has a positive correlation with the distribution of the Li/Cl ratio plotted close to the magmatic water. Consequently, the Natar hot springs may have formed due to the magmatic process of Mount Betung Quaternary with a lower temperature than an active volcano.

Author Biographies

Mochamad Iqbal, Graduate School of Engineering, Kyoto University

Geological Engineering, Institut Teknologi Sumatera, Indonesia
Afi Candra Trinugraha, Laboratory of Molecular Immunobiology, Nara Institute of Science and Technology (NAIST)

Research Center for Food Technology and Processing, National Research and Innovation Agency (BRIN), Indonesia
Ikhsan Maulidi, Graduate School of Natural Science & Technology, Kanazawa University

Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Syiah Kuala, Indonesia

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