Rofiqul Umam, Rahmad Junaidi, Muhamad Syazali, Fajri Farid, Antomi Saregar, A. Andiyan, Hirotaka Takahashi
Optimization of the use of the Piper trilinear diagram was carried out by adding Lithium isotope systematics as a more accurate water-type analysis. The method used in this research is to analyze the Cl/Li ratio > 1000, δ7Li < 10 ‰, and Lithium concentration of groundwater, and then the results of the analysis are integrated into a Piper trilinear diagram. The research results show that Lithium isotope systematics (Cl/Li ratio < 1000, δ7Li < 10 ‰ and Li concentration) graph can be divided into 3 regions, namely geothermal water type has Cl/Li < 1000 and δ7Li < 10 ‰, then shallow groundwater which has Cl/Li > 1000 but δ7Li < 10 ‰ experienced natural contamination from geothermal waters, and fluid that has a Cl/Li ratio > 1000 and 10 ‰ > δ7Li > 20 ‰ is estimated to be shallow groundwater. © 2025 Tim Pengembang Jurnal UPI.
Faculty of Life and Environmental Sciences, University of Tsukuba, Japan; Center for Research in Radiation, Isotopes, and Earth System Sciences (CRiES), University of Tsukuba, Japan; Faculty of Science and Technology, Universitas Islam Negeri Sunan Ampel Surabaya, Indonesia; Department of Mathematics, the Republic of Indonesia Defense University, Indonesia; Data Science Study Program, Institut Teknologi Sumatera, Indonesia; Department of Physics Education, Universitas Islam Negeri Raden Intan Lampung, Indonesia; Faculty of Science and Engineering, Universitas Faletehan, Indonesia; Department of Design and Data Science and Research Center for Space Science, Tokyo City University, Japan; Institute for Cosmic Ray Research (ICRR), The University of Tokyo, Japan; Earthquake Research Institute, The University of Tokyo, Japan