This observational analysis reports the presence of magnetite and titanomagnetite in Ranu Klakah sediments, suggesting distinct sediment characteristics.
Ranu Klakah is a maar lake that is part of the Lamongan Monogenetic Volcanic Field (LMVF), East Java, Indonesia, which has a closed hydrological system. This study aims to understand the characteristics of Ranu Klakah surface sediments through rock magnetism and geochemical analyses. Tests were conducted on 16 sample points derived from surface sediments in the lake and springs around the lake. The results of rock magnetism analysis in Ranu Klakah surface sediments showed the presence of magnetite and titanomagnetite minerals. This is supported by XRD (X-Ray Diffraction) analysis, where the minerals magnetite, albite, and illite were found in sediments from inside the lake and springs around the lake. From the combined results of these two methods, it was concluded that the surface sediments in Ranu Klakah have pseudo-single-domain magnetite minerals type that originated from the weathering of rocks around the lake and there has been no diagenesis of the surface sediments in the lake due to the absence of results showing mineral changes in the samples tested.
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Matondang et al. (2025) studied this question.
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