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Rudarsko-geološko-naftni zbornik, Vol. 40 No. 4, 2025.

Original scientific paper

https://doi.org/10.17794/rgn.2025.4.3

ROCK MAGNETISM AND GEOCHEMISTRY ANALYSES OF SURFACE SEDIMENTS AT MAAR LAKE: STUDY CASE AT RANU KLAKAH, EAST JAVA, INDONESIA

Fathia Matondang orcid id orcid.org/0009-0006-3595-6602 ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Satria Bijaksana orcid id orcid.org/0000-0001-6374-4128 ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia *
Ulvienin Harlianti orcid id orcid.org/0000-0002-4867-1191 ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Ni Komang Tri Suandayani ; Faculty of Mathematics and Natural Sciences, Universitas Udayana, Badung, Bali, Indonesia
Yohansli Noya ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Putu Billy Suryanata orcid id orcid.org/0000-0001-6701-2311 ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Khalil Ibrahim ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Thomas Andre Maris Widagdo ; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
Mamilla Venkateshwarlu ; CSIR-National Geophysical Research Institute (CSIR-NGRI), Hyderabad, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
Animireddi Venkata Satyakumar orcid id orcid.org/0000-0002-7893-3199 ; CSIR-National Geophysical Research Institute (CSIR-NGRI), Hyderabad, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India

* Corresponding author.

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Abstract

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.

Keywords

Maar Lake; Lamongan Monogenetic Volcanic Field; rock magnetism; geochemistry; East Java

Hrčak ID:

334869

URI

https://hrcak.srce.hr/334869

Publication date:

27.8.2025.

Article data in other languages: croatian

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