GEOLOGY AND STRUCTURAL CONTROL ON MINERALISATION OF THE ARINEM AREA, GARUT, WEST JAVA

GEOLOGI DAN STUDI KONTROL STRUKTUR TERHADAP MINERALISASI DI DAERAH ARINEM, GARUT, JAWA BARAT

  • Alfend Rudyawan Bandung Institute of Technology, Indonesia
  • Muhammad Lugas Sujatmoko Bandung Institute of Technology, Indonesia
  • Yan Rizal Institut Teknologi Bandung, Indonesia
Keywords: Arinem, Geology, Hydrothermal Alteration, Structure-control mineralisation

Abstract

Exploration by PT Aneka Tambang in 1981 identified several promising mineral prospects in West Java, categorized as low- to high-sulfidation epithermal types. One such prospect is the Arinem area in Garut, which became the focus of this study. Spanning 0.46 km², this area is located 45 km from Garut city.

The data used in this research include field data and core samples from seven boreholes provided by PT ANTAM Tbk. This study aims to understand the geological and hydrothermal alteration processes of the region using field work measurements, petrographic, mineralographic, and ASD specTERRA

The study area consists of volcanic and volcaniclastic units, intruded by Pyroxene Andesite and Hornblende Andesite, with prominent hydrothermal alteration zones. The geological structures include the Left-Lateral Arinem Fault and the Right-Normal Arinem Fault, both of which control hydrothermal processes. Minerals such as pyrite, chalcopyrite, galena, and sphalerite were identified, with mineral veins trending north – south. The results suggest that Arinem is a part of an en-echelon structure arrays part of a larger left lateral strike slip system in West Java that cross-cut by the younger NE – SW dextral faults. This provides crucial insight into the geology, subsurface alteration and mineralization distribution, highlighting its significance for ongoing exploration efforts.

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References

Alzwar, M., Akbar, N., dan Bachri, S. (1992): Peta Geologi Lembar Garut dan Pameungpeuk, Jawa, skala 1: 100.000, Puslitbang Geologi, Bandung.

Antam (1993) Gold-silver deposit exploration report DMP, Mt. Papandayan area, Garut Regency, West Java Province (KP.DDU. 866/Jabar). Unpublished Report (in 78 Proceedings of 4th Asia Africa Mineral Resources Conference – 13 to 16 October 2014, Algiers-AlgeriaIndonesian), 68p

Arisbaya, I., Lestiana, H., Mukti, M. M., Handayani, L., Grandis, H., Warsa, Sumintadireja, P. (2021) Garsela Fault and other NE-SW active faults along the southern part of Java Island, IOP Conf. Series: Earth and Environmental Science 789 (2021) 012065, IOP Publishing, doi:10.1088/1755-1315/789/1/012065 1

Clements, B., & Hall, R. (2007): Cretaceous to Late Miocene Stratigraphic and Tectonic Evolution Of West Java.

Corbett, G. J., dan Leach, T. M. (1998): Southwest Pacific Rim gold-copper systems: structure, alteration, and mineralization, Society of Economic Geologists.

https://prosesweb.bmkg.go.id/wp-content/uploads/Ulasan-Guncangan-Tanah-Gempabumi-Bandung-18-September-2024-M-4.9.pdf (Diakses tanggal 4 November 2024).

Lawless, J. V., White, P. J., Bogie, I., Paterson, L. A., & Cartwright, A. J. (1998): Hydrothermal Models. Mineral Deposits in The Arc Setting: Exploration Based on Mineralization Service. Kingston Morrison Mineral.

Martodjojo, S. (1984): Evolusi Cekungan Bogor, Desertasi, Program Pasca Sarjana, Institut Teknologi Bandung, Tidak diterbitkan.

Morisson, G., Guoyi, D., dan Jareith, S. (1990): Textural Zoning in Epithermal Quartz Vein, Amira Project P, 247, 33.

Morrison, K. (1997): Important hydrothermal minerals and their significance. Geothermal and mineral Service Division, 7.

Noya, Y., Sukarna, D., Andi Mangga, S. (1994) The Nature of Mineralisation at the Cikotok Area, West Java. Makalah Ikatan Ahli Geologi Indonesia, Pertemuan Ilmiah Tahunan ke-23.

Pertamina BPPKA (1996) Petroleum geology of Indonesian basins: principles, methods, and application.

Pirajno, F. (1992): Hydrothermal alteration. Hydrothermal Mineral Deposits: Principles and Fundamental Concepts for the Exploration Geologist, 101-155.

Pirajno, F. (2009): Hydrothermal processes and wall rock alteration. Hydrothermal processes and mineral systems, 73-164.

Pulunggono, A. & Martodjojo, S. (1994): Perubahan Tektonik Paleogen–Neogen Merupakan Peristiwa Tektonik Terpenting di Jawa: Proceeding Geologi dan Geoteknik Pulau Jawa. Perecetakan Nafiri, Yogyakarta.

Purwanto, S. P., Harjanto, A., Rizkianto, Y., Fatchurohman, D. (2019): Tipe Deposit dan Mineralisasi Emas Daerah Arinem dan Sekitarnya, Kabupaten Garut, Jawa Barat, PROSIDING SNCPP 2019 “Pengembangan Ristek dan Pengabdian Menuju Hilirisasi Industri” LPPM UPN “Veteran” Yogyakarta Yogyakarta, 16 – 17 Oktober 2019.

Supendi, P., Nugraha, A. D., Puspito, N. T., Widiyantoro, S., Daryono (2018) Identification of active faults in West Java, Indonesia, based on earthquake hypocenter determination, relocation, and focal mechanism analysis, Geoscience Letter 5:31, https://doi.org/10.1186/s40562-018-0130-y.

Tim Pusat Studi Gempa Nasional (2017) Peta Sumber Dan Bahaya Gempa Indonesia Tahun 2017, Pusat Penelitian dan Pengembangan Perumahan dan Permukiman Badan Penelitian dan Pengembangan Kementerian Pekerjaan Umum dan Perumahan Rakyat, ISBN 978-602-5489-01-3

White, N. C., dan Hedenquist, J. W. (1995): Epithermal gold deposits: styles, characteristics and exploration, SEG newsletter, (23), 1–13.

Wibowo, E. P. W. (2017) : Geologi dan alterasi hidrotermal daerah arinem dan sekitarnya, kabupaten Garut, Jawa Barat, Perpustakaan digital ITB.

Widyariestha, M., Rosana, M.F., Haryanto, I., Kurniawan, A. (2019) Mineralization Characteristics Of Kiarapayung, Cibaliung District, Pandeglang, Banten, Journal Of Geological Sciences And Applied Geology Vol. 3 No. 1 April 2019

Yulianto, I., Hall, R., Clements, B., & Elders, C. R. (2007): Structural and Stratigraphic Evolution of The Offshore Malingping Block, West Java, Indonesia. Proc. 31st Ann. Conv. IPA, Jakarta, Indonesia.

Yuningsih, E. T., (2011) Compositional Variation of Au-Ag Telluride Minerals of Arinem Deposits, West Java. JSDG Vol. 21 No. 3.

Yuningsih, E. T., Matsueda, H. (2014) Mineralogical and Geochemical Signatures of Gold-Silver-Base Metal, Mineralization in Bantarhuni Vein of Arinem Deposit, Western Java, Indonesia, Proceedings of 4th Asia Africa Mineral Resources Conference – 13 to 16 October 2014, Algiers-Algeria.

Yuningsih, E. T., Matsueda, H., Setyaraharja, E. P., Rosana, M. F. (2010): Arinem Gold And Basemetal Mineralization West Java – Indonesia, Proceedings Pit Iagi Lombok 2010, The 39th IAGI Annual Convention and Exhibition.

Published
2025-05-27
Section
Buletin Sumber Daya Geologi