Bulletin of Scientific Contribution

The Cisanggarung area is located in Cimenyan District, Bandung Regency, an area composed of volcanic products that many thick outcrops are found and used as andesite mines managed by local communities. This study examines the characteristics of andesite in the Cisanggarung area using petrology, petrography, XRF, and ICP-MS so that petrogenesis can be interpreted. Andesite rocks in the Cisanggarung area have a sheeting joint structure and microscopically have porphyritic, trachytic, glomeroporphyritic, zoning, embayment, and sieve textures. The composition of this rock was plagioclase, pyroxenes, opaque minerals with the less content of secondary minerals such as chlorite and clay minerals. The magmatic affinity of this rock shows calc-alkaline series, precisely in tholeiitic island arc tectonic setting associated with subduction, which is characterized by TiO₂<1.3 wt.%. Magma presumably comes from a continent plate with a depth of 127.87-136.92 km. Magma in this area undergoes a middle-stage differentiation process, namely assimilation and fractionation crystallization. The magmatism process forms two stages of crystallization, starting from the slow cooling stage, followed by relatively fast magma to the surface.

Bas, M.J.L., Maitre, R.W.L., Streckeisen, A., Zanettin, B., 1986. A chemical classification of volcanic rocks based on the total alkali-silica diagram. J. Petrol. 27, 745–750. https://doi.org/10.1093/petrology/27.3.745

Dirk, M., 2008. Petrologi - geokimia batuan Gunung Api Tampomas dan sekitarnya. Indones. J. Geosci. https://doi.org/10.17014/ijog.vol3no1.20083

Gill, J.B., 1981. Orogenic Andesites and Plate Tectonics. Orog. Andesites Plate Tectonics. https://doi.org/10.1016/0377-0273(82)90060-9

Gill, R., 2010. Igneous Rocks and Processes A Practical Guide.

Hutchison, C.S., 1983. Economic Deposits and their Tectonic Setting, Economic Deposits and their Tectonic Setting. https://doi.org/10.1007/978-1-349-17039-5

Irvine, T.N., Baragar, W.R.A., 1971. A Guide to the Chemical Classification of the Common Volcanic Rocks. Can. J. Earth Sci. 8. https://doi.org/10.1139/e71-055

Ismail, I., Hendratno, A., 2016. Studi Petrogenesis Andesit di Daerah Hargorojo dan sekitarnya, Kecamatan Bagelen, Kabupaten Purworejo, Provinsi Jawa Tengah, in: Seminar Nasional Kebumian Ke-9.

McLennan, S.M., Hemming, S., McDaniel, D.K., Hanson, G.N., 1993. Geochemical approaches to sedimentation, provenance, and tectonics. Spec. Pap. Geol. Soc. Am. 284. https://doi.org/10.1130/SPE284-p21

Mullen, E.D., 1983. MnO/TiO2/P2O5: a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis. Earth Planet. Sci. Lett. 62. https://doi.org/10.1016/0012-821X(83)90070-5

Pearce, T.H., Gorman, B.E., Birkett, T.C., 1977. The relationship between major element chemistry and tectonic environment of basic and intermediate volcanic rocks. Earth Planet. Sci. Lett. 36, 121–132. https://doi.org/10.1016/0012-821X(77)90193-5

Peccerillo, A., Taylor, S.R., 1976. Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contrib. to Mineral. Petrol. 58, 63–81. https://doi.org/10.1007/BF00384745

Putra, N., Patonah, A., Prambada, O., 2021. FASIES VULKANIK DAERAH CISANGGARUNG DAN SEKITARNYA, KECAMATAN CIMENYAN, KABUPATEN BANDUNG, PROVINSI JAWA BARAT 5.

Soetoyo, Hadisantono, R.D., 1992. Geological map of Tangkuban Parahu, Volcano/Sunda Complex Volcano, West Java.

Streckeisen, A., 1976. To each plutonic rock its proper name. Earth Sci. Rev. 12, 1–33. https://doi.org/10.1016/0012-8252(76)90052-0

Sun, S.S., McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. Geol. Soc. Spec. Publ. 42. https://doi.org/10.1144/GSL.SP.1989.042.01.19

Thornton, C.P., Tuttle, O.F., 1960. Chemistry of igneous rocks--[Part] 1, Differentiation index. Am. J. Sci. 258. https://doi.org/10.2475/ajs.258.9.664

Travis, R.B., Mines., C.S. of, 1955. Classification of rocks. Colorado School of Mines, Golden, Colo.

Wilson, M., 2007. Igneous Petrogenesis: a Global Tectonic Approach, Springer.