Geology and Petrogenesis of Igneous Rocks from Batur Paleovolcano, Gunungkidul, Yogyakarta: Evidence from their Textures, Mineralogy, and Major Elements Geochemistry

Fahmi Hakim; Yanuardi Satrio Nugroho; Cendi Diar Permata Dana; Anastasia Dewi Titisari

doi:10.22146/jag.48739

Geology and Petrogenesis of Igneous Rocks from Batur Paleovolcano, Gunungkidul, Yogyakarta: Evidence from their Textures, Mineralogy, and Major Elements Geochemistry

https://doi.org/10.22146/jag.48739

Fahmi Hakim^(1*), Yanuardi Satrio Nugroho⁽²⁾, Cendi Diar Permata Dana⁽³⁾, Anastasia Dewi Titisari⁽⁴⁾

(1) Geological Engineering Departement, Universitas Gadjah Mada
(2) Geological Engineering Departement, Universitas Gadjah Mada
(3) Geological Engineering Departement, Universitas Gadjah Mada
(4) Geological Engineering Departement, Universitas Gadjah Mada
(*) Corresponding Author

Abstract

Batur paleovolcano is located in Wediombo Beach area, Gunungkidul Regency, Yogyakarta and is being part of Wuni Formation. Several volcanic products including lava flow, autoclastic breccia and volcanic breccia can be found associated with diorite intrusions. This research is aimed to characterize geological, mineralogical andgeochemical variations of igneous rocks from Batur paleovolcano to understand its petrogenesis. Detailed geological mapping with scale of 1:12,500 is conducted to identify geological aspects and delineate igneous rocks distributions. Igneous rocks and selected wall rocks samples were prepared for laboratory analysis including 8 samples for petrography and 5 samples for ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry) analysis. Several geochemical data from previous study are also added to investigate the geochemical variations. Geological condition of the research area consists of four rock units including colluvial deposit, limestone, andesite lava and diorite intrusion. Geological structures found are normal fault and shear joint where the main stress direction is north–south. Petrography analysis showed that igneous rocks in this research area consist of diorite intrusion and andesite lava with phorphyritic texture. Plagioclase become the most abundant minerals found both as phenocryst phase and groundmass. Hornblende only occur as phenocryst phase in minor amounts as accesory mineral. Major elements
geochemistry analysis showed the rocks are characterized by intermediate silica with low alkali content. They are can be categorized as calc-alkaline series. However, some samples are fall into tholeiitic series. Major elements variation and textural study also indicate the magma is experienced differentiation process by fractional crystallization mechanism. This study suggests that igneous rocks from Batur paleovolcano is formed by two phases of formation. Earlier phase is the formation of andesite lava in island arc tholeiitic tectonic setting then at the later phase is formation of diorite intrusion in the calc-alkaline basalts tectonic setting.

Keywords

Ignous rocks , Batur paleovolcano ,Petrogenesis , Calc-alkaline basalt , Major elements ,Yogyakarta

Full Text:

PDF

References

Bemmelen, R.W. van (1949) The Geology of Indonesia, The Hague Martinus Nijhoff, Vol. 1A.

Cox, K.G., Bell, J.S., and Pankhurst, R.J. (1979) The Interpretation of Igneous Rocks: Allen and Unwin, London, 450p.

Dana, C. D. P., Noviana, A., Fadriand, W., Muzammil, and Titisari, A. D. (2017) Characteristic of Autoclastic Breccia Peniron Formation: an implication to magmatic evolution in Java Island, Proceeding of Joint Convention Malang 2017 HAGIIAGI- IAFMI-IATMI.

Hartono, G. dan Bronto, S. (2007) Asal-usul Pembentukan Gunung Batur di daerah Wediombo, Gunungkidul, Yogyakarta, Jurnal Geologi Indonesia, Vol. 2 (3), hal. 143–158.

Hendrawan, A. (2017) Genesa Batugamping Merah Di Daerah Siung Dan Sekitarnya, Kecamatan Tepus Dan Girisubo, Kabupaten Gunungkidul, Yogyakarta, Skripsi, Jurusan Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada.

Husein, S. (2013) Perkembangan Tektonik Pegunungan Selatan Yogyakarta: dari Busur Volkanik hingga Patahan Bongkah, Sebuah Kontribusi Pemikiran, Presentasi pada Seminar Nasional memperingati 30 tahun Stasiun Lapangan Geologi ’Prof. R. Soeroso Notohadiprawiro’ Bayat, Jurusan Teknik Geologi FT UGM.

Idrus, A., Setiadji, L.D., Warmada, IW., dan Mustakim, W.Y. (2014). Geologi dan Alterasi Hidrotermal di Gunung Batur, Wediombo, Kabupaten Gunung Kidul, Provinsi DI Yogyakarta, Prosiding Seminar Nasional Kebumian ke-7, Jurusan Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada, pp. 657–664.

Ismail, I. (2016) Studi Petrogenesis Andesit di Daerah Hargorejo dan sekitarnya, Kecamatan Bagelen, Kabupaten Purworejo, Provinsi Jawa Tengah, Skripsi, Jurusan Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada.

Johannsen, A. (1939) A Descriptive Petrography of the Igneous Rocks, University of Chicago. Kuno, H. (1966) Lateral variation of basalt magma type across continental margins and island arcs. Bulletin volcanologique, 29(1), 195-222.

McPhie, J., Doyle, L., and Allen, R. (1993) Volcanic Texture, CODES Key Centre, 211p. Mullen, E. D. (1983) MnO/TiO2/P2O5: a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis. Earth and Planetary Science Letters, 62(1), 53-62.

Peccerillo, A. and Taylor, S. R. (1976) Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to mineralogy and petrology, 58(1), 63-81.

Rollinson. H. R. (1993) Using Geochemical Data: evaluation, presentation, interpretation, JohnWilley & Sons Inc. New York. 380 p.

Setijadji, L. D. and Watanabe, K. (2009) Updated Age Data of Volcanic Centers in the Southern Mountain of Central-East Java Island, Indonesia. Prooceeding of International Conference Earth Science and Technology, Yogyakarta.

Setijadji, L. D., Kajino, S., Imai, A., and Watanabe, K. (2006) Cenozoic island arc magmatism in Java Island (Sunda Arc, Indonesia): clues on relationships between geodynamics of volcanic centers and ore mineralization. Resource Geology, 56(3), 267–292.

Sjarifudin, M.Z. and Hamidi, S. (1992) Peta Geologi Lembar Blitar skala 1:100.000, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Soeria-Atmadja, R., Maury, R. C., Bellon, H., Pringgoprawiro, H., Polve, M., and Priadi, B. (1994) Tertiary magmatic belts in Java. Journal of southeast asian earth sciences, 9(1-2), 13–27.

Streckeisen, A. (1978) IUGS Subcommission on the Systematics of Igneous Rocks. Classification and Nomenclature of Volcanic Rocks, Lamprophyres, Carbonatites and Melilite Rocks. Recommendations and Suggestions. Neues Jahrbuch fur Mineralogie. Stuttgart. Abhandlungen, 143, 1–14.

Surono, Toha, B., dan Sudarno, I. (1992) Peta Geologi Lembar Surakarta-Giritontro skala 1:100.000, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Toha, B., Purtyasti, R. D., Srijono, S., Rahardjo, W., dan Pramumijoyo, S. (1994) Geologi Daerah Pegunungan Selatan: Suatu Kontribusi. Geologi dan Geoteknik P. Jawa, Sejak Akhir Mesozoik hingga Kuarter, 19–36.

Wilson, M. (1989) Igneous Petrogenesis, Springer, Netherlands, 480p. 42

DOI: https://doi.org/10.22146/jag.48739