Volcanism in The Pre-Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo-Butak Formation in the Western Southern Mountains

  • Sri Mulyaningsih Geological Engineering of FTM-IST AKPRIND Yogyakarta,Jl. Kalisahak No. 28 Yogyakarta, Indonesia
  • Muchlis Muchlis Geological Engineering of FTM-IST AKPRIND Yogyakarta,Jl. Kalisahak No. 28 Yogyakarta, Indonesia
  • Nur W.A.A.T. Heriyadi Geological Engineering of FTM-IST AKPRIND Yogyakarta,Jl. Kalisahak No. 28 Yogyakarta, Indonesia
  • Desi Kiswiranti Geological Engineering of FTM-IST AKPRIND Yogyakarta,Jl. Kalisahak No. 28 Yogyakarta, Indonesia

Abstract

Kebo-Butak Formation was known to be the oldest volcanic rocks limited in regional terms in the lower Baturagung Hills, Gedangsari area, Gunungkidul Regency. The main constituents of the Kebo-Butak Formation consist of intersection of volcanic-clastic rocks and calcareous sediments, locally also found basalt lava with pillow structures; which distinguished it from other volcanic rock formations in the Southern Mountains. This study aims to determine the relationship of volcanic rocks exposed in Giriloyo with the Kebo-Butak Formation in the Baturagung Hills; the chronostratigraphy and the history of volcanic  activities that produced the volcanic rocks of Giriloyo. This research was approached by volcanic geological mapping using surface mapping suported by gravity anayses. From the bottom to the top of the frontier areas result volcaniclastic rocks consisting of black tuffs with several fragments of volcanic bombs with basalt composition intersecting with thin basaltic lava inserted by calcareous claystone having an age of N5-7 (Early Miocene); pyroxene-rich basalt volcanic sequence consists of thick layers of tuff with creamy-brown color intersecting with lava and breccia inserted by calcareous sandstone aged N7-8; dikes, lava and agglomerates with basaltic composition and lava and agglomerates with andesitic composition. Stratigraphically, the volcanic rocks exposed at Giriloyo correlated with the volcanic rocks exposed at Karangtalun (Wukirsari) were under the Semilir Formation, bordered with normal fault N210oE/77o, the hanging wall composed by light grey tuff of Semilir Formation. Gravity analyses found high anomalies below the Semilir Formation exposed at Karangtalun-Munthuk (east of study area) continued to below the Giriloyo area. The high anomalies were identified as the igneous/ignimbrite volcanic sequence. Descriptively and stratigraphically, the Giriloyo volcanic sequence are a part of Kebo-Butak Formation. The petrogenesis of the volcanic rocks will be discussed in further research to interpret magmatological properties, the evolving paleo-volcano, and the absolute age of the rocks.

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References

Bothe, A. Ch. D., 1929, Djiwo Hills and Southern Ranges, Excursion Guide, IVth Pacific Sci. Cong., Bandung, 23 p.

Bronto, S., MulyaningSih, S., Hartono, G., & Astuti, B. (2008). Gunung Api purba Watuadeg: Sumber erupsi dan posisi stratigrafi. Indonesian Journal on Geoscience, 3(3), 117-128.

Bronto, S. dan S. Mulyaningsih, 2001, Volcanostratigraphic development from Tertiary to Quaternary: A case study at Opak River, Watuadeg-Berbah, Yogyakarta, Abstr., 30th Ann. Conv. IAGI & 10th Geosea Reg. Cong., Sept. 10-12, 2001, Yogyakarta, 158.

Bronto, S., W. Rahardjo dan H.G. Hartono, 1999, Penelitian gunung api purba di kawasan Kali Ngalang, Kabupaten Gunungkidul, Daerah Istimewa Yogyakarta serta implikasinya terhadap pengembangan sumber daya geologi, Prosid. Seminar Nasional Sumber Daya Geologi, 40 th. Jurusan Teknik Geologi, F.T. UGM, Yogyakarta, 222-227.

Rahardjo, W., 1983, Paleoenvironmental Reconstruction of the Sedimentary Sequence of the Baturagung Escarpment Gunung Kidul Area, Central Java, Proceed. PIT XII IAGI, Yogyakarta, 6-8 Dec. 1983, 135-140.

Rahardjo, W., 2007, Prelimanary result of foraminiferal biostratigraphy of Southern Mountains Tertiary rock, Yogyakarta Special Province, abstrak, Seminar dan Workshop “Potensi Geologi Pegunungan Selatan dalam Pengembangan Wilayah”, Kerjasama PSG, UGM, UPN “Veteran”, STTNAS dan ISTA, Yogyakarta, 27-29 November 2007.

Rahardjo, W., Sukandarrumidi dan H.M. Rosidi, 1977, Peta Geologi Lembar Yogyakarta, Jawa, skala 1 : 100.000, Direktorat Geologi, Bandung.

Soeria-Atmadja, R., R.C. Maury, H. Bellon, H. Pringgoprawiro dan B. Priadi, 1994, Tertiary magmatic belts in Java, Journ. SE Asian Earth Sci., 9, 13-12.

Srijono dan S. Husein, 2007, Tinjauan geomorfologi Pegungan Selatan DIY/ Jawa Tengah: Telaah peran faktor endogenik dan eksogenik dalam proses pembentukan pegunungan, abstrak, Seminar dan Workshop “Potensi Geologi Pegunungan Selatan dalam Pengembangan Wilayah”, Kerjasama PSG, UGM, UPN “Veteran”, STTNAS dan ISTA, Yogyakarta, 27-29 November 2007.

Mulyaningsih, S., Husadani, Y. T., Devi, L. R., & Irawan, S. N. (2006). Analisis Distribusi Kerusakan Akibat Gempabumi 27 Mei 2006 Melalui Pendekatan Kegunungapian di Daerah Wonolelo dan Sekitarnya, Kabupaten
Bantul, Daerah Istimewa Yogyakarta.

Mulyaningsih, S., Muchlis, Heriyadi, N.W. A. A. T., Kiswiranti, D., (2018). Laporan Penelitian: Terapan Geologi Gunung Api dalam Geokonservasi, Geowisata dan Geoheritage di Gunung Sudimoro, Kecamatan Imogiri dan Pleret, Kabupaten Bantul, Daerah Istimewa Yogyakarta, tidak dipublikasikan, 114 halaman.

Mulyaningsih, S., dan Sanyoto, S., (2012). Geologi Gunung Api Merapi; Sebagai Acuan Dalam Interpretasi Gunung Api Komposit Tersier Di Daerah Gunung Gede-Imogiri Daerah Istimewa Yogyakarta, Prosiding Seminar Nasional Aplikasi Sains & Teknologi (SNAST) Periode III ISSN: 1979-911X Yogyakarta, 3 November 2012.

Mulyaningsih, S., Husadani, Y.T., Umboro, P., Sanyoto, S., dan Purnamawati, D.I., (2011). Aktivitas Vulkanisme Eksplosif Penghasil Formasi Semilir Bagian Bawah Di Daerah Jetis Imogiri, Jurnal Teknologi Technoscientia ISSN: 1979-8415 Vol.4No.1 Agustus 2011, 64-78.

Mulyaningsih, S., (2016). Volcanostratigraphic Sequences of Kebo-Butak Formation at Bayat Geological Field Complex, Central Java Province and Yogyakarta Special Province, Indonesia, Indonesian Journal on Geoscience Vol. 3 No. 2 August 2016: 77-94.

Rahardjo, W., 1983. Paleoenvironmental Reconstruction of the Sedimentary Sequence of the Baturagung Escarpment Gunung Kidul Area, Central Java, Proceed. PIT XII IAGI, Yogyakarta, 6-8 Dec. 1983, 135-140.

Rahardjo, W., 2007, Prelimanary result of foraminiferal biostratigraphy of Southern Mountains Tertiary rock, Yogyakarta Special Province, abstrak, Seminar dan Workshop “Potensi Geologi Pegunungan Selatan dalam Pengembangan Wilayah”, Kerjasama PSG, UGM, UPN “Veteran”, STTNAS dan ISTA, Yogyakarta, 27-29 November 2007.

Rahardjo, W., Sukandarrumidi dan H.M. Rosidi, 1977, Peta Geologi Lembar Yogyakarta, Jawa, skala 1 : 100.000, Direktorat Geologi, Bandung.

Smyth, H., Hall, R., Hamilton, J. and Kinny, P., 2005. East Java: Cenozoic basins, volcanoes and ancient basement. In Proceedings of the Indonesian Petroleum Association, 30th Annual Convention. Indonesian Petroleum Association.

Smyth, H.R., Crowley, Q.G., Hall, R., Kinny, P.D., Hamilton, P.J. and Schmidt, D.N., 2011. A Toba-scale eruption in the Early Miocene: The Semilir eruption, East Java, Indonesia. Lithos, 126(3-4), pp.198-211.

Soeria-Atmadja, R., R.C. Maury, H. Bellon, H. Pringgoprawiro dan B. Priadi, 1994, Tertiary magmatic belts in Java, Journ. SE Asian Earth Sci., 9, 13-12.

Srijono dan S. Husein, 2007, Tinjauan geomorfologi Pegungan Selatan DIY/ Jawa Tengah: Telaah peran faktor endogenik dan eksogenik dalam proses pembentukan pegunungan, abstrak, Seminar dan Workshop “Potensi Geologi Pegunungan Selatan dalam Pengembangan Wilayah”, Kerjasama PSG, UGM, UPN “Veteran”, STTNAS dan ISTA, Yogyakarta, 27-29 November 2007.

Zahirovic, S., Seton, M. and Müller, R.D., 2014. The Cretaceous and Cenozoic tectonic evolution of Southeast Asia. Solid Earth, 5, 227.

Zulfakriza, Z., Saygin, E., Cummins, P.R., Widiyantoro, S., Nugraha, A.D., Lühr, B.G. and Bodin, T., 2014. Upper crustal structure of central Java, Indonesia, from transdimensional seismic ambient noise tomography. Geophysical Journal International, 197, 630-635.
Published
2019-09-30
How to Cite
MULYANINGSIH, Sri et al. Volcanism in The Pre-Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo-Butak Formation in the Western Southern Mountains. Journal of Geoscience, Engineering, Environment, and Technology, [S.l.], v. 4, n. 3, p. 217-226, sep. 2019. ISSN 2541-5794. Available at: <https://journal.uir.ac.id/index.php/JGEET/article/view/2262>. Date accessed: 20 nov. 2019. doi: https://doi.org/10.25299/jgeet.2019.4.3.2262.