Keywords
geology
plain
Yogyakarta
Quarternary
14C
How to Cite
Abstract
https://dx.doi.org/10.17014/ijog.vol1no2.20065
The uplift of Southern Mountains in Early Pleistocene has formed the Yogyakarta Basin. In this basin, the Merapi volcanic activity has been developing. Based on 14C dating in cinder deposits exposed at Cepogo, the volcanic activity took place since ±42 ka. While on the basis of K/Ar dating in andesitic lava at Bibi Volcano, the activity took place since 0.67 ma. The high in the south and the appearance of Merapi volcanic dome in the north had caused a fl at valley. The southern part of the valley is bounded by the Southern Mountains and the western part is bounded by the West Progo Mountains. In the present time, the lithology of the areas which are interpreted as a palaeo-valley is composed of black clay deposits. This black clay is a contact between the basement rocks and Merapi volcanic deposits. The black clay deposits exposed in the Progo River (Kasihan) has been developed since ±16.59 to 0.47 ka, while in the Opak River (Watuadeg) 6210 y BP. Younger black clay deposits intersecting with lahars are also exposed at the Winongo River and have an age of 310 y BP. The age data of volcanic stratigraphy shows that Merapi activities had taken place since ±6210 up to ±310 years ago.
References
Andreastuti, S.D., 1999. Stratigraphy and geochemistry of Merapi Volcano, Central Java, Indonesia: implication for the assessment of volcanic hazard. PhD Dissertation at University of Auckland, New Zealand, 455h.
Anonim, 2006. Blognya.aSMaRa.html, Tanya Jawab: Gempa @ Jogja-Jateng, 27 Mei 2006.
Van Bemmelen, R.W., 1949. The Geology of Indonesia. The Hague Martinus Nijnhoff, Vol IA: h.192-194, h.197-200, h.206-207.
Berthomier, P.C., 1990. Etude volcanoloque du Merapi (Center Java) Téphostratigraphie et chronologie- méchanismes éruptifs. PhD thesis, University of Blaise Pascal, Clermont-Ferrand, 115h.
Craig, H., 1961. Mass Spectrometer Analysis of Radiocarbon Standards. Radiocarbon, 3, p.1-3.
Faure, G., 1986. Principles of Isotope Geology. Second Edition. John Wiley & Sons. h.386-404.
Hamilton, W., 1979. Tectonic of the Indonesian Regions. United State Geological Survey. Prof. paper, 1078h.
Kadar, D., 1986. Neogene planctonic foraminiferal biostratigraphy of the south Central Java area, Indonesia. Edisi pertama, Pusat Penelitian dan Pengembangan Geologi, Bandung.
Kobayashi, H., 1974. Radiocarbon. Radiocarbon measurement, V, No. 3. Tokyo University, h.381-387.
Libby, WF., 1951. Radiocarbon Dating. University of Chicago Press. 204h.
Mulyaningsih, S., 1999. Rekonstruksi Bencana Alam Purba Di Daerah Kalasan dan Sekitarnya, Daerah Istimewa Jogjakarta. Tesis S-2 di Jurusan Teknik Geologi, FIKTM, Institut Teknologi Bandung, 157h.
Mulyaningsih, S., 2006. Geologi lingkungan di daerah lereng selatan Gunung api Merapi, pada waktu sejarah (Historical time). Disertasi di Departemen Teknik Geologi, Sekolah Tinggi Pascasarjana Institut Teknologi Bandung, tidak dipublikasikan. Dengan lampiran-lampiran 365h.
Murwanto, H., 1996. Pengaruh aktivitas Gunung Api Kuarter terhadap perkembangan lingkungan danau di daerah Borobudur dan sekitarnya. Tesis S2, Geografi Universitas Gajah Mada, Yogyakarta.
Newhall, C.G., Bronto, S., Alloway, B., Banks, N.G., Bahar, I., del Marmol, M.A., Hadisantono, R.D., Holcomb, R. T., McGeehin, J., Miksic, J.N., Rubin, M., Sayudi, S.D., Sukhyar, R., Andreastuti, S.D., Tilling, R. I., Torley, R., Trimble, D., dan Wirakusumah, A.D., 2000. 10,000 years of explosive eruptions of Merapi Volcano, Central Java: archeological and modern implications. Journal of Volcanology And Geothermal Resources, 100, h.9-50.
Rahardjo., W., Sukandarrumidi, dan Rosidi, H.M.D., 1977. Peta Geologi lembar Jogjakarta, Jawa skala 1:100.000, Edisi II. Pusat Penelitian dan Pengembangan Geologi. Bandung.
Rahardjo, W., 2000. Tinjauan geologi dan paleogeografi daerah dataran Gantiwarno, antara Prambanan – Klaten, Jawa Tengah. Proceedings of Indonesian Association of Geologists, the 29th Annual Convention, Bandung, preprint.
Ralph, E.K. dan Michael, H.N., 1971. Dating Carbon-14 Techniques for the Archaeologist. The M.I.T. Press. Cambridge, Mass. 48h.
Ratdomopurbo, A. dan Andreastuti, S.D., 2000. Pengantar Gunung api Merapi. BPPTK DIY, 44h.
Sibrava, V., 1987. Isotope Methods in Quarternary Geology, Contribution to the. Geologic Time Scale. American Association of Petroleum Geologist, h.165-170.
Stuiver, M., 1987. Radiocarbon Timescale Tested agains Magnetic and other Dating Methodes. Nature, 273, h.271-273.
Suess, H.E., 1954. Natural Radiocarbon Measurement by Acetylene Counting. Science, 120, h.1-3.
Suess, H., 1980. The Radiocarbon Record in Three Rings of the Last 8000 Years. Radiocarbon, 22, h.200-209.