Tipe Magmatik Batuan Beku Formasi Gabon di Tinggian Karangbolong, Kebumen

Chusni Ansori, Fitriany A Wardhani

Abstract


Karangbolong High located in Java Southern Mountain range is dominated by volcanic rocks of Gabon Formation in the form of volcanic breccia, some intrusion bodies and lavas. Research on the type of magma at Karangbolong high has never been done. This activity is intended to know the distribution, change the type of magma and tectonic position.
This research includes field sampling and laboratory work which includes petrographic analysis using polarization microscope and geochemistry analysis 4 litho ICP-WRA for major element and ICP-WRA4B2 for trace elements and REE. Results of geochemistry analysis are.plot in Total Alkali Silica (TAS) diagrams, AFM diagram , SiO2 vs FeO(t) / MgO diagram, SiO2 Vs K2O and the spider diagram.for trace elements and REE.
Most of the igneous rocks at Karangbolong Region are andesite pyroxene, basaltic andesite and slightly basalt olivine. To the northward, igneous rocks are tend to more acid as reflected by the increase of SiO2, Na2O and K2O and the decreasing of MgO and Fe2O3 content. The affinity of the magma in the northern part is mostly Calc-Alkaline series (KR-18, KR-28, KR-6, KR-23) and slightly Island Arc Tholeiite as intrusion and lava at southern part (KR-33 and KR- 17). The tectonic position of rock formation resides in Island Arc Plate Margin. The Calk-alkaline magma is enriched with the light rare earth elements (LREE) compared to the Tholeiite magma, while trace element Sr, K, Rb, Ba, and Th strongly enriched in.


Keywords : Karangbolong High, igneous rock, magmatic type, tectonic position

Full Text:

PDF

References


Alzwar, M., Samodra, H., dan Tarigan, J.J., 1988; Pengantar Dasar Ilmu Gunungapi ,Nova, Bandung, 226h

Ansori C., Puswanto E., 2011; Mining Profile at South Gombong Karst Area Proceeding of International Conference and Field Seminar, Asian Trans-Disciplinary Karst Conference; (Yogyakarta) Polydoor & Faculty of Geography UGM; ISBN :978-602-8487-17-7

Ansori C., 2017; Geosite identification in Karangbolong High to support the developement of Karangsambung-Karangbolong Geopark, Global Colloquium on Geo Sciences and Engineering, IOP Publishing IOP Conf. Series: Earth and Environmental Science 118(2018) 012014

Asikin,S., Harsolumakso A.H., Busono H., Gafoer S., 1992;Peta Geologi Lembar Banyumas, P3G (Bandung)

Best, G., 1982; Igneous and Metamorphic Petrology; Freeman and Company, San fransisco, USA, 629 pp

Bemmelen R..W.Van, 1949; Geology of Indonesia, Vol 1.a.. Martinus Nijhoff, the Hague, Netherlands.

Cox, K.G. , Bell J. D. & R. J. Pankhurst. 1979; The interpretation of igneous rocks. London: Allen and unwin.

Fadhlin.,Shaban.G.,Wildan,N.H., 2018; Magmatisme Tholeitic pada Active Continental Margin di Serayu Bagian Utara dan Selatan Banyumas, Jawa Tengah. Jurnal Geologi dan Sumberdaya Mineral (JGSM), Vol 19, No 1, 2018, hal 15-30.

Gaol K.L., Sudradjat Y, Wardhana D; 2004; Citra Kerapatan Batuan Bawah Tanah Daearah Karst Gombong dan Hubungannya Dengan Potensi Air Tanah, Jurnal Geofisika 2004, No. 2, hal 7-13

Gill, J.B., 1981; Orogenic Andesites and Plate Tectonics, Springer – Verlag, 390h.

Harker, A. 1909; The natural history of igneous rocks. New York: Macmillan. 384 h. ,

Hartono G.H., Bronto,S.,2008; Magmatisme dan Stratigrafi Gunung Api Pegunungan Selatan, Daerah Istimewa Yogyakarta; STTNAS, 18-19 July 2008 in Yogyakarta

Irvine, T. N. & W.R. A. Baragar.1971; A guide to the chemical classification of the common rocks. Canada Journal of Earth Science. Vol.8, p 523 – 548

Macdonald,A.G.,1972; Volcanoes, Prentice-Hall, Inc. Englewood Cliffs, New Jersey,510h

Middlemost E.A.K.1994; Naming materials in the magma/igneous rock system. Earth Sci Rev 37, p 215–224.

Miyashiro, A., 1974;Volcanic rock series in island arcs and active continental margin. American Journal of Science. Vol.274, p 321 – 355

Nakamura, N., 1974;Determination of REE, Ba, Fe, Mg, Na ang K in carbonaceous and ordinary chondrites. Geochim. Cosmochim.Acta.Vol. 38, p 757 -775.

Peccerillo, R. dan Taylor, S. R., 1976; Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to Mineralogy and Petrology. Vol. 58, p 63─81

Pearce, J. A. & J. R. Cann. 1973; Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth Planet. Sci. Lett. Vol 19, p 290 – 300

Pearce, J. A. 1982; Trace element characterictics of lavas from destructive palte boundaries. In Andesites: Orogenic andesites and related rocks, R. S. Thorpe (ed.), p 525 – 548. Chicester: Wiley

Satyana, A.H., 2009; Disappearance of the Java's Southern Mountains in Kebumen and Lumajang Depressions :Tectonic Collapses and Indentations by Java's Transverse Major Fault Zones; International Conference Earth Science and Technology, Yogyakarta

Simkin, T., Siebert, L., McClelland, L., Bridge, D., Newhall, C., Latter, J.H., 1981; Volcanoes of the World: A Regional Directory, Gazetteer, and Chronology of Volcanism During the Last 10,000 Years. Stroudsburg, Penn: Hutchinson Ross, 240h

Soeriatmadja 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, 13-27

Sujanto, F. X., Siwindono, T., Sahudi, K., and Purnomo, E., 1994; Pandangan baru tektonik Neogen daerah sekitar Java axial ridge Banyumas- Kebumen, Kumpulan Makalah Seminar Geologi dan Geotektonik Pulau Jawa sejak Akhir Mesozoik hingga Kuarter, Geology Department University of Gadjah Mada, Yogyakarta, p. 27 – 52

Tobing, S.M., 2003; Inventarisasi Bitumen Padat dengan Out Crop Drilling di Daerah Ayah Kebumen, Jawa Tengah; Proceeding Kolokium Hasil Kegiatan Inventarisasi Sumberdaya Mineral, Direktorat Inventarisasi Sumberdaya Mineral, Bandung

Wilson, M., 1991; Igneous Petrogenesis, A Global Tectonic Approach, Harper Collins Academic, 2 nd published, London, England, 466 pp




DOI: http://dx.doi.org/10.33332/jgsm.geologi.20.2.63-74

Refbacks

  • There are currently no refbacks.


Copyright (c) 2019 Chusni Ansori, Fitriany A Wardhani

Indexing Site :
Google Scholar ISJD LIPI Portal Garuda IPI

Sinta(Science and Technology Index) Garuda(Garda Rujukan Digital Crossref


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

View JGSM Statistics