Petrogenesis of Volcanic Arc Granites from Bayah Complex, Banten, Indonesia

Authors

  • Jemi Saputra Ahnaf Padjadjaran University, Geological Engineering Faculty, Jl. Raya Bandung – Sumedang km 21, Jatinangor, Indonesia
  • Aton Patonah Padjadjaran University, Geological Engineering Faculty, Jl. Raya Bandung – Sumedang km 21, Jatinangor, Indonesia
  • Haryadi Permana Indonesian Institute of Sciences, Geotechnology Center, Jl. Sangkuriang, Bandung, Indonesia

DOI:

https://doi.org/10.25299/jgeet.2019.4.2.3171

Keywords:

Volcanic-arc, petrogenesis, S-type granite, agma differentiation, Bayah Complex

Abstract

This research aimed to reveal the petrogenesis of granitic rocks of Bayah Complex starting from magma differentiation to exposing event, this research also intended to determine the tectonic environment. The methods carried out in this research include field observation, petrographic analysis using polarized light microscopy, and geochemical analysis using X-Ray Fluorescence (XRF) and Inductively Coupled Mass Spectrometry (ICP-MS).

Petrographic analysis shows that Bayah granitic rocks are composed of quartz, plagioclase, and K-feldspar while the rest are amphibole, biotite, sericite, chlorite, epidote, and opaque. Based on its major oxide concentrations, Bayah granitic rocks classified as granite and diorite-quartz which have high-K calc-alkaline magma. 4 samples of granitic rocks showed the A/N+K+C > 1 molar ratios belonging to the peraluminous S-type granite index while the remaining 1 sample showed a molar ratio of A/N+ K+C < 1 and A/N+K > 1 which classified as metaluminous I-type granite. Accordingly, Bayah granitic rocks are S-type granite which crystallized from sediment-derived magma, the sediments itself estimated sourced from continental especially Malay Peninsula, Indonesian Tin Island, and Schwaner Mountains. During differentiation, the magma undergone crustal contamination reflected by the increase in both SiO2 0.51 wt% and Al2O3 1.95 wt%, and decrease in Fe2O3 + MgO 0.61 wt% from the pure composition of sediment-derived magma. Furthermore, the occurrence of crustal contamination also recognized from high concentrations of Rb and Ba which indicate the interaction of magma with the materials of continental crust.

Regard to the exposing event, Bayah granitic rocks approximated to be exposed due to regional tectonic activity which caused Orogenesa I in the Early Oligocene to the Late Oligocene. Moreover, based on the plot of trace elements especially Rb, Y, Nb, Ta, and Yb on Harker and tectonic discriminant diagrams, Bayah granitic rocks are formed on volcanic-arc active continental margins in accordance with regional tectonic setting.           

Downloads

Download data is not yet available.

References

Ahnaf, J.S., Patonah, A., Permana, H., 2018. Structure and Tectonic Reconstruction of Bayah Complex Area, Banten. Journal of Geoscience, Engineering, Environment, and Technology 03 (02), 77-85.

Chappell, B.W., White, A.J.R., 1974. Two Contrasting Granite Types. Pacific Geology 8, 173–174.

Chappell, B.W., White, A.J.R., 1992. I-and S-type ranites in the Lachlan Fold Belt. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 83(1-2), 1-26.

Clemens, J., Watkins, J.M., 2001. The fluid regime of high-temperature metamorphism during granitoid magma genesis. Contributions to Mineralogy and Petrology, 140(5), 600-606.

Clements, B., Hall, R., 2008. U-Pb Dating of Detrital Zircons from West Java Show Complex Sundaland Provenance. Proceeding of 32nd Indonesia Petroleum Association Annual Convention.

Clements, B., Hall, R., Smyth, H.R., and Cottam, M.A. 2009. Thrusting of a Volcanic Arc: a New Structural Model for Java. Petroleum Geoscience 15, 159-174.

Collins, W.J., Beams, S.D., White, A.J.R., Chappell, B.W., 1982. Nature and Origin of A-type Aranites with Particular Reference to Southeastern Australia. Contributions to mineralogy and petrology 80(2), 189-200.

Cox, K.G., Bell, J.D., Pankhurst, R.J., 1979. The interpretation of igneous rocks, George Allen and Unwin.

Hartono, U., Syafri, I., Ardiansyah, R., 2008. The Origin of Cihara Granodiorite from South Banten. Jurnal Geologi Indonesia 03 (02), 107-116.

Hutabarat, J., 2016. Geokimia Batuan Vulkanik Formasi Cikotok di Segmen Utara Kubah Bayah, Banten. Bulletin of Scientific Contribution 14 (02), 195-204.

Irvine, T.N., Baragar, W.R.A. 1971. A Guide to the Chemical Classification of the Common Volcanic Rocks. Canadian Journal of Earth Science 8, 523-548.

Johnson T. E., Hudson N. F. C., Droop G., 2001. Partial melting of the Inzie Head gneisses: The role of water and a petrogenetic grid in KFMASH applicable to anatectic pelitic migmatites. J. Metam. Geol. 19, 99-118.

Koolhoven, W.C.B., 1993. Geological map of Java, scale 1:100.000. Explanatory notes to sheet 14 (Bajah), 42p. Bandung: Geological Research and Development Centre (unpubl).

Maniar, P.D., Piccoli, P.M., 1989. Tectonic Discrimination of Granitoids. Geological Society of America, Bulletin 6, 129-198.

Montel, J.M. , Vielzeuf, D., 1997. Partial melting of metagreywackes, Part II. Compositions of minerals and melts. Contributions to Mineralogy and Petrology 128(2-3), 176-196.

Patonah, A., Permana, H., 2018. Basement Characteristic Western Part of Java, Indonesia: Case Study in Bayah Area, Banten Province. International Journal on Advanced Science Engineering Information Technology 08 (05), 2135-2141.

Patonah, A., Syafrie, I., Ayasa, H., 2014. New Perspective on High-Grade Metamorphic Regional in Bayah Complex, Banten Province, Indonesia. Proceeding 1st International Conference Geoscience for Energy, Mineral
Resources and Environment.

Peacock, M.A., 1931. Classification of igneous rock series. The Journal of Geology 39(1), 54-67.

Pearce, J.A., Harris, N.B.W., Tindle, A.G.W., 1984. Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks. Journal Petrology 25, 956-983.

Peccerillo, A. and Taylor, S.R., 1976. Geochemistry of Eocene Calc-alkaline Volcanic Rocks from the Kastamonu Area, Northern Turkey. Contribution to Mineralogy and Petrology 58, 63-81.

Shand, S.J., 1951. Eruptive Rocks. J. J. Wiley, New York.

Sribudiyani, Muchsin, N., Ryacudu, R., Kunto, T., Astono, P., Prasetya, I., Sapiie, B., Asikin, S., Harsolumakso, A.H., Yulianto, I., 2003. The Collision of the East Java Microplate and Its Implication for Hydrocarbon Occurrences in the East Java Basin. Proceeding of 29th Indonesian Petroleum Association Annual Convention.

Streckeisen, A., 1976. To each plutonic rock its proper name. Earth-science reviews 12(1), 1-33.

Sujatmiko, Santoso, S., 1992. Regional Geology Map Quadrangle Leuwidamar. Geological Development and Research Center, Bandung.

Sukarna, D., Mangga, S.A., Brata, K., 1993. Geology of the Bayah Area: Implication for the Cenozoic Evolution of West Java, Indonesa. Geology Society of Malaysia 33, 163-180.

Van Bemmelen, R.W., 1949. The Geology of Indonesia. Martinus Nijhoff, Den Haag. Villaros, A., 2010. Petrogenesis of S-type granite with particular emphasis on source processes: The example of the S-type granite of the Cape Granite Suite (Doctoral dissertation, Dissertation. Stellenbosch University).

White, A.J.R., 1979. Sources of Granite Magma. Geological Society of America Program with Abstracts 11, 539.

Widiaputra, T., Patonah, A., 2016. Metamorphic Rocks in Bayah Complex, Banten Province: A Study in Tectonic Environment. Proceeding Of Geosea XIV and 45th IAGI Annual Convention 2016 Ikatan Ahli Geologi Indonesia ( IAGI ), 885-939.

Yuwono, Y.S., 2004. Diktat Pengantar Petrogenesis. Geological Engineering Department. FITB, Bandung Institute of Technology, Bandung.

Downloads

Published

2019-06-30