MEDAN GAYA BERAT PADA BATUAN OFIOLIT (ULTRAMAFIK) DI BEOGA, PAPUA DAN  IMPLIKASI TERHADAP GENESIS ALIH TEMPATNYA

Budi Setyanta; Bambang Suci Widijono

doi:10.33332/jgsm.geologi.v19i3.204

Authors

Budi Setyanta Pusat Survei Geologi
Bambang Suci Widijono Pusat Survei Geologi

DOI:

https://doi.org/10.33332/jgsm.geologi.v19i3.204

Abstract

In Beoga, Puncak Jaya, Papua, a group of ultramafic rocks consisting of piroxenite, dunite, serpentenite and peridotite are exposed. The distribution of these rocks are very large, lying alongside east - west direction, reaching 50 km and 100 km long. The gravity fields in this region exhibit an elliptic gravity anomaly pattern ranging from -25 to 160 mGals. The gravity modelling and geological analysis suggest that ophiolite has been fragmented and exposed due to obduction, caused by an interaction between Pacific oceanic and Australian granitic plates. This tectonic setting may cause Mulia and its surrounding area to be susceptible to geological hazards such as earthquake and landslides.

Â

Keywords : gravity potentials, ophiolite, genesis, geology potential

Downloads

Download data is not yet available.

References

Cann, J.R., 1970. New Model for The Structure of the Oceanic Crust, Nature, 226 : 928-930.

Coleman, R.G., 1971. Plate Tectonic Emplacement of Upper Mantle Peridotites Along Continental Edges, Journal of Geophysical Research, 86 : 1212-1222.

Darman, D & Sidi, F.H. (eds.), 2000i An Outline of the Geology of Indonesia, Indonesian Association of Geologist (IAGI), pp.180.

Dewey, J.F. Bird, J.M.and Moores, E., 1970. Ultramafics and Orogeny, with Models of the US Cordillera and the Tethys, Nature, 228 : 837-842.

-----------. 1976. Ophiolite Obduction, Tectonophysics, 31 : 93-120.

Dow, D.B. and U. Hartono, 1986, The Mechanism of Pleistocene Plate Convergence Along Northeastern Irian th Jaya, Proceedings 13 Annual Convention, Indonesian Petroleum Association, May 1984, p.145- 150.

------------, Robinson, G.B., Hartono, U. dan Ratman, N., 1986. Peta Geologi Irian Jaya, Indonesia, Skala 1:1.000.000, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Gaol, K.L., Permana, H., Kadarusman, A., Hananto, N.D., Wardana, D.D. dan Sudrajat, Y., 2005. Model Gaya Berat Pegunungan Bobaris-Meratus, Kalimantan Selatan dan Implikasi Tektoniknya, Jurnal Geofisika, HAGI, 2 : 2-9.

Gray, D.R. and Gregory, T.T., 2003. Ophiolite obduction and the Samail ophiolite : the behaviour of the underlying margin, In : Ophiolites in Earth History, Dilek. Y. & Robinson P.T. (eds), Geological Society, London Special Publications. 218, 449-465.

Harris, R., 2003. Geodynamic patterns of ophiolites and marginal basins in the Indonesian and New Guinea regions, In : Ophiolites in Earth History, Dilek. Y. & Robinson P.T. (Eds), Geological Society, London Special Publications. 218 : 481-505.

Hartono, U., Sukanta, U. and Ratman, N., 1989. Pre and Post Tertiary collision magmatic activity in Irian Jaya, th Indonesia, Proceedings 16 Regional Cong. On Geol. Min. and Hydrocarb. Res. of Southeast Asia, Jakarta, Indonesia; 61-71.

Moores, E.M. & Twiss, R.J., 1995. Tectonics, W.H. Freeman Inc., New York. Monnier, C., Girardeau, J., Pubellier, M. & Permana. H., 2000. Oophiolte de la chaine centrale d'Irian Jaya (Indonesie) evidences petrologiques et geochimiques pour une origine dans un basin arriere-arc. Earth and Planetary Sciences, 331 : 691-699.

Nicolas, A., I. Reuber and K. Benn, 1988. A New Magma Chamber model based on Stuctural studies in the Oman Ophiolith, Tectonophysics, 151 : 87-105.

Panggabean, H, Amiruddin, Kusnama, K. Sutisna, R.L. Situmorang, T.Turkandi dan B. Hermanto, 1995. Peta Geologi Lembar Beoga, Irian Jaya, Skala 1:250.000, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Pieters, P.E., Pigram, C.J., Trail, D.S. Dow, D.B., Ratman, N. and Sukamto, R., 1983. The Stratigraphy of Western Irian Jaya, Indonesia, Geological Research and Development Centre Bull. 8 : 14-48.

Pigram, C.J., and Panggabean, H., (1984). Rifting of the Nortern margin of the Australian continent and the origin of some microcontinents in estern Indonesia, Tectonophysics, 107 ; 331-353.

Pudja, I.P. dan Mudjiono, R., 1989. Mekanisme Pusat Gempa Bumi Sesar Tengah, Irian Jaya, Proceedings PIT HAGI XIV, Jakarta; 392-399.

Rais, J., 1979. International Gravity Standardization Net 1971 (IGSN), Proc.PIT III HAGI, Yogyakarta

Sapiie, B., Natawidjaya, D.H. & Cloos, M., 1999. Strike-slip tectonic of New Guinea : transform motion between the Caroline and Australian Plates. In Busono, I. & Alam, H. (eds) Development in Indonesian tectonics and structural geology. Proc. of Indonesian Association of Geologists. I : 1-12.

Sardjono, 1999. Gravity field and structure of the crust of the Banggai Island region, Eastern Indonesia, implications for tectonics and hydrocarbon prospecs, Jurnal Geologi dan Sumberdaya Mineral, IX (99) : 16-29.

------------, 2003. Anomali gaya berat dan dinamika kerak bumi, Majalah IAGI, Mei 2003.

Setyanta, B. dan Setiadi, I., 2006. Komplek Batuan Ultramafik Meratus sebagai Bagian dari Ofiolit Kerak Samudra ditinjau dari Aspek Geomagnetik dan Gaya Berat, Jurnal Sumber Daya Geologi, XVI, no.6, Pusat Survei Geologi : 335-348.

------------ , dan Setiadi, I., 2007. Anomali Gaya Berat dan Tataan Tektonik Sekitar Perairan Laut Banda dan Pulau Seram. Jurnal Sumber Daya Geologi, XVII, no.6, Pusat Survey Geologi : 408-419.

------------, dan Setiadi, I., 2008. Model geologi bawah permukaan daerah Muarawahau Hasil Analisis Anomali Gaya Berat Berdasarkan Estimasi Kedalaman dengan Metode Analisis Spectral, Jurnal Sumber Daya Geologi, XVI, no.6, Pusat Survey Geologi : 335-348.

Subagio, Widijono, B.S. & Sardjono, 2000. Model kerak lajur Meratus berdasarkan analisis data gaya berat dan magnet implikasi terhadap potensi mineral ekonomi, Seri Geofisika, no.1, Maret 2000, Pusat Penelitian dan Pengembangan Geologi : 47-67.

Telford, W.M., Geldart, L.P., Sherrif, R.E. and Keys, D.A., 1976. Applied Geophysics, Cambridge University Press, London, 860pp.

Visser W.A., and Hermes, J.J., 1962. Geological results of the exploration for oil in Netherlands New Guinea. Verh.Kon.Ned.Geol.Mijnbuowk.Genoot.,Geol.Ser., 20 : 1- 265.

Wiryosujono, S. and Tjokrosapoetro, S., 1978. Ophiolite in eastern Indonesia. Procceding of the third regional conference on the geology and mineral resources of S.E. Asia (ed. Prinya Nutalaya), 641-652. Asian Institute of Technology, Bangkok.