MARINE GEOMAGNETIC ANOMALY BELT AND ITS RELATIONSHIP TO THE REMNANT ARCS IN THE NORTHWESTERN JAVA SEA, INDONESIA

Dida Kusnida, Lukman Arifin

Abstract


The continuous marine geomagneticsurvey within a timeintervalof1-secondsampling and a precision of 0.1 nT was conducted in the northwestern Java Sea to identify and interpret the general trend of total marine magnetic anomalies and the possibility related to thegeological resourcepotential. These magnetic data were then processed according to the formula corrected and applied to marine magnetic data. The total marine magnetic anomalies of the northwestern Java Sea indicate a well-defined lateral trend belt of anomaly contours. Anomalies are divided into four delineation zones: Zones I, II, III, and IV. A preliminary analysis of these anomalies led to the interpretation, reflecting the residual of a slightly east-west trending geological body underneath.Examination of magnetic anomalies suggests Zone I and IV characterize a basinalarea, Zone II depicts a granitic belt, and Zone III describes a Cretaceousmagmatic arc system in the east that extends from Middle Java across the Java SeathroughSouthern Kalimantan. These magnetic anomalies seem to coincide with the free air gravity anomalies data derived from TOPEX satellite data. 

 

Keywords


the northwestern Java Sea, total magnetic anomaly, remnant arc, granite

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References


Aryanto, N.C.D., Nasrun, Sianipar, A.H., and Sarmili, L., 2005. Granit Kelumpang sebagai granite tipe-I di Pantai Teluk Balok, Belitung. Jurnal Geologi Kelautan, 3(1): 19-27.

Auliya, I., Ramadhan, A., Darmaputra, M.K.M., Najah M.B., and Sucipta, I.G.B.E., 2021. Geochemical Characteristics of Schwaner Mountains Granitoids and their Relationship to Magmatism in the Southwest Borneo Block. Proceedings of Joint Convention Bandung (JCB) 2021: 775-778.

Aydin, A., Ferré, E.C. and Aslan, Z., 2007. The magnetic susceptibility of granitic rock as a proxy for geochemical composition: Example from the Saruhan granitoids, NE Turkey. Tectonophysics, 441: 85-95.

Ben-Avraham, Z., 1973. Structural framework of the Sunda shelf and vicinity. PhD Thesis, Woods Hole Oceanographic Institute & MIT, 269 pp.

Connelly, J.B., 1979. Interpretation of subsurface shape of granites in the eastern Lachlan fold belt using aeromagnetic data. Bulletin of the Australian Society of Exploration Geophysicists, 10 (1): 92-95.

Ferré, E.C., Wilson, J. and Gleizes, G., 1999. Magnetic susceptibility and AMS of the Bushveld alkaline granites, South Africa. Tectonophysics, 307: 113-133.

[Accessed on August 29, 2022]

Hall, R., Clements, B., and Smyth, H.R., 2009. Sundaland: Basement character, structure and plate tectonic development. Proceedings Indonesian Petroleum Association, 33rd Annual Convention: IPA09-G-134.

Ishihara, S., Hashimoto, M. and Machida, M., 2000. Magnetite/ilmenite series classification and magnetic susceptibility of the Mesozoic-Cenozoic plutons in Peru. Resource Geology, 50 (2): 123-129.

Kamei, A., & Takagi, T., 2003. Geology and petrography of the Abukuma granites in the Funehiki area, Fukushima Prefecture, NE Japan. The Journal of the Geological Society of Japan, 109(4): 234–251. doi:10.5575/geosoc.109.234

Kusnida, D., Azis, T. and Yuningsih, A., 2003. Total Magnetic Anomaly Map of Selat Karimata and Surroundings, Scale 1:1.000.000. Marine Geological Institute of Indonesia.

Kusnida, D., Astjario, P., and Nirwana, B., 2008. Magnetic Susceptibilities Distribution and Its Possibly Geological Significance of Submerged Belitung Granite. Indonesian Mining Journal, (11): 24 – 31.

Metcalfe, I., 2011. Palaeozoic–Mesozoic history of SE Asia. Geological Society, London, Special Publications, 355(1): 7–35. doi:10.1144/sp355.2

Satyana, A. H., Tarigan, R. L., Armandita, C., 2007. Collisional Orogens in Indonesia: Origin, Anatomy, and nature of Deformation. Proceedings Joint Convention Bali, The 32nd HAGI, The 36th IAGI, and the 29th IATMI Annual Conference and Exhibition.

Sudarmono, Suherman, T, and Eza, B., 1997. Paleogene basin development in Sundaland and its role to the petroleum systems in Western Indonesia. Proc. Indon. Petrol. Assoc., International Conference on Petroleum Systems of SE Asia and Australasia, 545-560.

Sunarya, Y. and Simanjuntak, W. 1987. Mineral Prospects in Southern Kalimantan Offshore. Proceedings of the 24th CCOP Session, 33-39.

Tarling, D.H. and Hrouda, F., 1993. The magnetic anisotropy of rocks. Chapman & Hall, London, 217p.




DOI: http://dx.doi.org/10.32693/bomg.37.1.2022.773