Sifat-Sifat Fisika Batuan Pulau Biak dan Pulau Supiori, Irian Jaya
DOI:
https://doi.org/10.33332/jgsm.geologi.v16i5.369Abstract
The stratigraphical units of Biak, Irian Jaya Quadrangle, scale 1:250.000 consist of the Tertiary volkanic and sedimentary rocks, the pre-Tertiary metamorphics and recent alluvial. The studied area is in Biak and Supiori Islands, Irian Jaya bounded by longitudes 135°45' - 136°23'E and latitudes 0°36' - 1°36'S. Thirty six rock samples from investigated area have been collected and analyzed in a laboratory. The physical characteristics of samples analyzed include density (?), porosity (ô), magnetic susceptibility (?), and velocity of seismic wave ( Vp and Vs ). The result shows that the value of densities are within the range of 1.86 - 2.60 gr/cc, permeability -6 2.31 - 35.27%, magnetic susceptibilities are whitin 2,2 - 32,23 x 10 cgs emu The value of wave velocities (Vp) are around 2.2 - 5.4 km/sec, and Vs are within 1.1 - 3.1 km/sec. The result of rock samples analysed in area indicates that density distribution of less than 2.0 gr/cc and permeability distribution of > 20% may have high degree of water saturation.
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Keywords : Rock physical, density, porosity, magnetic susceptibility, velocity of seismic wave
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References
Heryanto, R., 1990. Kerentanan Magnetik Awal dan NRM Batuan, seminar KBK Jurusan. Fisika FMIPA, ITB.
Hoshino, K., 1978. Physical Properties density and porosity, In: Untung, M. and Sato, Y. Gravity and Geological Studies in Jawa, pp. 145-158, The Geological Survey of Indonesia.
Masria M., Ratman N., Suwitodirjo K., 1981, Geologi Lembar Biak, skala 1:250.000, Pusat Penelitian dan Pengembangan Geologi
Untung, M. dan Akil, G.S., 1978. Physical Properties Seismic wave velocities, In : Untung, M. and Sato Y. (ed.) Gravity and Geological Studies in Jawa, pp. 158-160, The Geological Survey of Indonesia.
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