Analysis of The Bahal Temple III Site Using Combination Method of Geophysics

Abstract

The Bahal III temple is an ancient relics temple of the Hindu Kingdom. The research aims to know the underlayer structure of the Bahal III surface and to determine the minerals contents of the boulder sample in the Bahal III temple in the Portibi region, North Padang Lawas. The research methods are Geoelectric and geomagnetic, and XRD methods. The geoelectric method that used in this research was the Wenner-Schlumberger method in two lines. Line length is 155m with 32 electrodes and 5m distance each. The geomagnetic method was done by using 60 grids. Geoelectricity data processing used Res2Dinvand software while geomagnetic data processing used Mag2DC software. Data processing of layer contouring used surfer11 software. Data processing of the XRD test result used Match3 software. The findings showed that the andesite rock layer was found by using the geoelectric method with resistivity value 950 - 1500 Ωm suspected as the rock of temple forming in-depth 3-12m. Geomagnetic test results showed the susceptibility value 0.034(cgs unit) which is andesite rock. XRD test result for minerals contents of the temple boulder sample was dominated by mineral Silicon dioxide (SiO2) 88.8%, Ferric oxide (Fe2O3) 8.9 %, Magnesium oxide (MgO) 1.7% and Titanium dioxide (TiO2) 0.7 %.