The gravity and magnetic prediction for unique density in small Hill of Limestone of Jatibungkus in Central Java Agus Laesanpura, Warsa, E.J. Wahyudi
Institut Teknologi Bandung
Abstract
The density and succeptibilty of limestone is very distinct relative to the other rocks such as sandstone and Clay. In Jatibungkus the limestone as olistolith hill among the clay is partially exposed and very distinct. The olistolith fragment of limestone of one square km, among the others rock give contraste to the others. This idea is do for prediction the similar object in the other area hence the gross density and succeptibilty could be getting in. The gravity for microgal precision, and magnetic for nTesla precision is acquire for 70 measurement around and in the hill,the elevation of sites is known by precise measurement in several cm closed. The residual gravity separation using free hand method is applicable, as well as interpretation, the rock density and succeptibilty magnetic is also measured in the laboratory. The limestone is recognizing as high gravity anomaly of one mGal and low magnetic anomaly clearly distinct. The result of inverse modeling with density optimum shows that the density and susceptibility of geophysics measurement is closed to rock in laboratory. This result is applied to the other area for the prediction, we expect it for deformed rock.
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