STRUKTUR BAWAH PERMUKAAN BATUAN IGNIMBRITE PADA

KALDERA PANGKAJENE SULAWESI SELATAN

Subsurface Structure Of Ignimbrite Rocks In Pangkajene Caldera South Sulawesi

Ulva Ria Irfan¹⁾, Aryadi Nurfalaq²⁾, Kaharuddin^1), Haerany Sirajuddin^1), Hamid Umar¹⁾

Jurusan Geologi, Fakultas Teknik, Universitas Hasanuddin, Jl. Perintis Kemerdekaan Km. 10, Makassar, 90245,  Indonesia.

Mahasiswa Magister Teknik Geologi, Fakultas Teknik, Universitas Hasanuddin, Jl. Perintis Kemerdekaan Km. 10, Makassar, 90245,  Indonesia.

Abstract

The existance of paleovolcanoes closely asociated with natural resources either minerals resources, rocks and groundwater potential. Paleovolcanoe of Pangkajene identified by the presence of the lava domes, especially Bulu Seppang and Bulu Batualong located in Bua’e areas, Sidrap. This Study aims to identify the subsurface rocks Bulu Seppang and Bulu Batualong based on resistivity properties. The method used is a literature study and measurement of geoelectric resistivity Wenner configuration. Measurement of geoelectic resistivity measurement carried out on two lines. From the measurement result obtained geoelectric resistivity value of each lines from 0,094 – 118,21 Ohm.m and 1,505 – 34,07 Ohm.m. Subsurface rocks interpretation result based on resistivy profile obtained the first layer is the most under estimated in the form of sandstone and mudstone Walanae Formation members with resistivity values <5 font="" nbsp="" ohm.m="">the ignimbrite unit on second layer with resistivity values 5 – 40 Ohm.m and basal unit for third layer with resistivity values 40> Ohm.m. 

Keywords: Paleovolcanoe, Bulu Seppang, Bulu Batualong, Geoelectric resistivity

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