Suharno, Suharno (2015) Analysis of Thermal Manifestation in Suoh West Lampung Indonesia. Proceedings World Geothermal Congress 2015 Melbourne, Australia, 19-25 Ap.

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Abstract

Suoh Geothermal Field is located in a pull-apart basin resulting from a step in the Great Sumatra Fault (GSF) which strikes NW. This Field is found within a valley which widens into a broad depression (the Suoh depression) and near the southern end of the Sumatra fault zone. Significant thermal features are located near the western and eastern margins of the depression. The Suoh depression is interpreted to have formed as a result of a fault jog, where the Great Sumatran Fault zone is offset dextrally by a pair of north-south faults. The dominant units are young alluvium (Qal) and Asam eruption deposits (Qae). South-west of the Souh depression the primary rock type is Tertiary Andesite (Tat). North-east of the depression are the Tekorberak Volcanics (Qsdt). The youngest volcanics in the area are the Loreng Volcanics (Qlr) located immediately west of the Kalibata thermal area. Thermal areas in Suoh consist of the Kalibata, Way Haru and Srirejo areas. Geochemistry interpretation was based on the Na-K-Mg and Cl-SO4- HCO3 ternary plots. Liquid geothermometry strongly suggest the Kalibata thermal features are connected to a benign geothermal system with temperatures of 250°C to 260°C. Estimated temperatures at Way Haru and Srirejo are lower, at 210 °C and 175 °C, respectively. The hottest fluids in the system upflow along the deep-seated Great Sumatra Fault and the western graben transform fault, heated by magmas associated with the Loreng Volcanics. These fluids flow out into the basin-filling volcanics and sediments and likely the underlying Tertiary volcanics to form the geothermal reservoir.

Item Type:	Article
Subjects:	T Technology > TN Mining engineering. Metallurgy
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User:	SUHARNO
Date Deposited:	05 Mar 2021 08:47
Last Modified:	05 Mar 2021 08:47
URI:	http://repository.lppm.unila.ac.id/id/eprint/28199

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