THE CHRONOLOGY OF THE VOLCANO SURONDING THE ULUBELU GEOTHERMAL SYSTEM
Prosiding Pertemuan Ilmiah Tahunan Asosiasi Panasbumi Indonesia XI 2011
Hotel Novotel Bandar Lampung, 12-14 Desember 2011
ISBN 978-602-7509-20-7
The Ulubelu geothermal system surrounding by ring of volcano such as Mts. Sulah, Kukusan, Duduk, Kabawok, Tanggamus, Rendingan and Kurupan. Mts. Sulah, Kukusan (3,9 Ma) and Duduk (3,9 Ma) consist of the Pliocene andesitic, basaltic and dacitic volcanoes respectively. These are located in the middle of the study area but their products extend to the west and northwest. Mt. Rendingan pyroclastics within a graben. The Mt. Kukusan lavas are possibly underlain by the Mt. Sulah lavas, aged about 4.5 Ma. Mt. Duduk (3,9 Ma) is a volcano that rises in the center of the Ulubelu caldera. It may be a resurgent dome that was covered by the Rendingan pyroclastics. Mts. Kabawok (1,7 Ma), Tanggamus (1,5 Ma), Rendingan (1,4 Ma) and Kurupan (1,4 Ma) are Pleistocene volcanoes. These occur within the southeast, east, north and northeast parts of the study area respectively. The Mt. Kabawok pyroclastics extend from its summit north and west and partly overlie the Mt. Kukusan lavas. The Mts. Tanggamus laharic breccia and andesite lavas occur in the upper and southeast parts of the area. The Mt. Rendingan pyroclastics and andesite lavas, in the north and northwest, overlie the Mts. Sulah, Kukusan and Duduk lavas that derive from northwest of the central area. The Dacite Tuffs overlie the Mt. Rendingan pyroclastics, the Mt. Kabawok pyroclastics and the Mt. Tanggamus lahars in the north and east sections, but are overlain by the Mt. Kurupan rhyolite lavas close to the Mt. Kurupan summit in the northeastern area.
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