首页|Thermoluminescence dating of volcanic and altered rocks in the Bajawa geothermal area, central Flores Island, Indonesia
Thermoluminescence dating of volcanic and altered rocks in the Bajawa geothermal area, central Flores Island, Indonesia
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NSTL
Ages of volcanic and altered rocks distributed in the Bajawa geothermal area were determined by thermoluminescence (TL) dating. All volcanic rock samples are collected from formations younger than 0.15 Ma by K-Ar dating but their fixed ages have not been determined. Separated quartz and plagioclase are used for dating. Ages for eight volcanic rocks range from 32-160 ka. The youngest age of 32 ka is obtained for Mt. Keli Inerie, a large active stratovolcano. Ages of 72-160 ka are first reported for small stratovolcanos that are characterized by clear craters at the summits and linearly arranged. Most acidic white colored alteration halos have been formed at low temperatures, generating no quartz. Only Nage, Mataloko and Rakalaba alteration zones have yielded samples for TL dating using quartz. The obtained TL alteration age range are 12-54 ka, 28-33 ka and 44 ka for Nage, Mataloko and Rakalaba, respectively. Ages of volcanic rocks are expected for a heat source in most geothermal fields in the Bajawa geothermal area. Young alteration ages also suggest the existence of reservoirs beneath this area.
NSTL
