PENENTUAN UMUR ABSOLUT BATUAN KUBAH LAVA ANDESIT DAERAH PANAS BUMI LEJJA-KABUPATEN SOPPENG, PROVINSI SULAWESI SELATAN MENGGUNAKAN METODE THERMOLUMINESCENCE (TL)

DETERMINATION OF ABSOLUTE AGE LAVA DOME ANDESITE ROCK AT GEOTHERMAL LEJJA AREA, SOPPENG DISTRICT, SOUTH SULAWESI PROVINCE BY THERMOLUMINESCENCE (TL) METHOD

  • Dikdik Risdianto Pusat Sumber Daya Mineral Batubara dan Panas Bumi
  • Sukaesih Sukaesih Pusat Sumber Daya Mineral Batubara dan Panas Bumi
  • Nizar Muhamad Nurdin Pusat Sumber Daya Mineral Batubara dan Panas Bumi
  • Stephen Situmorang Universitas Padjadjaran
  • Agus Didit Haryanto Universitas Padjadajaran
Keywords: Thermoluminescence, TL, geological dating, thermal history, geothermal

Abstract

Thermoluminescence (TL) has now been applied as a dating method for rock age. In geothermal exploration information about the age of rocks / volcanic material is very important to reconstruct the geological history related to thermal activity. Determination of the estimated age of rocks as a source of heat in the Lejja Geothermal prospect in Soppeng Regency, South Sulawesi Province used the TL method. The measurement procedure used with additive doses on quartz crystal grains. Measurement of dose by irradiation is done twice, at doses of 10 Gray (Gy) and 30 Gy while for annual dose is determined by analyzing the concentration of Uranium, Thorium, and Potassium using the X-ray fluorescence of method XRF.Two trend line is made to determine both minimum and maximum linear equation. Natural TL intensity shows 14380 arbitrary unit (a.u) and 14430 a.u as the minimum and maximum peak. Irradiated sample with 10 Gy dose shows peak at 1883–1947 a.u, and 30 Gy dose shows peak at 2733-2763 a.u. Regression trend line made by artificial dose show that natural TL intensity equivalent with 304.05-315.96 Gy. Calculation of uranium, thorium, potassium, water content, and beta factor produce annual dose in the amount of 0.5408 Gy. Through TL method, it is known that the absolute age of heat source at soppeng is 573 ± 11 kilo age years old.

Downloads

Download data is not yet available.

References

Aitken, M.J., 1985. Thermoluminescence Dating. Academic Press, New York, h. 359

Daniels , F., Boyd, C. A. and Saunders, D. F. (1953), “Thermoluminescence as a Research Tool”, Department of Chemistry, University of Wisconsin, Madison.

Furetta, C., 2010. Handbook of Thermoluminescence, 2nd Edition, World Scientific Publishing Co. Pte. Ltd. Singapore.

JICA (2016), “Thermoluminescence Dating of Quartz in Rocks”, Internal Manual Book.

McCalpin, J. and Forman, S. L. (1991), “Late Quaternary Faulting and Thermoluminescence Dating of the East Cache Fault zone, North-Central Utah”, Bulletin of the Seismological Society of America, vol 81, no 1, pp. 139-161.

Mejdahl, V., (1979), “Thermoluminescence Dating: Beta-Dose Attenuation in Quartz Grains”, Archaeometry 21, page 61-72, Great Britain.

Nurdin, N., Kusnadi, D., Taqodama, I., 2018. Survei Rinci Panas Bumi dengan Metode Geologi, Geokimia, dan Geofisika Daerah Lejja, Kabupaten Soppeng, Provinsi Sulawesi Selatan. Pusat Sumber Daya Mineral Batuara dan Panas Bumi Badan Geologi Kementerian Energi dan Sumber Daya Mineral. Bandung.

Preusser, F., Daniel, R., Guido, S. (2011), “Direct dating of Quaternary phreatic maar eruptions by luminescence methods”, GSA Data Repository 2011337.

Rufer, D (2012), “Proposing New Approaches for Dating Young Volcanic Eruptions by Luminescence Methods”, Geochrmonometria 39, page 48-56.

Schmidt, C., Tchouankoue, J.P., Nkouamen Nemzoue, P.N., 2017. New thermoluminescence age estimates for the Nyos maar eruption (Cameroon Volcanic Line. PLoS ONE, 12(5), e0178545.

Stelling, P., L. Shevenell, N., Hinz., Coolbaugh , G. Melosh, W. Cumming, 2016. Geothermal systems in volcanic arcs: Volcanic characteristics and surface manifestations as indicators of geothermal potential and favorability worldwide. Journal of Volcanology and Geothermal Research, 324, h. 57-72.

Takashima, I., A.A., Nazri, L.P Siong, T Koseki, Y Mouri, A., Nasution, 2005. Precise Thermoluminescence Dating for Heat Source Volcanic Rocks and Alteration Products at the Tawau Geothermal Area, Sabah, Malaysia. Proceedings World Geothermal Congress, Antalya.

Tsuchiya, N., 2000. Thermoluminescence as a new research tool for the evaluation of geothermal activity of the Kakkonda geothermal system, northeast Japan. Geothermic, 29, h. 27-50.

Yincan, Y., 2017. Active Faults of Sea Area, Marine Geo-Harzards in China, Elsevier, Amsterdam h. 89–128.

Published
2020-05-28
Section
Buletin Sumber Daya Geologi