THERMOLUMINESCENCE BEHABIOR OF QUARTZ IN GRANITIC ROCKS AND EVALUATION OF GEOTHERMAL POTENTIAL

Kakkonda地热田中新世-第四纪火山岩和火山碎屑岩中石英的热释光发光曲线按升温顺序分为L(低)峰、M(中)峰和H(高)峰。热释光发射与地层边界无关，但与地表地热现象密切相关。在玉马川焊接凝灰岩喷发后，第四纪发生了自然退火引起的热释光激发过程；由于温度下降，随后开始了辐射储存过程。热释光行为反映了自然温度现象和古温度历史。与L峰和M峰相比，H峰是热稳定的，H峰相对强度小于5%的区域与流体主要为对流的表面区重合。此外，L峰和M峰指示上升流带西缘附近有较低温度的流体与热上升流混合，热释光特征反映了古地温史，与地热流体流动有关。热释光是评价地热系统中自然温度现象和地下热流的一种有效勘探技术。

The thermoluminescence glow-curve of quartz in volcanic and pyroclastic rocks of the Miocene and Quaternary in the Kakkonda geothermal field was divided into L (low), M (medium) and H (high) peaks in order of increasing temperature. Thermoluminescence emission is independent of stratigraphic boundaries but it is closely related to surface geothermal manifestations. Thermally stimulated processes of thermoluminescence caused by natural annealing occurred in the Quaternary after the eruption of the Tamagawa Welded Tuffs ; radiation storage processes then began, as a consequence of the temperature drop. Thermoluminescence behavior indicates natural temperature manifestations, together with the paleo-temperature history.The H peak was thermally stable compared to the L and M peaks, and the area within which the relative intensity of the H peak is less than 5 % coincides with the surface zone where dominant fluid flow is convective. In addition, L and M peaks indicate that a relatively low-temperature fluid mixes with the hot upflow around the western margin of the ascending flow zone.Thermoluminescence characteristics reflect paleo-temperature history and are related to geothermal fluid flow. Thermoluminescence is an effective exploration technique for evaluating natural temperature manifestations and subterranean heat flow in geothermal systems.