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The heat source mechanism is vital to the activity of high-temperature geothermal field. This paper analyses the intrusion era, scale and temperature of magma chamber and the radiation heat of basal granite in Ruidian geothermal field, a typical constrained heat source dominated by magma chamber in southwestern China. The analysis results show that: an intrusive high-temperature magma chamber was formed in Late Pleistocene in Gudong-Mazhan Belt, southern Yunnan Province; the magma chamber was an approximate ellipsoid with a 19km-long east-west axis, a 25km-long north-south axis, a 15km-height, and a highest temperature of 700°C. The basement of this geothermal field is biotite adamellite rich in radioactive elements (e.g. 238U, 232Th and 40K). The mean decay heat generation rate stands at 6.90µW/m3 and the estimated temperature is 116~120°C at the depth of 2km. In addition, the said magma chamber is the main heat source, whose radiogenic heat contributes to the temperature distribution of Ruidian high-temperature geothermal field. In this way, the author discovered the formation mechanism of Ruidian high temperature geothermal field, laying a solid basis for further research on heat source mechanism of geothermal fields
geothermal field, heat source, magma chamber, granite radioactivity, ruidian, China
This work was supported by the National Natural Science Foundation of China (No. 41502342) and the Geological survey project of China (No. DD20160303)
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