| 华南花岗岩型铀矿床成矿热源的分析和计算 |
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| 引用本文：.1990.The analysis and calculation of metallogenic heat source for granite-type uranium deposits in South china[J].Mineral Deposits,9(3):270~278 |
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| 中文摘要:本文在分析研究华南花岗岩型铀矿床成矿地质特征的基础上，根据JJ花岗体的规模（340km2）、放射性元素含量（U 11ppm，Th 50.2ppm，K 4.4%），及围岩导热率（Ka=
2.51×10-2Jcm-1 C-1)，计算得出JJ岩体由于放射成因的积累可在其周围形成温度为323℃（岩体中心）一167℃（距岩体3.73 km（水平）和7.871 km（垂直））的稳定热场。笔者认为，放射成因热是华南花岗岩型铀矿床的要成矿热能来源。 |
| 中文关键词:花岗岩型铀矿床 成矿热源 放射成因热 |
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| The analysis and calculation of metallogenic heat source for granite-type uranium deposits in South china |
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| Abstract:The uranium deposits related to the transformation type granites are widely distributed in South China and belong to mesothermal-epithermal type.These ore deposits derived their metallogenic substances mainly from such ore-bearing rocks as granites and sedimentary rocks, showing obvious characteristics of “using locally available materials” In view of the remarkable ore-rock time difference(32-431Ma), great dimensions of batholiths(>100km2)and high contents of radioactive element (U>10ppm), it is considered that radiogenic heat might have been a main metallogenic heat source for transformation type granite uranium deposits. Calculations on the basis of dimensions (34km2), contents of radioactive elements(U 11 ppm, Th 502 ppm, K 4.4％)and thermal conductivity of the JJ granite pluton show that the accumulation of radiogenic heat from the granite body may have produced a stable heating field around the granite body with temperature varying from 323℃ in the center to 167℃in country rocks 3.73 km from the granite body. Therefore, the radiogenic heat is thought to be a main metallogenic heat source for granite-type uranium deposits in the studied 11ranimn orefield. |
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