摘要
木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花岗岩体的规模(340km^3)、放射性元素含量(U 11ppm, Th 50.2ppm,K 4.4％)及围岩导热率(K_m=2.51×10^(-2)Jcm^(-1)℃^(-1)),计算得出JJ岩体由于放射成因热的积累可在其周围形成温度为323℃(岩体中心)—167℃(距岩体3.73km(水平)和7.87km(垂直))的稳定热场。笆者认为,放射成因热是华南花岗岩型铀矿床的主要成矿热能来源。
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 (>100km^2) and high contents of radioactive elements(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 (34km^2), contents of radioactive elements(U 11ppm, Th 502ppm, K 4.4%) and thermal conductivity (K_m=2.51×10^(-2)Jcm^(-1)℃^(-1)) 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 JJ granite body with temperature warying 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 uranium orefield.
出处
《矿床地质》
CAS
CSCD
北大核心
1990年第3期270-278,共9页
Mineral Deposits
