澳大利亚汤斯维尔地区铀矿成矿规律和勘查方向研究

Metallogenetic Pattern and Prospecting Orientation in Townsville Area,Australia

澳大利亚汤斯维尔西南部地区的伯德盆地,在中晚石炭世受北东向和南西向的挤压作用,形成了不对称的开放式盆地,致使盆地西部和东部分别发育了北东向与北西向的线性构造,此构造在很大程度上控制了区内的火山岩和地质边界;形成于泥盆纪和石炭纪的火山岩,为该区铀的主要赋矿岩系;发育于该区地堑两翼深大正断层的岩浆源,与铀的富集具有直接关系;该区的铀矿类型为火山岩型铀矿和铀钼矿床,主要产于火山口-火山颈相中,矿体形态多样,并受构造控制。航放与航磁资料显示该区的中西部和西北部为找矿的重点区域。

In the Reid River area, to the southwest of Townsville, Australia, was subjected to NE-SW compression during the middle to late Carboniferous, and formed an asymmetric open basin. Thus resulted in the development of NE and NW linear structures in the area＇s west part and east part respectively, and controlled volcanic rocks and geological boundaries in the area to a great extent. Volcanic rocks formed in Devonian and Carboniferous periods are the main uranium--bearing rock series. The magma sources from discordogenic faults of both graben sides have direct relation with uranium enrichment. The uranium ore in the area has volcanic and sedovitic two types, mainly formed in crater and neck facies, orebody has multiple configurations and controlled by structures. Aero- radiometric and aeromagnetic data have demonstrated that the midwest and northwest of the area is the key area for prospecting.