广东云浮金子窝锡多金属矿床控矿条件与矿化分布规律

ORE CONTROLLING CONDITIONS AND MINERALIZATION DISTRIBUTION OF JINZIWO TIN POLY-METALLIC DEPOSIT IN YUNFU,GUANGDONG PROVINCE,SOUTHERN CHINA

云浮金子窝锡多金属矿床位于广东四会-吴川构造带与肇庆-海丰纬向构造交汇部位。主要控矿条件包括基底地层、岩浆岩、构造等。主断裂派生的次一级断裂交切部位控制了矿床的定位和空间展布。寒武纪地层的W、Sn等元素含量较高,是重要的矿源层。后期的热事件使成矿元素发生重新分布。混合岩化和花岗岩化作用,使锡等成矿元素在矿液中逐渐富集,并在压力驱使下沿构造裂隙上升,在围岩中有利地段充填交代形成矿床。矿床存在垂直方向变化。根据矿体在空间上的原始展布和变化规律,对矿区边部和深部之隐伏矿体进行了预测。

Jinziwo tin poly-metallic deposit in Yunfu is located in the intersection of Sihui-Wuchuan fracture and Zhaoqing -Haifeng latitudinal fracture. The main ore-controlling conditions are the basement strata, magma and structure etc. The intersection of sub-fractures derived from the main faults controlled the location and spatial distribution of the deposits. Precambrian strata which are rich in ore-forming elements such as W and Sn are resource layer of the tin poly-metallic deposit and the geothermal incidents afterwards made these elements redistribute. With the migmatization and granitization, the ore-forming elements in the solution accumulated gradually at the top of the intrusion ,moved upward along the fracture and deposited as ore-deposits in the favourable countryrocks by the process of filling and replacement. The mineralization region can be sketched out according to the spatial distribution regularities of the orebodies so the hidden deposits could be found in the outside and deep part of the ore field.