津巴布韦南十字矿区钨矿床地质特征及成因探讨

Study on Geological Characteristics and the Origin of Tungsten Deposit in Southern Cross Mining Area in Zimbabwe

摘要:

南十字矿区钨矿床的形成与新太古代的中酸性侵入岩、太古宙的绿岩带有密切关系；钨矿体主要受控于近EW向展布的脆—韧性构造带F1，且具有多期性和多阶段性；钨矿赋存于片麻状花岗闪长岩与布拉瓦约（Bulawayo）群近EW向展布的层间滑脱带内，受F1脆—韧性剪切构造带控制，与太古代花岗闪长岩界线为断层接触，矿体主要为含钨绢英岩化花岗闪长质碎裂岩型，其次为石英脉型；该矿床的形成主要表现为两个阶段(含3个期次)，即主成矿阶段（Ⅰ期）和弱成矿阶段（Ⅱ期、Ⅲ期）。钨元素的主要物质来源于区内的花岗闪长岩岩体和太古代布拉瓦约群地层。围岩蚀变发育，硅化、绢云母化、绿泥石化、黄铁矿化等蚀变与钨矿化关心密切。

Abstract:

The formation of tungsten deposit in Southern Cross mining area is closely related to Neoarchean intermediateacid intrusive rock and Archean greenstone. The tungsten ore body is mainly controlled by embrittlement ductile structural zone F1 with the trend of EW/ It has multistage and multistage properties. The tungsten deposit mainly occurs in the sericite diorite and quartz vein below 60m of tectonic contact surface between the gnedlike granodiorite and buwayo group. It is controlled by the F1 brittleductile shear tectonic zone and belongs to the sericite granodiorite type tungsten deposit and quartz vein type tungsten deposit. The formation of tungsten ore body are mainly divided into two stages (three times), namely the main metallogenic stage (Ⅰ period) and weak metallogenic stage (Ⅱperiod.Ⅲ period). The main materials of tungsten elements come from the granodiorite in the area, and the Archean Bulavayo group. The alteration development of surrounding rock is closely related to tungsten mineralization, such as silicification, sericite, chlorite and pyrite.