广西西大明山弄屯铅锌矿床断裂构造解析

发布时间：2019-01-05 00:13

【摘要】：弄屯矿床是西大明山地区新发现的规模最大的铅锌矿床,是受断裂控制的典型热液脉型矿床。文章在充分搜集已有勘查资料的基础上,认为铅锌矿体主要受NE向和(近)EW向断裂控制,矿体主要产在断裂浅部产状较缓的部位,向深部断裂产状变陡,矿体厚度减薄直至尖灭;而且主矿体沿NE向断裂具有向SW侧伏的趋势。在此基础上,利用控矿断裂的擦痕、阶步以及伴生的节理、牵引褶皱等小构造,对控矿断裂的运动学和动力学特征进行了解析,分析认为控矿断裂在成矿期表现为逆断层活动特征,是受近SN向主压应力作用下形成的。利用SPSS、Surfer软件对矿体的产状、有用组分含量等数据进行统计分析并绘制了等值线图,研究得出成矿热液是先由F1断裂进入NE向断裂中,随后沿NE向断裂由西南向北东运移,并最终导致Zn、Pb先后沉淀富集形成厚大的矿体。根据已有的同位素数据和构造解析资料,可基本确定弄屯铅锌矿床形成于燕山晚期。
[Abstract]:Nongtun deposit is the largest newly discovered Pb-Zn deposit in the West Daming Mountain area and is a typical hydrothermal vein type deposit controlled by faults. On the basis of fully collecting the existing exploration data, it is considered that the lead-zinc orebody is mainly controlled by the NE and (near) EW trending faults, and the orebody mainly occurs in the parts of the shallow part of the fault where the occurrence of the fault is relatively slow, and the occurrence of the orebody toward the deep fault becomes steeper. The thickness of ore body is thinned until the end of the ore body; Moreover, the main orebody has the tendency of lying in the SW side along the NE direction fault. On this basis, the kinematic and dynamic characteristics of the ore-controlling fault are analyzed by using the small structures such as scratches, steps and associated joints of ore-controlling faults, traction folds, etc. It is considered that the ore-controlling fault was formed under the action of the near SN principal compressive stress during the metallogenic period. The occurrence and useful component contents of ore bodies are statistically analyzed by using SPSS,Surfer software, and the isoline maps are drawn. The results show that the ore-forming hydrothermal fluid first moves from F1 fault to NE fault, and then moves from southwest to north to east along NE fault. Finally, Zn,Pb was precipitated and enriched successively to form a thick ore body. Based on the available isotopic data and tectonic analytical data, it can be determined that the Nongtun Pb-Zn deposit was formed in the late Yanshanian period.
【作者单位】：桂林理工大学地球科学学院;桂林理工大学广西隐伏金属矿产勘查重点实验室;玉林市建筑设计院;广西地质矿产勘查局第四地质队;
【基金】：广西自然科学基金(编号:2016GXNSFBA380067;2015GXNSFDA139029) 2013年广西大规模地质矿产勘查项目(编号:桂财预函[2013]116号) 桂林理工大学人才引进科研启动基金项目(编号:002401003374)联合资助
【分类号】：P618.4

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