摘要
找寻与隐伏花岗岩伴生的矿床是栗木矿区深边部及外围找矿的目标和难点。前人找矿勘查主要集中在侵位较浅的第三阶段花岗岩,对侵位较深的第二阶段花岗岩的认识则局限于其上部脉状矿体,制约了进一步的找矿突破。针对花岗岩型矿床地质特征,重新总结了栗木矿田含矿花岗岩垂向分带特征,垂向分带包括岩体内带和岩体外带,内含3个成因类型和5个工业矿床类型;研究揭示了构造活动对岩体垂向分带及成矿作用的影响,主要表现在第二阶段花岗岩体侵位于较深的部位时,往往形成多层矿,其岩体外带岩脉及脉型矿多位于主岩体较远的上部,而第三阶段花岗岩侵位于较浅的部位,其岩体外带岩脉及脉型矿多位于主岩体较近的上部甚至与花岗岩相连。依据花岗岩垂向分带特征,找矿勘查首次在第二阶段花岗岩中发现了蚀变花岗岩型钨锡矿床,鱼菜、三个黄牛2个矿床初步规模分别达到了中型、小型,并对其外带脉型矿取得了新认识;在外围数个区段新发现了数条具有工业意义的钨锡矿脉,取得了找矿成果突破。基于对花岗岩体成岩成矿垂向分带的研究,认为栗木矿田仍有较大找矿潜力,并圈定出2个找矿靶区,即老矿区深边部隐伏岩体形态上的岩沟凹陷内相对突起部位以及水溪庙东南,西部香粉厂、黄桶界—沟挂垒等区段深部。
earching for the deposit associated with concealed granite is the goal and difficulty of prospecting in thedeep and periphery of Limu mining area. Previous prospecting and exploration mainly focused on the third stage granite withshallow emplacement,while the understanding of the second stage granite with deep emplacement is limited to its upper veintype orebody,which restricts further prospecting breakthrough.According to geological characteristics of granite type depos-its,the characteristics of vertical zoning are resummarized in the ore-bearing granite in Limu Orefield.The vertical zoning in-cludes the inner zone and outer zone of granite body,and contains three genetic types and five industrial deposit types.Thispaper reveals the influence of tectonic activity on the vertical zoning and mineralization of Limu granite.When the secondstage of granite intrudes into the deeper part,deposits are often composed of multi-layer ore bodies and dikes or vein orebod-ies are mostly located in the far upper part of granites.However,when the third stage of granite intrudes into the superficialpart,dikes or vein orebodies are mostly located in the proximal upper part of granite and even connected with granites.Accord-ing to vertical zoning in the Limu granite,the altered granite type W-Sn deposits are discovered in the second stage granite forthe first time,such as Yucai Deposit and Sangehuangniu Deposit.The scale of Yucai Deposit is medium-sized and Sangehu-angniu Deposit is small-sized,in addition,new understanding of vein type deposits in the outer zone of granite is obtained.Itis a breakthrough in prospecting that Sn-W veins with industrial significance are discovered in the periphery of Limu miningarea.The above practice shows that Limu Orefield still has great potential and two prospecting targets for the next step are proposed.One is relative protrusion of low-lying places within shape of concealed granites in deep edge of old mining area,in ad-dition,southeast of Shuiximiao,the other is the deep of the sections of Xiangfenchang,Huangtongjie-Gougualei in the west ofmining area.
作者
董业才
梁磊
徐文杰
张国林
DONG Yecai;LIANG Lei;XU Wenjie;ZHANG Guolin(China Nonferrons Metals(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,China)
出处
《金属矿山》
CAS
北大核心
2021年第9期143-151,共9页
Metal Mine
基金
国土资源部“全国危机矿山接替资源勘查”项目(编号:200645091)
广西大规模地质矿产勘查项目(编号:[2010]604)
广西找矿突破战略行动项目(编号:201902270146)
中国有色集团科技计划项目(编号:2018KJJH07)
广西有色金属集团有限公司科研项目(编号:GYDK090002,GYDK090018)。
关键词
深部找矿
隐伏花岗岩体
垂向分带
找矿预测
找矿靶区
找矿突破
deep prospecting
concealed granite
vertical zoning
prospecting prediction
prospecting target area
prospecting breakthrough
