云南都龙矿区隐伏花岗岩地质地球化学特征与锡锌成矿作用  

Geological and Geochemical Characteristics of Later Yanshanian Concealed Granite and its Relation with Sn-Zn Polymetallic Mineralization

作　　者：苏航 韦文彪 陶志华 刀学强 李廷俊 

机构地区：[1]云南省有色地质局317队,云南曲靖655000 [2]云南华联矿产勘探有限责任公司,云南曲靖655000 [3]云南华联锌铟股份有限公司,云南文山663500

出　　处：《矿物学报》2016年第4期488-496,共9页Acta Mineralogica Sinica

基　　金：云南华联锌铟股份有限公司委托项目(编号:KY20120910)

摘　　要：云南都龙锡锌多金属矿床是继个旧和白牛厂之后我国发现的第三大锡石硫化物多金属矿床,矿区深部及外围勘探找矿对矿山的可持续发展具有极其重要意义。本文通过全岩主量、微量元素和稀土元素研究,总结了矿区隐伏花岗岩体地球化学特征,在LA-ICP-MS锆石U-Pb同位素定年基础上,确定该岩体形成于燕山晚期(117.1±0.9Ma),属于老君山花岗岩南延部分,结合前人勘探和研究成果,总结近5年金石坡矿段、曼东矿段和辣子寨矿段勘查所揭示的新地质现象,提出燕山晚期隐伏花岗岩是都龙矿区主要物质来源和能量驱动提供者,岩浆期后热液活动是该矿床形成的关键,层间剥离断层是其成矿物质的运移通道和沉淀与富集的有利场所。在此基础上,提出该矿床主体属于与燕山晚期花岗岩有关的岩浆热液夕卡岩型矿床,今后找矿应围绕深部隐伏花岗岩体开展,矿区深部及外围五口硐-燕山一带具有较好的找矿远景。Dulong Sn-Zn polymetallic ore deposit, Maguan, Yunnan Province is the 3rd largest scale cassiterite-sulfide deposit in China, and the geological prospecting of the mining area is very important for sustainable development of the company. Major elements, trace elements and rare earth elements and isotopic chronology of the concealed granite in the deep mining area were studied. Results show that the petrochemistry of concealed granite is similar to that of the Late Yanshanian 1st period Laojushan granite, and the rock mass has a LA-ICP-MS zircon U-Pb age of 117.1±0.9 Ma, implying it belonging to the southern Laojunshan granite. The new geological phenomenon has been revealed by the geological exploration in Jinshipo and Lazizhai block in the recent 5 years, showing that the Sn-Zn polymetallic mineralization is related to the Late Yanshanian concealed granite. The granite provided not only the metallogenetic materials, but also the thermal energy, and the detachment faults were the migration channel and the advantageous space of ore-forming elements. It is suggested that the Dulong deposit is a magmatic hydrothermal skarn type deposit related to the Late Yanshanian granite. The geological exploration will focus on the conceal granite in the feature, and the deep mining area and Wukoudong-Yanshan area in the southern mining area are good prospecting potential area.

关 键 词：燕山晚期隐伏花岗岩体 岩石地球化学特征 花岗岩年代学 岩浆热液夕卡岩型矿床 云南都龙锡锌多金属矿床 

分 类 号：P595[天文地球—地球化学] P618.4[天文地球—地质学]