广西乐业林旺金矿床地质特征及控矿因素分析  

Geological Characteristics and Ore-Controlling Factors of Linwang Gold Deposit

作　　者：刘苏桥[1] 陈懋弘[2] 黄庆文[3] 张长明 李继贤 蒋柏昌[6] 

机构地区：[1]桂林理工大学广西地质工程中心重点实验室,广西桂林541004 [2]中国地质科学院矿产资源研究所,北京100037 [3]中国地质大学(北京),北京100083 [4]山东金软科技有限公司,山东招远265400 [5]广西271地质队,广西桂林541100 [6]广西区域地质调查研究院,广西桂林541003

出　　处：《桂林理工大学学报》2010年第2期188-194,共7页Journal of Guilin University of Technology

基　　金：广西地质工程中心重点实验室开放基金项目(桂科能07109011-K026);国土资源部公益性行业科研专项经费项目(200911007-28);国家重点基础研究发展计划项目(2007CB411407)

摘　　要：广西乐业林旺金矿是滇黔桂＂金三角＂近年新发现的中型矿床之一,具有层控和断控的双重特点。矿床位于同生断裂附近褶皱和断裂构造最为发育的地方,含矿地层为槽盆相中三叠统百逢组,赋矿围岩为含钙质砂岩。原生矿石具典型的浸染状构造,主要载金矿物为含砷黄铁矿,次为毒砂。蚀变类型为硅化、黄铁矿化、毒砂化、辉锑矿化、碳酸盐化、粘土化等。金主要以＂不可见＂的纳米级超显微包裹金形式存在于含砷黄铁矿环带中。成矿流体具有中低温（178-230℃）、低盐度（w（NaCl）5%-7%）、中低密度（0.79-0.94 g/cm^3）的特点。这些特征表明林旺金矿属于卡林型金矿。地层、褶皱和断裂是矿区最主要的控矿因素,三者的有机组合控制了矿体形态和产出部位。Linwang gold deposit,located in Leye of Guangxi,is a newly-discovered middle-scale Carlin-type gold deposit in Yunnan-Guizhou-Guangxi triangle area in southwestern China,with dual characteristics of stratabound and fault-controlled orebodies.The deposit developed in the intensive folding and faulting positions near the contemporaneous growth fault.The main ore-bearing unit is Baifeng Formation of middle Triassic.Ore-hosting wallrocks are calcareous arenites and siltstones.Disseminated structure is typical in primary ores.Main gold-bearing minerals are arsenian pyrites and arsenopyrites.Major mineralization and alteration types are silicification,pyritization,arsenopyritization,stibnit ization,carbonatization and argillation.Submicroscopic-microscopic gold is within the outer rim of arsenian pyrites and arsenopyrites.The ore-forming fluid is moderate temperature（178-230 ℃）,low salinity（w（NaCl）5%-7%）and low density（0.79-0.94 g/cm^3）.All these characteristics show that Linwang deposit can be classified to Carlin-type gold deposit.Stratum,fold and fault are the principal ore-controlling factors,and control the shape and location of orebodies..

关 键 词：地质特征 控矿因素 卡林型金矿 林旺金矿 广西 

分 类 号：P618.51[天文地球—矿床学]