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时间:2020-03-25
《川西丹巴地区磨子沟金矿床金、银赋存状态及成因.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、地质通报Vo1.29.NO.7第29卷第7期2010年7月GEoLoGICALBULLETINOFCHINAju1.,2010·矿产资源·川西丹巴地区磨子沟金矿床金、银赋存状态及成因肖渊甫,孙燕,熊发挥,牛刚,赵涵,赵志强XIAOYuan—fu,SUNYan,XIONGFa—hui,NIUGang,ZHAOHan,ZHAOZhi—qiang成都理工大学.四川成都610059ChengduUniversityofTechnology,Chengdu610059,Siehuan,China摘要:磨子淘金矿床位于四川省丹巴县,大地构造位
2、置位于扬子准地台西缘,松潘一甘孜造山带东缘,泥盆系危关组炭质千枚岩、板岩是主要的赋矿围岩。成矿过程分为沉积成矿期、热液成矿期和表生风化期,其中热液期是金的主要成矿期。通过显微镜观察,扫描电镜、电子探针成分分析,矿物晶体化学式计算等手段和方法,研究了矿床中Au、Ag的赋存状态和主要载金矿物的特征。金以裂隙金、包裹体金、粒间金为主,银主要以类质同像赋存于方铅矿和硫盐矿物中。载金矿物黄铁矿生物结构发育,表明生物成矿作用是金矿床形成过程中的重要作用。矿体受特定层位和断裂的控制,围岩蚀变强烈。根据矿床产出的大地构造环境、赋矿围岩特征、构造控
3、矿、层位控矿、矿物共生特点等分析结果,丹巴磨子沟金矿床为沉积一热液改造型金矿床。关键词:四川丹巴地区:磨子沟金矿床;赋存状态;成因中图分类号:P618.51;P618.52文献标志码:A文章编号:1671-2552(2010)07-1031-08XiaoYF,SunY,XiongFH,NiuG,ZhaoH,ZhaoZQ.GoldandsilveroccurrenceanditsgenesisintheMozigougoldde-posit,Danbaarea,westernSiehuan,China.GeologicalBulle
4、tinofChina,2010,29(7):1031—1038Abstract:MozigougolddepositislocatedinthemarginoftheYangtzeandeastofSongpan—Ganziorogenicbelt,DanbaCounty,SichuanProvince.withDevonianWeiguanFormationCarbonaceousslateasitsore—bearingcount1~rocks.Mineralizationcanbedi—videdintosedimentar
5、ymineralization,hydrothermalore—formingperiodandhypergeneweatheringperiod.Andthehydrothermalore—formingisthemainperiodofgoldmineralization.Theauthorsstudiedthedepositionofgold,silveroccurrencestatus,andthemaincharacteristicsofgold—bearingmineralsbymeansofmicroscopicob
6、servation,scanningelectronmicroscopy,electronprobecomposi-tionanalysis,andmineralcrystalchemicalformulacalculation.ThuswefoundOUtgoldwasmainlyinclusion,fractureandintergranulargold.S~verismainformofisomorphicoccurinGalenaandSulphosalts.Gold—bearingminer,spyritehadbiol
7、ogicalstructures,whichindicatedthatbio—mineralizationplayedanimportantroleduringtheformationstageofgolddeposits.Oresarecon~oHedbyspecificstrataandfractures,andhaveenduredstrongwall—rockalteration.Accordingtothedepositcharacteristicsoftectonicenvironment,ore—rock,struc
8、turalcontrol,layerpositioncontrolandmineralparagenesisetc.,authorscanascertaintheMozigougolddepositcanberegardedasmicro—diss
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