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1、陜西省潼關(guān)縣桐峪-西峪金礦礦床地質(zhì)特征及成因探討陜西省潼關(guān)縣桐峪-西峪金礦礦床地質(zhì)特征及成因探討摘要陜西省桐峪-西峪金礦位于小秦嶺金礦田西峪西闖溝—東闖溝近溝腦一帶。區(qū)域構(gòu)造較為復雜，以近東西向褶皺和礦區(qū)南北兩條走向東西的區(qū)域性斷裂組成該區(qū)構(gòu)造骨架，巖漿巖分布廣泛，巖漿活動頻繁，呈較大的花崗巖基出露，侵入巖不發(fā)育，變質(zhì)作用主要為區(qū)域變質(zhì)作用，巖石普遍遭受混合巖化。本文在充分收集前人研究資料的基礎(chǔ)上,通過野外調(diào)研、巖礦綜合鑒定、槽探、硐探、取樣及測試分析等方法和手段，并結(jié)合東桐峪-西峪地區(qū)金礦的區(qū)域成礦地質(zhì)背景詳細研究了該礦床的地質(zhì)特
2、征、礦區(qū)巖漿巖分布及特征、變質(zhì)巖主要特征，進而探討了礦床的成因問題。太華群為金的初始礦源層，在區(qū)域變質(zhì)和混合巖化過程中，地層中的金組分部分被活化遷移，形成含金變質(zhì)熱液；后來的擠壓變形產(chǎn)生不同性質(zhì)的斷裂，導致含礦變質(zhì)熱液向低壓區(qū)遷移，在適宜的物理化學條件下沉淀形成初始含金石英脈；燕山期的大規(guī)模巖漿活動，使初始礦脈再受擠壓、破碎；在巖漿演化過程中，析出的堿質(zhì)流體，可使沿途太華群中的礦質(zhì)再活化遷移，并對礦脈中早期成礦物質(zhì)再溶解，充填到原始礦脈中起了迭加富集作用，得出桐峪-西峪金礦床屬于變質(zhì)熱液—巖漿疊加改造型。關(guān)鍵詞陜西??；桐峪—西峪金礦
3、；地質(zhì)特征；變質(zhì)熱液—巖漿疊加改造型金礦床Abstract:Tongyu-XiyugolddepositinShanxiprovinceislocatedinWestValleyWestchuangditchtoDongchuangditchareaintheQinlingMountainsgoldore長春工程學院學士學位論文陜西省潼關(guān)縣桐峪-西峪金礦礦床地質(zhì)特征及成因探討field.Regionalstructureiscomplex,neareast-westtrendingfoldandtwoeast-westregiona
4、lfaultsformtheregionaltectonicframework,Magmatitedistributeswidely,magmaticactivitiesfrequent,alargegranitebatholithexposed,intrusiverockisnotdeveloped,metamorphismismainlyregionalmetamorphism,rocksgenerallysuffermigmatization,theformationofmigmatizationinanticlinalaxi
5、sisstrongerthanthetwowings,inspaceeasternareaisstrongerthanwesternarea.BecauseoftheArcheanTaihuaGroupcomposedofDayue-Jinluospotsacrosstheanticline,Anticlinewingscanbeseeninsecondaryfoldsconsistentwithregionaltectonicline,RegionalfaultispiedmontfaultandXunmadaofault,are
6、neareast-westmixedmodefracture,hasgenerationearly,multiperiodactivitiescharacteristics,providegoodgeologicalconditionsfortheregionalmetallogenic.Inthispaper,basedonthewellcollectiononpreviousstudies,throughfieldinvestigation,rockandmineralcomprehensiveidentification,tr
7、enching,aditexploration,samplingandtestinganalysismethodsandmeans,combinedwithregionalgeologicalbackgroundofTongyu-xiyugolddeposit,detailedstudythegeologicalcharacteristics,magmatitedistributionandcharacteristicsofmetamorphicrocks,themaincharacteristicsofmetamorphicroc
8、ks,andthendiscussesthegenesisofdeposit.Thelaterdeformationleadstodifferentfracture,orebearingmetamorphichydrothermalf
