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《陜西池溝斑巖型銅礦床含礦巖體地球化學(xué)特征、成巖成礦時(shí)代及其意義.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、2014年8月礦床地質(zhì)第33卷第4期August,2014MINERALDEPOSITS33(4):807~820文章編號(hào):0258—7106(2014)04—0807—14陜西池溝斑巖型銅礦床含礦巖體地球化學(xué)特征、成巖成礦時(shí)代及其意義任濤,王瑞廷2,謝桂青3,李劍斌1,代軍治2,郭延輝1,黨勘峰1,武曉琴1(1西北有色地質(zhì)勘查局七一三總隊(duì),陜西商洛726000;2西北有色地質(zhì)勘查局地質(zhì)勘查院,陜西西安7100543中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所,北京100037)摘要池溝銅鉬多金屬礦床是近年來(lái)在秦嶺造山帶發(fā)現(xiàn)的~處斑巖型礦床。文章對(duì)該礦床的成礦
2、巖體進(jìn)行了巖相學(xué)、巖石地球化學(xué)分析,并測(cè)試了礦石中輝鉬礦的Re-Os年齡。結(jié)果表明:金屬硫化物呈星散浸染狀、細(xì)脈浸染狀分布于池溝石英閃長(zhǎng)巖中;池溝中酸性巖體屬于高鉀鈣堿性系列,具準(zhǔn)鋁質(zhì)一過(guò)鋁質(zhì)性質(zhì),微量元素分析結(jié)果顯示其為碰撞后花崗巖;輝鉬礦的Re-Os年齡為148Ma。池溝區(qū)內(nèi)巖體LA-ICP—MS鋯石U_Pb年齡為140~148Ma,與礦石輝鋁礦的Re-Os年齡一致,均形成于侏羅紀(jì)晚期。結(jié)合巖體產(chǎn)狀、含礦性判別分析,認(rèn)為池溝中酸性巖體的形成和礦化發(fā)生在侏羅紀(jì)一白堊紀(jì)擠壓一伸展轉(zhuǎn)變期,對(duì)應(yīng)的地球動(dòng)力學(xué)背景為華北板塊與揚(yáng)子板塊碰撞造山后的陸內(nèi)造
3、山和伸展過(guò)程。關(guān)鍵詞地質(zhì)學(xué);中酸性巖體;地球化學(xué)特征;同位素年代;成礦背景;山陽(yáng)池溝中圖分類(lèi)號(hào):P618.41文獻(xiàn)標(biāo)志碼:AGeochemistryandrock--formingandore-formingepochsofChigouCuporphyrydepositinShaanxiProvince,andtheirimplicationsRENTaO,WANGRuiTing2XIEGuiQing3,LIJianBin,DAIJunZhi,GUOYanHui,,DANGKanFengandWUXiaoQin(1No.713Geologica
4、lPartyofNorthwestGeologicalExplorationandMiningBureauforNonferrousMetals,Shangluo726000,Shaanxi,China;2NorthwestGogica1ExplorationandMiningBureauforNonferrousMetals,Xi’an710054,Shaanxi,China;3InstituteofMineralResources,CAGS,Beijing100037,China)AbstractTheChigoucopper—molybd
5、enumpolymetallicdepositisaporphyrydepositintheQinlingorogenicbelt.Theoresshowdisseminatedandfine—graineddisseminatedstructureinChigouquartzdiorite.Geochemicalanalysesshowthattheintermediate—acidintrusivebodyofChigoubelongstohigh—Kcalc—alkalineseries,withaluminum-peraluminous
6、characteristics.Traceelementsfeaturesshowthesimilaritytopost—collisiontypegranite.Thedat—ingbyLA-ICP..MSofzirconsandRe.Osofmolybdeniteindicatesthattheintermediate-acidintrusivebodyofChigouhaveagesfrom140to148Ma,whereastheageofmolybdeniteobtainedbyRe—Osmethodis148Ma.Theagesof
7、theintrusivebodyanditsmineralizationareconsistentwitheachother,suggestingthattheywerebothproducedinthelateJurassicperiod.Combiningthemodeofformationoftheintrusivebodywithitsore一本文得到“十二五”國(guó)家科技支撐計(jì)劃課題(2011BAB04B05)和公益性行業(yè)科研專(zhuān)項(xiàng)(201111007—3)項(xiàng)目聯(lián)合資助第一作者簡(jiǎn)介任濤,男,1967生,教授級(jí)高工,主要從事金屬礦產(chǎn)勘查及技術(shù)
8、管理工作。Emaih713dky@163.COITI**通訊作者王瑞廷,男,1969生,教授級(jí)高工。Email:wrtyf@163.tom收稿日期20