安徽池州许桥银矿地质特征及矿区深部找矿方向
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摘要
许桥银矿床位于长江中下游成矿带安庆-贵池矿集区东南部,矿床银储量达到中型规模,成矿岩体为分水岭石英闪长岩,矿体主要呈似层状赋存于分水岭岩体北东侧奥陶系仑山组、汤山组地层层间裂隙中;矿石矿物主要为黄铁矿、闪锌矿、方铅矿、黝铜矿、黄铜矿、辉银矿、自然银,脉石矿物为石英、碳酸盐矿物;矿石组构以自形-他形晶结构、交代结构、稀疏浸染状构造和网脉状构造为主;围岩蚀变类型主要有硅化、碳酸盐化、矽卡岩化、绿泥石化等;许桥银矿床成矿作用经历了两个成矿期:热液期和表生期,热液期又可分为三个成矿阶段,即为矽卡岩阶段、石英-硫化物阶段及碳酸盐-硫化物阶段;成矿流体早期以岩浆热液为主、晚期混有大气降水的流体演化特征;成矿物质主要来源于岩浆热液,地层贡献了部分矿质;成矿温度为中低温(208～259℃),矿床类型为中低温热液银多金属矿床,并指明了矿区深部找矿方向。
The Xuqiao silver ore deposit is situated in the southeastern part of the Anqing- Guichi mining camp in the mid-lower Yangtze River reaches metallogenetic belt,with silver reserve up to a medium size,mineralization being hosted in watershed quartz diorite,mainly stratoid ore body occurring in the interlayer fractures of the Ordovician Lunshan Formation and Tangshan Formation.Ore minerals include pyrite,sphalerite,galena,tetrahedrite,chalcopyrite,argentite,natural silver;gangue minerals are quartz and carbonate minerals;ore fabrics are substantially euhedral-anhedral,metasomatic,sparsely disseminated and stockworked;wall rock alteration is dominated by silication,carbonatation,skarnization and chloritization.The deposit has two mineralization epochs: hydrothermal epoch and supergene epoch,and the former is further divided into three stages,i.e.,skarn stage,quartz-sulfide stage and carbonate-sulfide stage;ore-forming fluid is predominantly magmatic hydrothermal fluid in the early period,and joined by precipitation later.Ore-forming material is mainly derived from magmatic hydrothermal fluid,with some contribution from strata.Ore formed at midlow temperature(208～259℃)leading to a mid-low hydrothermal silver polymetallic deposit and giving clues for deepseated ore prospecting in the ore district.
The Xuqiao silver ore deposit is situated in the southeastern part of the Anqing- Guichi mining camp in the mid-lower Yangtze River reaches metallogenetic belt,with silver reserve up to a medium size,mineralization being hosted in watershed quartz diorite,mainly stratoid ore body occurring in the interlayer fractures of the Ordovician Lunshan Formation and Tangshan Formation.Ore minerals include pyrite,sphalerite,galena,tetrahedrite,chalcopyrite,argentite,natural silver;gangue minerals are quartz and carbonate minerals;ore fabrics are substantially euhedral-anhedral,metasomatic,sparsely disseminated and stockworked;wall rock alteration is dominated by silication,carbonatation,skarnization and chloritization.The deposit has two mineralization epochs: hydrothermal epoch and supergene epoch,and the former is further divided into three stages,i.e.,skarn stage,quartz-sulfide stage and carbonate-sulfide stage;ore-forming fluid is predominantly magmatic hydrothermal fluid in the early period,and joined by precipitation later.Ore-forming material is mainly derived from magmatic hydrothermal fluid,with some contribution from strata.Ore formed at midlow temperature(208～259℃)leading to a mid-low hydrothermal silver polymetallic deposit and giving clues for deepseated ore prospecting in the ore district.
引文
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[2]周余谔.安徽铜山铜矿床有关地质体中稀土元素特征及其地质意义[J].安徽地质,1997,7(2):51～58.
[3]俞沧海.贵池铜山铜矿床成因探讨[J].地质与勘探,2001,37(2):12～16.
[4]左胜平.安徽贵池铜山铜矿控矿因素及找矿建议[J].安徽地质,2001,11(1):35～53.
[5]王勇.铜山铜矿F1断裂带构造控矿特征分析[J].矿产与地质,2003,17(4):530～532
[6]董胜.安徽省贵池地区区域地球化学特征及找矿意义[J].物探与化探,2006,30(3):215～223.
[7]孙亚力,张立明,张洪洲,刘青.安徽池州铜山铜矿深部找矿实践与启示[J].云南地质,2008,27(1):40～45.
[8]谢桂青,屈文俊,侯可军,袁顺达,程言博,向君峰,杨宗喜.安徽铜山铜钼矿床的地质特征和辉钼矿Re-Os同位素年龄[J].矿物学报,2009,(增刊):32～33.
[9]宋国学,秦克章,李光明.长江中下游池州地区矽卡岩-斑岩型W-Mo矿床流体包裹体与H、O、S同位素研究[J].岩石学报,2010,(9).
[10]张智宇,杜杨松,张静,庞振山.安徽贵池铜山岩体SHRIMP锆石U-Pb年代学与岩石地球化学特征研究[J].地质论评,2011.57(3):366～378.
[11]张智宇,杜杨松,张静,庞振山,李大鹏,贾鹏飞.安徽贵池铜山矽卡岩型铜矿床蚀变矿化分带特征及其成因[J].矿床地质,2010,(6).
[12]Li H,Ling MX,Li CY,Zhang H,Ding X,Yang XY,Fan WM,Li YL and Sun WD.A-type granite belts of two chemical sub groups in central eastern China:Indication of ridge subduction[J].Lithos,2012,105:26～36.
[13]刘园园,马昌前,吕昭英,黄卫平.长江中下游贵池矿集区燕山期岩浆作用及其地质意义:年代学、地球化学及Sr-Na-Hf同位素证据[J].岩石学报,2012,28(10):3287～3305.
[14]万欣.安徽省许桥银矿床地质地球化学特征及成因[J].安徽地质,1996,(2).
[15]Shimazaki H.Characterist ics of skarn depos it and related acid magmatism in Japan[J].Econ.Geol.,1980,75:173～183.
[16]Shimazaki H and Yamamoto M.Sulfur isot operatios of the A katani,Iide and Waga Sennin skarn deposits,and their bearing on mineralizations in the Green Tuff re gion,Japan[J].Geochemical,1980,17:197～207.
[17]Shimazaki H and Sakai H.Regional varia tion of sulfur isotopic composition of skarn deposits in the western most part of the In ner Zone of Southwest Japan[J].M ining Geology,1984,34:419～424.
[18]Einaudi M T,Meinert L D and New berry R J.Skarn deposits[J].Economic Geology 75th anniversary volume,1981,317～391.
[19]Meinert L D.A review of skarns that cont ain gold[J].Mineralogical Association of Canada Short Course Series26,1998,359～414.
[20]陈雷,秦克章,李光明,李金祥,肖波,江化寨,赵俊兴,范新,江善元.西藏冈底斯南缘努日铜钨钼矿床地质特征与地球化学及Sr-Nd-Hf同位素证据[J].矿产地质,2012,31(3):471～437.
[21]Meinert L D,Dipple G M and Nicolescu S.World skarn deposits[C]//In:Hedenquist J W,Thompson J F H,Goldfarb R J,Rich ards J P,eds.Economic Geology100th An niversary Volume.Society of Economic Ge ologists,2005:299～336.
[22]顾雪祥,刘丽,董树义,等.山东沂南金铜铁矿床中的液态不混溶作用与成矿:流体包裹体和氢氧同位素证据[J].矿床地质,2010,29(1):43～57.
[24]华东冶金地质勘查局812队.安徽省池州市许桥银矿中间勘探地质报告[R].1995.
[23]张承帅.福建马坑铁矿床地质与地球化学[D].中国地质大学(北京),2012.
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