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页数:12页
时间:2020-03-23
《Don Javier斑岩型铜钼矿床地质特征.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、2013年12月矿床地质第32卷第6期December,2013MINERALDEPOSITS32(6):1l59~1170文章编号:0258—7106(2013)06—1159—12DonJavier斑岩型铜钼矿床地质特征吴斌,方针,叶震超2一(1中国地质大学,北京100083;2中南大学地球科学与信息物理学院,湖南长沙410083)摘要DonJavier矿床是在秘鲁南部新发现的大型斑岩铜钼矿床,位于秘鲁古近纪斑岩型铜铝成矿带内。该矿区主要出露Yarabamba花岗闪长岩体,NW走向的矿体赋存于英安斑岩及其围岩中。主要的矿石矿物有黄铜矿、辉钼矿、辉铜矿等。矿化蚀变由内向
2、外依次为钾化、石英一绢云母化、泥化、青磐岩化,具有典型斑岩型铜矿床的蚀变分带特征。矿体呈筒状,主要分布于石英一绢云母化蚀变带中。矿区内的英安斑岩有4期,其中的前2期与矿化有关,后2期为成矿后侵位。NW向断裂是区内主要的控矿构造,对成岩成矿具有控制作用。与同一成矿带内相邻的CerroVerde超大型斑岩型铜矿床相比较,两者具有类似的成矿特征。找矿实践表明,强烈的蚀变带、低阻高极化激电异常是找矿的有效标志。关键词地质学;斑岩铜矿;斑岩期次;矿化蚀变;矿床对比;DonJavier;秘鲁中图分类号:P618.41;P618.65文献标志码:AGeologicalcharacter
3、isticsofDonJavierporphyrycoppermolybdenumdepositWUBinI.FANGZhenandYEZhenChao2(1ChinaUniversityofGeosciences,Beijing100083,China;2SchoolofGeosciencesandInfo-Physics,CentralSouthUniversity,Changsha410083,Hunan,China)AbstractTheDonJavierdepositisalarge—sizeporphyryCu-Modepositnewlydiscovered
4、insouthernPeru.Itis1o—catedinthePalaeogenecopperandmolybdenummetallogenicbeltofPeru.ThemainoutcropintheminingareaisthegranodioriteofYarabamba.andtheNw—strikingorebodyishostedinthedaciteporphyryanditscountryrock.Theprincipaloremineralsmainlyincludechalcopyrite,molykIdeniteandchacocite;from
5、theinnerpartoutwardsthemineralalterationsarepotassicalteration,quartz-sericitization,argillizationandpropylitization,withtypicalporphyrycopperalterationzonation;theorebodypresentscylindricalformandismainlydistributedinthequartz—sericitizationzone;thedaciteporphyryintheminingareaconsistsof
6、4phasesofdaciteporphyries,amongwhichtheformer2phasesareassociatedwithmineralization,whereasthelatter2phasesbelongtopostmineralizationemplacement.TheDonJavierdepositissimilartothenearbyCerroVerdedeposit,asuperlargecopperporphyrydepositinthesamemetallogenicbelt.inmetallogeniccharacteristics
7、.TheNw—strikingfractureisthemainore—controllingstructure,whichcontrolledtherock—formingandore-formingprocess.ProspectingpracticeverifiesthatintensealterationbeltsandlowresistivityandhighIPanomaliesareeffectiveindicatorsintheprospectingactivity.Keywords:geology,porph
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