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《哀牢山成矿带壳幔相互作用与金成矿关系探讨——以元阳大坪金矿床为例.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、2010年4月矿床地质第29卷第2期April,2010MINERALDEPOSITSVo1.29No.2文章编号:0258—7106(2010)02~0253—12哀牢山成矿带壳幔相互作用与金成矿关系探讨以元阳大坪金矿床为例袁士松,一,葛良胜2,路彦明2,郭晓东,一,王关娟2,王治华一,邹依林,2(1中国地质大学地球科学与资源学院,北京100083;2中国人民武装警察部队黄金地质研究所,河北廊坊065000)摘要哀牢山成矿带位于云南省中南部,带内相续发现了墨江金厂、镇沅老王寨和元阳大坪等一批大型一超大型金多金属矿床。滇西南地区的莫霍面等深度特征、大陆地温梯度和大地热流高异常特
2、征以及地球深层次结构特征,一致表明哀牢山地区在新生代处于强烈的壳幔相互作用时期。以大坪超大型金矿床同位素组成为例开展了示踪学研究,结果表明,成矿物质及成矿流体均以上地幔或下地壳来源为主,成矿过程中有少量地壳浅部的大气饱和水、岩浆水或它们的混合流体的加入。区域地球物理场特征及同位素示踪学研究一致表明,在哀牢山成矿带内矿床形成过程中,伴随有强烈的深部岩浆活动,壳幔相互作用对该地区矿床的形成有重要贡献。关键词地质学;壳幔相互作用;哀牢山成矿带;超大型矿床;大坪金矿;云南中图分类号:P618.51文献标志码:ARelationshipbetweencrust-mantlereactio
3、nandgoldmineralizationinAilaoshanmetallogenicbelt:AcasestudyofDapinggolddepositinYuanyangYUANShiSong一,GELiangSheng2,LUYanMing2,GUoXiaoDong一,WANGMeiJuan2,WANGZhiHua1,2andZOUYiLinl,2(1SchoolofEarthScienceandResources,ChinaUniversityofGeoscienees,Beijing100083,China;2GoldGeologicalInstituteofCA
4、PF,Landang065000,Hebei,China)AbstractTheAilaoshanmetallogenicbeltislocatedinthemiddle-southpartofYunnanProvince,wherethereareseverallarge-superlargegold-polymetallicdepositssuchasJinchanginMojiang,LaowangzhaiinZhenyuanandDapinginYuanyang.RegionalgeophysicalcharacteristicsshowthattheNW—striki
5、ngAilaoshanmetallogenicbelthasacomplicatedcrust—mantlestructure.TheMohodisamtinu-ityisobathfeaturesrevealthatthecrustinthenortheastisthickerthanthatinthesouthwestandrepresentsamantle-slopeonthewhole.Regionalstudiesoftheseismicwavevelocityofthelowercrustandtheuppermantleindicatethatthereexist
6、salarge-arealow-velocityanomalousbeltinsouthwestYunnanProvince,whichperhapshasrelationshipwiththethermaldynamicaleffectcausedbypartialmeltofthelowercrustmaterialsresultingfromtheupliftoftheuppermantlematerialsinthecrust—mantleboundary.Suchaphenomenonalsoimpliesthatthereonceoccurredastrongcru
7、st—mantlereactionintheAilaoshanmetalogenicbelt.Thehighanorlla—lousfeaturesofthecontinentalgeothermalgradientandtheterrestrialheatflowdemonstratethatthemetallogenicbelthascharacteris—ticsofhigh-temperatureandlow—pressuremantleslope,whichmightbeattri
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