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1、2010年4月礦床地質(zhì)第29卷第2期April,2010MINERALDEPOSITSVo1.29No.2文章編號(hào):0258—7106(2010)02~0253—12哀牢山成礦帶殼幔相互作用與金成礦關(guān)系探討以元陽(yáng)大坪金礦床為例袁士松,一,葛良勝2,路彥明2,郭曉東,一,王關(guān)娟2,王治華一,鄒依林,2(1中國(guó)地質(zhì)大學(xué)地球科學(xué)與資源學(xué)院,北京100083;2中國(guó)人民武裝警察部隊(duì)黃金地質(zhì)研究所,河北廊坊065000)摘要哀牢山成礦帶位于云南省中南部,帶內(nèi)相續(xù)發(fā)現(xiàn)了墨江金廠、鎮(zhèn)沅老王寨和元陽(yáng)大坪等一批大型一超大型金多金屬礦床。滇西南地區(qū)的莫霍面等深度特征、大陸地溫梯度和大地?zé)崃鞲弋惓L?/p>
2、征以及地球深層次結(jié)構(gòu)特征,一致表明哀牢山地區(qū)在新生代處于強(qiáng)烈的殼幔相互作用時(shí)期。以大坪超大型金礦床同位素組成為例開(kāi)展了示蹤學(xué)研究,結(jié)果表明,成礦物質(zhì)及成礦流體均以上地?;蛳碌貧?lái)源為主,成礦過(guò)程中有少量地殼淺部的大氣飽和水、巖漿水或它們的混合流體的加入。區(qū)域地球物理場(chǎng)特征及同位素示蹤學(xué)研究一致表明,在哀牢山成礦帶內(nèi)礦床形成過(guò)程中,伴隨有強(qiáng)烈的深部巖漿活動(dòng),殼幔相互作用對(duì)該地區(qū)礦床的形成有重要貢獻(xiàn)。關(guān)鍵詞地質(zhì)學(xué);殼幔相互作用;哀牢山成礦帶;超大型礦床;大坪金礦;云南中圖分類(lèi)號(hào):P618.51文獻(xiàn)標(biāo)志碼: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