非传统稳定同位素-6a-应用实例课件.ppt

《非传统稳定同位素-6a-应用实例课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、白云鄂博矿床成因朱祥坤中国地质科学院地质研究所白云鄂博:富饶的神山丁道衡先生1927年发现铁矿石何作霖先生1936年发现含REE矿物(独居石)新中国成立后建立的第一座铁矿山白云鄂博矿区丁道衡塑像BayanOboREE-Nb-FedepositThelargestLREEoredepositintheworldAlargeNbdepositALargeFedepositTimingofMineralisationOriginoftheDepositGeologicalmapofBayanObooredeposit(a

2、fterBaietal.,1996)1—Overthrust;2—Inferredfault;3—Geologicalboundaries;4—Inferredgeologicalboundaries;5—Ironbodies;6—Carbonatitedykes;7—Ore-hosteddolomite;8—Fluoritetypeironores;9—Massivetypeironores;10—Aegirinetypeironores;11—Riebeckitetypeironores;12—Dolomite

3、typeironores;13—Biotitetypeironores;14—Samplelocation;15—Locationofdrillhole.H1~H15—UnitofBayanOboGroup,seetable1;C—Carboniferous;Q—Quaternary;H—Relictsofslateandquartzite;DT—Dolomitemarble;ST—Mineralizedslate;ε—Meta-ultrabasicrocks;µ—Migmatiticgneisses;γ—Gran

4、ites;γµ—MigmatiticGranites;δ—Basic-intermediaterocksTheore-hostingdolomitemarbleTheore-hostingdolomitemarbleMt：magnetiteHm：hematiteRE：REEmineralsAe：aegirineFl：fluoriteFlHmAeMtREREREMtAeHmFlFlIronoresLate-stageveinsDol:dolomite；Fl：fluorite；Mon：monaziteMonDolDol

5、DolFlThenormalcarbonatesedimentsonthenorthofKuangouMt0.5mmMtREAeMt：magnetiteRE：REEmineralsAe：aegirineMtDolFl0.5mmMtDolMt：magnetiteDol：dolomiteFl：fluorite0.5mmMtHmMt：magnetiteHm:hematiteFl：fluoriteFlCarbonatitedykesDolBarREDol：dolomite；RE：REEminerals；Bar：barite

6、1mmTimingofMineralisationOriginoftheDepositSm-Nd同位素体系:REE铁同位素：Fe矿镁同位素：白云质大理岩（寄主岩石）(143Nd/144Nd)p=(143Nd/144Nd)i+147Sm/144Nd(eλt-1)Singlesourceatt0(143Nd/144Nd)p=(143Nd/144Nd)i+147Sm/144Nd(eλt-1)Singlesourceatt0Twosourcesatt0andt1respectively(143Nd/144Nd)p=(143

7、Nd/144Nd)i+147Sm/144Nd(eλt-1)Singlesourceatt0Twosourcesatt0andt1respectivelySinglesourceatt0,recrystalisedatt1(143Nd/144Nd)p=(143Nd/144Nd)i+147Sm/144Nd(eλt-1)Allpublisedwhole-rockdata,ca.1.3Ga;εNd(t)=-0.2TimingofREEMineralizatiomInitial/mainmineralization:ca.1

8、.3Ga,mantlesource;Latestagemineralization:ca.0.44Ga,internalrecyclingOtherages:disturbanceTimingofMineralisationOriginoftheDepositTheorigin:hotdebateSedimentaryorigin?Hydrothermalo