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1、中国地质大学长城学院地质英语论文系别地球科学与资源系专业资源勘查工程学生姓名学号03410501指导教师2012年12月16日Title:OrthomagmaticoredepositsOne.OrthomagmaticoredepositsThemagmacontainsacertainnumberofmetalandvolatilecomponentsofthesilicatemelt.Allkindsofmagmaaftercrystallizationanddifferentiation,mak
2、etheformingmaterialsdispersedinthemagmagatheredandformeddeposits.Andthisdepositsiscalledmagmaticdeposits.Magmaticdepositsformedinthemagmaticstage,thesourceofthematerialofthedepositisthemainore-bearingmagma.Magmaticdepositsistheproductofthemagmabycrystall
3、izationanddifferentiation,andgenerallyhavethefollowingproperties:1、Depositshavethemainlyrelationshipwiththemaficandultramaficrocks.Andasmallnumberofmagmaticdepositswithalkalinerocksormagmaticcarbonatite-related.Mineralizationanddiagenesisoftenbeginatthes
4、ametime.Andthisistypicalofsyngeneticoredeposits.Fewmineralizationofthemagmaticdepositsmaybecontinuedtoalatertime,butgenerallydoesnotexceedatotalperiodofmagmaticactivity.2、Themagmaticdepositsorebodymajoritypresentstratiform,stratiform,lenticularandpodifor
5、mandsoon.Andtheyproducedinthemagmabody,andthewallrockofcontainingoreisthemotherrock.Fewcases,orebodypresentingveinandstockworkenterthewallrockwhichoutsideofthemotherrock.Betweentheorebodyandthewallrockgenerallyisgradualchangeorrapidgradualchangerelations
6、hip,.Onlypenetrationmagmaticdepositshavetheclearboundarieswiththewallrock.3、Excepttherareandrareearthelementsdepositsofthemagmaticcarbonatiteduetospecialcauseshavesomealterationaboutthewallrock,thevastmajorityofmagmaticdepositssurroundingrockdoesnothavea
7、significantalterationphenomenon.4、Theoreandthewallrockbasicallyhavethesamemineralcomposition,whentheusefulmineralsoftherockbodyaggregateandreachacertainsize,theybecometheorebody.5、Theoreofmagmaticdepositsoftenhave,disseminated,thebanded,eyeporphyritic,de
8、nsemassive,brecciatedandsoon,orestructure.Theoresstructurecanbebroadlydividedintothefollowingcategories:I.Structuresub-thedifferentmagmaticcondensatecrystallineorstackinginteractions;II.Reflectthestructureoftheimmisciblefl
