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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指导教师2012年12月16日Title:OrthomagmaticoredepositsOne.OrthomagmaticoredepositsThemagmacontainsacertainnumberofmetalandvolatilecomponentsofthesilicatemelt.Allkindsofmagmaaftercrystallizationanddifferentiation,maketheformingmaterialsdispersedinthemagmagath
2、eredandformeddeposits.Andthisdepositsiscalledmagmaticdeposits.Magmaticdepositsformedinthemagmaticstage,thesourceofthematerialofthedepositisthemainore-bearingmagma.Magmaticdepositsistheproductofthemagmabycrystallizationanddifferentiation,andgenerallyhavethefollowingproperties:1、Depositshav
3、ethemainlyrelationshipwiththemaficandultramaficrocks.Andasmallnumberofmagmaticdepositswithalkalinerocksormagmaticcarbonatite-related.Mineralizationanddiagenesisoftenbeginatthesametime.Andthisistypicalofsyngeneticoredeposits.Fewmineralizationofthemagmaticdepositsmaybecontinuedtoalatertime,
4、butgenerallydoesnotexceedatotalperiodofmagmaticactivity.2、Themagmaticdepositsorebodymajoritypresentstratiform,stratiform,lenticularandpodiformandsoon.Andtheyproducedinthemagmabody,andthewallrockofcontainingoreisthemotherrock.Fewcases,orebodypresentingveinandstockworkenterthewallrockwhicho
5、utsideofthemotherrock.Betweentheorebodyandthewallrockgenerallyisgradualchangeorrapidgradualchangerelationship,.Onlypenetrationmagmaticdepositshavetheclearboundarieswiththewallrock.3、Excepttherareandrareearthelementsdepositsofthemagmaticcarbonatiteduetospecialcauseshavesomealterationaboutt
6、hewallrock,thevastmajorityofmagmaticdepositssurroundingrockdoesnothaveasignificantalterationphenomenon.4、Theoreandthewallrockbasicallyhavethesamemineralcomposition,whentheusefulmineralsoftherockbodyaggregateandreachacertainsize,theybecometheorebody.5、Theoreofmagmaticdepositsoftenhave,diss
7、eminated,thebanded,eyeporphyritic,densemassive,brecciatedandsoon,orestructure.Theoresstructurecanbebroadlydividedintothefollowingcategories:I.Structuresub-thedifferentmagmaticcondensatecrystallineorstackinginteractions;II.Reflectthestructureoftheimmisciblefluidcryst
