精品资料长安大学资源学院英语文献翻译学院地球科学与资源学院专业资源勘查工程学生姓名张桃学号201127020308指导教师张亚敏2015年6月18日Title:OrthomagmaticoredepositsOne.OrthomagmaticoredepositsThemagmacontainsacertainnumberofmetaland精品资料volatilecomponentsofthesilicatemelt.Allkindsofmagmaaftercrystallizationanddifferentiation,maketheformingmaterialsdispersedinthemagmagatheredandformeddeposits.Andthisdepositsiscalledmagmaticdeposits.Magmaticdepositsformedinthemagmaticstage,thesourceofthematerialofthedepositisthemainore-bearingmagma.Magmaticdepositsistheproductofthemagmabycrystallizationanddifferentiation,andgenerallyhavethefollowingproperties:1、Depositshavethemainlyrelationshipwiththemaficandultramaficrocks.Andasmallnumberofmagmaticdepositswithalkalinerocksormagmaticcarbonatite-related.Mineralizationanddiagenesisoftenbeginatthesametime.Andthisistypicalofsyngeneticoredeposits.Fewmineralizationofthemagmaticdepositsmaybecontinuedtoalatertime,butgenerallydoesnotexceedatotalperiodofmagmaticactivity.2、Themagmaticdepositsorebodymajoritypresentstratiform,lenticularandpodiformandsoon.Andtheyproducedinthemagmabody,andthewallrockofcontainingoreisthemotherrock.Fewcases,orebodypresentingveinandstockworkenterthewallrockwhichoutsideofthemotherrockBetweentheorebodyandthewallrockgenerallyisgradualchangeorrapidgradualchangerelationship.Onlypenetrationmagmaticdepositshavetheclearboundarieswiththewallrock.3、Excepttherareandrareearthelementsdepositsofthemagmaticcarbonatiteduetospecialcauseshavesomealterationaboutthewallrock,thevastmajorityofmagmaticdepositssurroundingrockdoesnothaveasignificantalterationphenomenon.4、Theoreandthewallrockbasicallyhavethesamemineralcomposition,whentheusefulmineralsoftherockbodyaggregateandreachacertainsize,theybecometheorebody.5、Theoreofmagmaticdepositsoftenhave,disseminated,thebanded,eyeporphyritic,densemassive,brecciatedandsoon,orestructure.Theoresstructurecanbebroadlydividedintothefollowingcategories:I.Structuresub-thedifferentmagmaticcondensatecrystallineorstackinginteractions;II.Reflectthestructureoftheimmisciblefluidcrystallization精品资料processIII.Reflectthechangesinthestructureofthephysicalandchemicalconditions.IV.Epigeneticstructure.6、Themagmaticdepositsformingtemperatureishigh,generallybetween1200to700°C.Themineralizationdepthchanges,generallyformedinthegroundafewkilometerstotensofkilometers.Tow.TheformationconditionsofmagmaticdepositsMagmadepositsaremainlyderivedfromthemagma,itisthecombinedeffectsoftheproductbyavarietyofgeologicalfactors,whichplayingaleadingroleisthegeochemistryofore-formingelementstraits,themagmaticrockconditions,tectonicconditionsandphysicalandchemicalconditionsandsoon.1、ControltheconditionsofmagmaticrocksformedbymagmaticdepositsMagmaisthemainproviderofthemetallogenicmaterialofthemagmaticdepositsandthemediumofcontainingmineralmedium.Therefore,howmuchofthecontentofusefulcomponentsofmagmaisthepossibilityoftheformationofmagmaticdeposits.I.MagmaticrocksmetallogenicspecializationMetallogenicspecializationofmagmaticrocksinthegenesisofmagmaticrockswithendogenousdepositsshowedregularcontact,andspecifictypesofmagmaticrocksareoftenproducedspecifictypesofdeposits.a)WithmaficandultramaficintrusiverocksrelateddepositsMaficandultramaficrockisthecomplexigneouscomplexformedbythecombinationofavarietyofrocktypes,rocktypesfromasinglerockcompose...
