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地质英语论文
Title:Orthomagmaticoredeposits
One.Orthomagmaticoredeposits
Themagmacontainsacertainnumberofmetalandvolatilecomponents
ofthesilicatemelt.Allkindsofmagmaaftercrystallizationand
differentiation,maketheformingmaterialsdispersedinthemagma
gatheredandformeddeposits.Andthisdepositsiscalledmagmatic
deposits.
Magmaticdepositsformedinthemagmaticstage,thesourceofthe
materialofthedepositisthemainore-bearingmagma.
Magmaticdepositsistheproductofthemagmabycrystallization
anddifferentiation,andgenerallyhavethefollowingproperties:
1、Depositshavethemainlyrelationshipwiththemaficand
ultramaficrocks.Andasmallnumberofmagmaticdepositswithalkaline
rocksormagmaticcarbonatite-related.Mineralizationanddiagenesis
oftenbeginatthesametime.Andthisistypicalofsyngeneticoredeposits.
Fewmineralizationofthemagmaticdepositsmaybecontinuedtoalater
time,butgenerallydoesnotexceedatotalperiodofmagmaticactivity.
2、Themagmaticdepositsorebodymajoritypresent
stratiform,stratiform,lenticularandpodiformandsoon.Andthey
producedinthemagmabody,andthewallrockofcontainingoreisthe
motherrock.Fewcases,orebodypresentingveinandstockworkenterthe
wallrockwhichoutsideofthemotherrock.Betweentheorebodyandthe
wallrockgenerallyisgradualchangeorrapidgradualchange
relationship,.Onlypenetrationmagmaticdepositshavetheclear
boundarieswiththewallrock.
3、Excepttherareandrareearthelementsdepositsofthemagmatic
carbonatiteduetospecialcauseshavesomealterationaboutthewall
rock,thevastmajorityofmagmaticdepositssurroundingrockdoesnot
haveasignificantalterationphenomenon.
4、Theoreandthewallrockbasicallyhavethesamemineral
composition,whentheusefulmineralsof
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