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1、2017硕士研究生专业英语试题地质工程专业一、英译汉(45分）MagmaticNi-Cusulfidedepositsformastheresultofsegregationandconcentrationofdropletsofliquidsulfidefrommaficorultramaficmagma,andthepartitioningofchalcophileelementsintothesefromthesilicatemelt.Sufidesaturationofamagmaisnotenoughinitselftoproducean
2、oredeposit.Theappropriatephysicalenvironmentisrequiredsothatthesulfideliquidmixeswithenoughmagmatobecomeadequatelyenrichedinchalcophilemetals,andthenisconcentrateditiarestrictedlocalitysothattheresultingconcentrationisoforegrade.ThedepositsoftheNoril'skregionhavedevelopedwithi
3、nflat,elongatebodies(15x2x0.2km)thatintrudeargillites,evaporitesandcoalmeasures,adjacenttoamajor,transcrustalfaultandimmediatelybelowthecentreofa3.5km-thickvolcanicbasin.Studiesoftheoverlyingbasaltshaveshownthatlavasforminga500m-thicksequencewithinthesehavelost75%oftheirCuandN
4、iandmorethan90%oftheirPGE.Overlyingbasaltsshowagradualrecoveryintheirchalcophileelementconcentrationstoreach''normal"values500mabovethetopofthehighlydepletedzone.Theore-bearingNoril'sk-typeintrusionscorrelatewiththosebasaltsabovethedepletedzonethatcontain''normal"levelsofchalc
5、ophileelements.Thehighproportionofsulfide(2±10wt.%)associatedwiththeNoril'sk-typeintrusions,thehighPGEcontentoftheores,theextensivemetamorphicaureole(100±400maroundthebodies),andtheheavysulfurisotopiccompositionoftheores(+8~+12a34S)areexplicableiftheore-bearingbodiesareexitcon
6、duitsfromhighlevelintrusions,alongwhichmagmahasowedenroutetoextrudeatsurface.Thefirstmagmatoentertheseintrusionsreactedwithmuchevaporiticsulfur,atalow''R"valueandthusgaverisetosulfideswithlowmetaltenors.Successiveflowofmagmathroughthesystemprogressivelyenrichedthesulfidesinthe
7、conduits,losingprogressivelylessoftheirchalcophilemetals,andthusaccountingfortheupwardincreaseinmetalsinsuccessivelavaflowsabovethehighlydepletedflows.TheVoisey'sBaydepositliespartlywithina30±100m-thicksheetoftroctolite,interpretedasafeederforthe1.334GaVoisey'sBayintrusion,and
8、partlyatlthebaseofthisintrusion,wherethefeederadjoinsit.Studi
