第二章 矿床学基础Word下载.docx

第二章 矿床学基础Word下载.docx

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ageologicalbodythatisformedbygeologicalactionintheearth'

scrustandwhosequalityandquantitymeetindustrialrequirementsandcanbeusedinexistingeconomicandtechnologicalconditions.Oredepositsarecomposedoforebodiesandsurroundingrocks,andoneormoreorebodiesmaybeincludedinthedeposits.

1,syngeneticdeposit（syngeneticdeposits）:

theorebodyandthesurroundingrockareformedinthesamegeologicalprocessatthesametimeoratthesametime.

2,epigeneticoredeposits（epigenetic,deposits）:

theformationoforebodiesisobviouslylaterthanakindoforedepositsofsurroundingrock.

Two,orebodyandsurroundingrock

1,body（ore）:

anindependentgeologicalbodycomposedofore（ore）andgangue（gangue）,isthemaincomponentofthedeposit,andisthemainobjectofminingandutilization.Theorebodyhasadefiniteshape（form/morphology）,sizeandmodeof（occurrence）,andoccupiesacertainspatiallocation,surroundedbysurroundingrock.

2,（countryrock,hostrockrock,wallrock）:

referstotheorebodyofsurroundingrock,theboundaryofsomeveryclear（suchasvein）,andsomeshowedgradualtransition（suchascomposedofveinletdisseminatedoreore）.

3,rock（mother）:

referstotheformationoforedepositsintheprocessofprovidingmineralsfromthesourcerock.Itiscloselyrelatedtooredepositsinspaceandgenesis.MagnesianchromiteisthemotherrockofCHROMITEDEPOSIT,suchaschromiteoreformationinmagnesianrichultrabasicrockformedbymagmaticcrystallizationdifferentiation.

4,theshapeoftheorebody（formoforebody）,thatis,theshapeoftheorebody.Theorebodiesaredividedintothreebasictypesaccordingtotheproportionofthelengthofthespaceinthethreedimension

1）equiaxedorebody:

threeorebodiestobalancetheextension,suchasnodule（diametertensofmetersabove）,thenest（thediameterofonlyafewmetersabove）,orebagsandpockets（smaller）.Ifonedirectionisshort,andthewebbingthinforlenticularorlenticular.

2）plateshapedorebody:

twotoextend

（1）orelayer:

theplateshapedorebodyformedundersedimentaryaction,whichisconsistentwiththesurroundingrock;

alsoknownasstratiformandstratiformorebodies.

（2）vein:

aplateshapedorebodyformedinvariouskindsofrockfractures;

atypicalepigenetic.

Theoreseamsaredistinguishedbystratiformveins:

theorebedsarelargeinsizeanduniforminthickness;

theyoccurinbeddingfissures;

thestratifiedveinshavepointedendsandareproducedinthethroughcracks.

3）columnarorebody:

alwaysextended（mostlyvertical）,alsoknownastubularortubular.Suchasdiamonddeposits,tubularorebodies

5,bodyof（modeoccurrenceofore）:

referstotheorebodyinthecrustoftheoutputofthespaceposition.

1）occurrencefactors:

strike,dip,dipangle,sidebendangle,dipangle-narrowsenseofoccurrence

2）burialdepth:

openpitmineandconcealedore（alsocalledblindorebody）

3）relationshipwithrockmass:

insideoroutsideofrockbodyorcontactzone

4）relationshipwithsedimentaryrocks:

conformablyorwearallrelationsandbedding,schistosity

5）therelationwiththestructure:

thepositioninthestructureandtherelationwiththespaceoffractureandfold

Threeoreandgangue

1ore（ore）:

amineralaggregatethatisextractedfromanorebodyandcanbeextractedfromtheoreandisofeconomicvalueundercurrenteconomicandtechnologicalconditions.Oreiscomposedoforemineralsandgangueminerals.Thepresenteconomicandtechnicalconditionsofrockhavenoeconomicvalue.

1）oreminerals（ore,mineral）:

usefulmineralsinOres

2）gangueminerals（Rocky,mineral）:

uselessmineralsinOres

2,oregrade（tenor,of,ore）:

oreusefulcomponentsofthepercentagecontent.Representedbytheweightpercentcontent（%）oftheelements（oxides,Fe,W,V,Ti）;

preciousmetalsarerepresentedbyg/t;

diamondsarerepresentedbymg/t;

placerisrepresentedbyg/m3orkg/m3.

1）industrialgrade（production,tenor）;

thelowestaveragegradeoforebodiesthatcanbeminedandutilized

2）boundarygrade（boundary,tenor）;

usedtodeterminethegradeoforeorrock,orebodiesandboundariesofthesurroundingrock

3,oregrade

Oregrade（grade,of,ore）:

anoregradedeterminedbytheamountofbeneficialandharmfulcomponentsofanoreinindustrialproduction.

4,orefabric（fabric,of,ore）

（1）ore