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SIGNIFICANCE OF DUMORTIERITE INAN ALUMINOSILICATE.RICH ALTERATION ZONE, LOUVICOURT, OUEBEC



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t37 CanadianMineralogist Vol 3 I pp 137 146 1993 IN AN OFDUMORTIERITE SIGNIFICANCE ZONE ALTERATION ALUMINOSILICATE RICH OUEBEC LOUVICOURT MEHMETF TANER BP Resources Canala Limited lzs Mines Selbaie Case Postale j70 Joutel Qulbec JOY IN0 ROBERTF MARTIN McGill Universiry Sciences Department of EanhandPlanetary Street Montr 1al 3450University QutbecH3A2A7 ABSTRACI A dumortierite bearing aluminosilicate richzone of hydrothermalalterationhas beenfound in the northeasternsectorof Louvicourt Township in the Abitibi greenstonebelt Val d Or area Quebec The affectedschists metavolcanicrocks of e Malartic Group are andalusite bearing they are located near the southerncontact of the Bevcon pluton The presenceof I 1 822 5 nd20 251 7 A arelargerthanusuallyreported and dumonieritemakestherockspinkish Its a andb cell parameters of thedumortierite of vlMg andlvAI Thec diminsionis 4 698 I A Theaveragechemicalcomposition mayreflectthepresence surfaceexposure and differsslightly A16 sA4g0 r2Ti0 mFeo oootro zs x 0rB Si2 8lAl0 r4Po oa z seorz 0e oH q q l in two samples subsurface The dumortieritereplacesandalusite A16 62Mg6 67Ti6 orF o orio r ril ir A1o i o oJo 6 OH 1 16 whi ii fodA diiring iii6 miitari irphis d aafom ri nbf the intenselyleachedmetavolcanicrocks The introductionof boron belt provides avaluable thusoccunedlate Thepresenceof dumortierite heredescribedfor thefint time in theAbitrbi greenstone targetfor further explorationbecauseof the link betweenperaluminousalteredrocksandzonesof Au andCu mineralization Keywords dumortierite ce l dimensions electron microprobedat4 andalusite alterationzones boron Louvicour Val d Or mining district Abitibi belt Quebec Souuens Nousd6crivonsunezoned altdrationricheenaluminosilicateet contenantdela dumorti6ritedansle secteurnord estdu canton de Louvicourt ceinturedesrochesvertesde l Abitibi r6gion de Val d Or Qudbec ks schistesaffectds d l origine desroches m tavolcaniquesdu Groupede Malartic contiennentde I andalousite ils sont situdsprdsdu



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