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The Occurrence of Getchellite (Assbs3) at Zarshuran As - Au Deposit

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The Occurrence of Getchellite (Assbs3) at Zarshuran As - Au Deposit Vol. 17, No. 2, Summer 1388/2009 The occurrence of Getchellite (AsSbS3) at Zarshuran As - Au deposit M. Karimi Department of Geology, Islamic Azad University of Shiraz Email: Karimi _ Mehrdad@ iaushiraz.ac.ir (Received: 6/6/2008, in revised form: 29/1/2009) Abstract: The variety of lithologies from Late Precambrian to Quaternary and suitable conditions for mineralization caused formation of Zarshuran gold and arsenic deposit in black schists, shale, limestone and dolomite. The ore paragenesis include As, Sb, Fe, Pb, Zn, Hg sulfides and gold along with fluorite, barite and quartz. The most important alteration is silicification which is more obvious in the ore zone and formed jasperoid. The gold in this deposit is found as very fine grains and is rarely visible. The rare Getchellite occurred in arsenic ore zone of Zarshuran as a red mineral with (001) cleavage. Paragenetically, this mineral is intermediate between As and Sb sulfides. Getchellite found in some epithermal gold deposits, can be used as a gold tracer. Keywords: Getchellite, Epithermal gold deposits, Zarshuran, Takab. bet 1 bea [\JS # E,91 d l K$ ZF4JF X& ! (AsSbS3) "#$ $%& #!$ %&# #' ()# &*$ !" Karimi _ [email protected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D9 D;U" BDF 0;9 l#4D# . &# 08 V!& E' ;8# !D9 a/g ,D& e/|b D(• B# # ;U" .(e @+$) 40$ HD !,K,D& C 1 " 7 &# E !+ b„„ 1 a„ =&0, E 09 ]! & ;5 9 #!9*9 &# ƒ0 ƒ B*6 .[e]4& !D7 1 ˆv E' # E#01 K 908 9 ‡ 01 S8 H E# 0DD$ DD;U" KDD$ DD H{1 (DD a X 4DDA D7 . 40D$ D1 DT 9 # ' 9 ˆ? &# ] _ {, Q 0DS BDFD& !9 . 4DF D E)D # @U" E4< ;U" +0D- BDF 0;9 Q 0DS D9 -0+D& !+ ˆ? ;U" - D E) E# 0$ ;U" # !,+# y0+& !+ 9 , !" 4D ,3 B#‚1 @+$ . 0$ 4 B# ‚1 B 0)* 4D$ @+)D1 S Sb, As!S*5 >7!1 # 7 # 7 4F 4D$ D1 ‡ 0D1 ‰vD&!9 0K5 B,&# ˆv 7 0$ .(j g @+$) &# .(Or)*K- # (Go) %? #!KF 9 (Ge) ;U" 7 : B ,& [0K (Ge) ;U" 7 A :< 5 .B 5 0 :B ,46vT 0 : A .;& .*7 , ‡ 01 ‰v& !9 0K5 B,&# (Ge) ;U" B#‚1 BF 0;9 = 5 .[j] @U" E# 0$ 7 ;U" 7 K$ H{1 ( 6 > ? Getchellite in Zarshuran Getchellite in Getchell S = 34.24 % S = 32.82 % As = 26.42 As = 25.09 Sb = 40.01 Sb = 42.04 K !7 # ! d n- N 9 D;U" As Sb !S*5 01 :B (Ge) ;U" B#‚1 7 # (SEM) )9 !,+# y0+& !+ ! 0r1 A @ 5 .SEM 9 "4*7#!- .E# 0$ ;U" 7 # !,+# y0+& !+ 9 EDX K7 K [ H{1 # 0K A5 D9 BFn+;PK7 H Zn ,Pb ,Cu ,Ag Q#H; X,# !;7 5B CC( 8* D D # .4D# ,D$# mD Hg ,Sb As ,Au X,# 4J0& BFr) 9 ;7 z61 # E#4 F7 "4*7#!- F D9 0D9 #4D - !D;7 BDF n+;PDK7 )D # = #!$ D # D7 #0D1 D<1 E# 0D$ D7 ,8& #4D - 4J0D& D9 BDF n+;PK7 40$ H{1 5!& 9 0A # 9 .
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