Black shales

Au-Pd-Ag mineralization in black shales of Onega depression, Karelia, Russia
N.S. Rudashevsky, Yo.L. Kretser

Grains of precious metal minerals from black shales of Onega depression (1-9); SEM images (BIE)


1-4 — numbers of analysis of one grain; POR — pores; Pd — native palladium; Au, Au3Ag, (Au,Ag,Pd), (Au,Cu,Ag), (Au,Ag,Pd,Cu)— native gold, Bi2O3 — bismite. 5 — part of 4; 7 — part of 6; 9 — part of 8.

 

Chemical composition (wt. %) of noble metal minerals from black shales of Onega depression

Anal. Au Ag Pd Cu Fe Total Photo and point of analysis Phases
185.814.0---99.81Au3Ag
260.527.2-12.1-99.8-(Au,Ag,Pd)3Cu
386.17.5-6.4-100.02(Au,Ag,Pd)3Cu
462.28.11.527.10.6100.0-(Au,Ag)Cu
542.223.2-34.2-99.6-(Au,Ag)Cu
633.349.70.516.0-99.5-(Au,Ag,Pd)3Cu
763.421.19.43.71.699.24 & 5, 1(Au,Ag,Pd,Cu)
852.711.214.618.91.699.04 & 5, 3(Au,Ag,Pd)3Cu
966.614.611.65.71.499.94 & 5, 4(Au,Ag,Pd,Cu)
109.21.683.35.40.8100.04 & 5, 2(Pd,Cu,Ag)
1167.920.610.11.3-99.96 & 7(Au,Ag,Pd)
1259.924.714.80.6-100.03, 1(Au,Ag,Pd)
1369.812.816.60.8-100.03, 2(Au,Pd,Ag)
1494.33.80.51.5-100.1-Au
1592.66.9---99.58(Au,Ag)
1692.76.9---99.68(Au,Ag)
1798.21.8---100.09Au
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