Ni-Cu-PGE Deposits in North America - ADIMB

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Assimilation of iron formation SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 FeO MnO MgO CaO Na 2 O K 2 O P 2 O 5 TOTAL picrite 47.07 0.70 10.72 1.70 10.24 0.21 16.83 10.09 0.54 0.71 0.05 99.88 silicate IF 52.93 0.17 5.29 10.57 22.18 0.34 2.40 0.49 0.39 2.31 0.43 99.72 model BIF 50.00 34.48 15.52 100.00 model IF 51.47 0.08 2.65 22.53 18.85 0.17 1.20 0.25 0.19 1.16 0.22 99.86 mix 20 47.95 0.57 9.10 5.87 11.96 0.20 13.70 8.12 0.47 0.80 0.08 99.88 Compositions of picrite and assimilants used in the MELTS modeling. Increases modal proportion of chromite in cumulates from < 1% to < 5%
Conduits as chemical reactors • influx of fresh magma • contamination, sulfide saturation • excess chromite crystallization • depleted magma exits system • sulfide collects in deepest parts of system • chromite forms layers 9 9
Page 1 and 2: Metallogeny of Chromite, Ni, Cu and
Page 3 and 4: Source - transport - trap • Large
Page 5 and 6: Plume magmas
Page 7: Chromite precipitation • Magma mi
Page 11 and 12: Physical environments
Page 13 and 14: Eagle Eagle’s Nest After Naldrett
Page 16 and 17: Eagle’s Nest up • Massive sulfi
Page 18 and 19: Circum-Superior Raglan deposits
Page 20 and 21: Raglan horizon Lesher et al, 2007
Page 22 and 23: Thompson Ni Belt Stratigraphic Colu
Page 24: Sudbury Structure Figure 1 B A Muns
Page 27 and 28: Strathcona Frood-Stobie Falconbridg
Page 29 and 30: Voisey’s Bay After Kerr and Ryan
Page 31 and 32: Ni-Cu-PGE Deposits in North America
Page 34 and 35: Mid-Continent Rift - Eagle Deposit
Page 36 and 37: Chromite occurences in North Americ
Page 38 and 39: Double Eagle Complex - 2735 Ma 38 3
Page 40 and 41: NOT 08 1G31 70 m chromitite interse
Page 42 and 43: Bird River belt • 2745 Ma • 3.6
Page 44 and 45: Stillwater Complex 2705 Ma Zeintek,
Page 46: Conclusions • Known giant deposit

Ni-Cu-PGE Deposits in North America - ADIMB

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