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Precious metals in the Morrison deposit, Sudbury, Canada
Języki publikacji
Abstrakty
W położonym w zagłębiu Sudbury złożu Morrison eksploatuje się rudę zawierającą miedź, nikiel, platynę, pallad oraz złoto. W składzie mineralnym dominuje chalkopiryt, natomiast głównymi minerałami niklu są pentlandyt oraz milleryt. Pobrane próbki zawierają także kubanit, mackinawit, pirotyn, magnetyt, sfaleryt oraz galenę. W peryferyjnych częściach żył przeważa bornit, który nierzadko zawiera żyłki srebra rodzimego. Platyna występuje w formie własnych minerałów, wśród których dominują kompozytowe agregaty moncheitu (PtTe2) z hessytem (Ag2Te), rzadziej występują masłowit (PtBiTe) oraz sperrylit (PtAs2). Pallad może występować jako podstawienia w pentlandycie, tworzy także własne minerały: micheneryt (PdBiTe) i paołowit (Pd2Sn). Tellurki i bizmuto-tellurki wykazują podstawienia Pt-Pd oraz Bi-Te. Złoto występuje w formie rodzimej oraz jako elektrum. Obserwowana strefowość w występowaniu pierwiastków może być wyjaśniona frakcjonalną krystalizacją magmowych siarczków. Prawdopodobna jest częściowa remobilizacja metali szlachetnych (zwłaszcza złota i palladu) przez późniejsze procesy hydrotermalne i/lub metamorficzne, z którymi jest związana obecność idiomorficznego kwarcu, krzemianów (epidot, amfibole) oraz wtórnego magnetytu zawierającego inkluzje siarczków.
The Morrison deposit, located in Sudbury Mining Camp, produces ore containing copper, nickel, platinum, palladium and gold. Chalcopyrite dominates the mineral assemblage, while the main Ni-bearing phases are pentlandite and millerite. Cubanite, mackinawite, pyrrhotite, magnetite, sphalerite and galena are present too. Bornite is the main mineral in the peripheral parts of veins, often containing native silver veinlets. Platinum occurs as discrete PGM minerals: composite grains of moncheite (PtTe2) with hessite (Ag2Te); maslovite (PtBiTe) and sperrylite (PtAs2) are rare. Palladium can occur as a substitution in pentlandite and as discrete PGM minerals: michenerite (PdBiTe) and paolovite (Pd2Sn). Tellurides and bismuth-tellurides often display Pt-Pd and Bi-Te substitutions. Gold is present as a native element and as electrum. A zonation in the occurrence of elements can be explained by fractional crystallization of magmatic sulphides. There is a possibility of partial remobilization of precious metals (especially gold and palladium) by later hydrothermal and/or metamorphic processes with associated authigenic quartz, silicates (epidote, amphiboles) and secondary magnetite containing sulphide inclusions.
Czasopismo
Rocznik
Tom
Strony
251--264
Opis fizyczny
Bibliogr. 42 poz., rys., tab., zdj.
Twórcy
autor
- AGH Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska, al. Mickiewicza 30, 30-059 Kraków
autor
- AGH Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska, al. Mickiewicza 30, 30-059 Kraków
autor
- AGH Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska, al. Mickiewicza 30, 30-059 Kraków
autor
- AGH Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska, al. Mickiewicza 30, 30-059 Kraków
Bibliografia
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- 21. HOLWELL D.A., McDONALD I., 2010 — A review of the behaviour of platinum group elements within natural magmatic sulfide ore systems. Platinum Metals Rev., 54, 1: 26–36.
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- 29. MAIER W.D., LI C., DE WAAL S.A., 2001 — Why are there no major Ni–Cu sulfide deposits in large layered mafic-ultramafic intrusions? The Canadian Mineralogist, 39, 2: 547–556.
- 30. MOLNÁR F., WATKINSON D.H., JONES P.C., 2001 — Multiple hydrothermal processes in footwall units of the North Range, Sudbury Igneous Complex, Canada, and implications for the genesis of vein-type Cu-Ni-PGE deposits. Econ. Geol., 96, 7: 1645–1670.
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- 35. NELLES E.W., 2012 — Genesis of Cu-PGE-rich footwall-type mineralization in the Morrison deposit, Sudbury [M.Sc. thesis]. Laurentian University, Sudbury, Ontario.
- 36. PÉNTEK A., MOLNÁR F., WATKINSON D.H., JONES P.C., 2008 — Footwall-type Cu-Ni-PGE mineralization in the Broken Hammer area, Wisner Township, North Range, Sudbury structure. Econ. Geol., 103, 5: 1005–1028.
- 37. PEREGOEDOVA A., OHNENSTETTER M., 2002 — Collectors of Pt, Pd and Rh in a S-poor Fe–Ni–Cu sulfide system at 760°C: experimental data and application to ore deposits. The Canadian Mineralogist, 40, 2: 527–561.
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- 39. PIESTRZYŃSKI A., PIECZONKA J., GŁUSZEK A., 2002 — Redbed-type gold mineralisation, Kupferschiefer, south-west Poland. Miner. Deposita, 37, 5: 512–528.
- 40. REIMOLD W.U., GIBSON R.L., 1996 — Geology and evolution of the Vredefort impact structure, South Africa. Journal of African Earth Sciences, 23, 2: 125–162.
- 41. TUBA G., MOLNÁR F., WATKINSON D.H., JONES P.C., MOGESSIE A., 2010 — Hydrothermal vein and alteration assemblages associated with low-sulfide footwall Cu-Ni-PGE mineralization and regional hydrothermal processes, North and East Ranges, Sudbury structure, Canada. Soc. Econ. Geol. Sp. Publ., 15: 573–598.
- 42. WAWRZONKOWSKI P., McDONALD A.M., 2015 — A study of the Cu-Ni-Fe-S mineralogy of footwall veins at the McCreedy East mine, Sudbury, Ontario: The formation of millerite and origin of splays from trunk veins. Montreal, May 2015, AGU-GAC-MAC meeting.
Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-aab6b377-6957-4670-9367-2d7fc797aff5