pentlandite in troctolitic
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Contrasts between platinum group element contents and ...
Sulfides occur in only trace amounts in anorthositic series rocks as interstitial grains, inclusions in plagioclase, and veinlets cutting olivine. These textures and the sulfide assemblage (pyrrhotite, pentlandite and chalcopyrite) are similar to the sulfide mineralization in troctolitic series rocks.
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Platinum and Palladium in Mafic-Ultramafic neous Rocks ...
are not uncommon in troctolitic rocks elsewhere, and they frequently are involved in strongly altered zones within such rocks. Such alteration has been ascribed variously to …
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Sulfur isotopic studies of the Dunka Road Cu-Ni deposit ...
Abstract. The Dunka Road deposit is one of a series of Cu-Ni occurrences located within troctolitic rocks of the southern portion of the Duluth Complex, Minnesota.
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Variation in the Cu-Ni-PGE Mineralization in the South ...
the troctolitic Partridge River intrusion on the southwest, is inferred to be semi-conformable to the later Bald Eagle intrusion to the east, and abuts and cuts older Anorthositic Series rocks to the northeast. The basal mineralization within the SKI occurs dominantly in heterogeneous zones of troctolitic, gabbroic, noritic, and ultramafic rocks.
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Devolatilization equilibria in the genesis of the Dunka ...
The Dunka Road deposit is one of several located along the basal contact of the Duluth Complex. Host rocks for pyrrhotite-chalcopyrite-cubanite mineralization are troctolites, with country rocks composed of pelitic metasedimentary rocks of the ia Formation (V.F.) and underlying rocks of the ...
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The geology and mineralogy of some Fe-Cu-Ni sulphide ...
The geology and mineralogy of some Fe-Cu-Ni sulphide deposits in the Bamble area, Norway JOHN D. BRICKWOOD Brickwood, J. D. 1986: The geology and mineralogy of some Fe-Cu-Ni sulphide deposits in the Bam
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Magma evolution and PGE mineralization in the Mechanic ...
The Mechanic Settlement pluton, southern New Brunswick, is a high-level mafic-ultramafic pluton of Late Neoproterozoic age (ca. 557 Ma). Based on surface outcrop and drill core samples, the pluton includes six different lithologic assemblages: peridotitic, olivine-bearing gabbroic, gabbroic, anorthositic, troctolitic, and dioritic, each of which consists of a range of related rock types.
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Explore Minnesota: TITANIUM - Minnesota Department of ...
Explore Minnesota: TITANIUM. ... chalcopyrite and pentlandite. At the Titac prospect, the intrusion contains up to five modal percent copper minerals (predomin ately chalcopyrite and ... (troctolitic) rocks. Note that the root zone of the OUI has not been drilled. From NRRI (2010)
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CORE
Disseminated sulfides, ranging in concentration from 1 to 2 volume percent, occur throughout he troctolitic sequence but are in general concentrated near the basal contact with rocks of the metasedimentary ia Formation. Principal sulfide minerals are pyrrhotite, chalcopyrite, cubanite, and minor pentlandite.
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Magma evolution and PGE mineralization in the Mechanic ...
Magma evolution and PGE mineralization in the Late Neoproterozoic Mechanic Settlement Pluton, southern New Brunswick Russel S. Heibert Department of Earth and Environmental Science, Acadia University, Wolfville, Nova Scotia B4P 2R6, Canada.
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A study of the trace sulfide mineral assemblages in the ...
Ternary diagrams of pentlandite, chalcopyrite, and pyrrhotite proportions in gabbroic and troctolitic samples of the Middle Banded series The sulfide proportions column of Fig. 4 shows that pentlandite increases upwards from the base of PZ to ∼G-chromitite, paralleling the increase in Cl content of apatite.
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COPPER AND NICKEL RESOURCES IN THE DULUTH COMPLEX ...
chalcopyrite, cubanite, and pentlandite, and the av ... The Duluth Complex is a large body of mafic and anortho ... Troctolitic series comprise the northwestern, or basal part of the complex, whereas rocks of the Anorthositic series oc cupy broad areas several miles in extent southeast of the ...
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FURTHER INTERPRETATTON OF THE Gu-Fe-Ni SULFTDE ...
rhotite, pentlandite, chalcopyrite, cubanite) and also tex-turally similar. In the Inco suite, however, both magnetite and ilmenite are present, whereas troilite is rare. In con-trast, the occurrence of troilite and vapor-deposited graphite, as also the presen.s el ilmenite without magnetite, in the suite from Minnamax, suggests that the ...
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Platinum Group Element Occurences in the Basal Zone of the ...
chalcopyrite, cubaniteand some pentlandite which is the primary mineralization in the Water Hen deposit; the second consists oUate stage chalcopyrite, bornite, maucherite, native bismuth, niccolite, parkerite, native Ag and tetradymite.
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Hydrothermal alteration and Cu–Ni–PGE mobilization in the ...
Hydrothermal processes and their roles in PGE remobilization in the troctolitic intrusions of the DC have been demonstrated by Mogessie et al. (1991), Ripley et …
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Platinum-group minerals (PGM) in the Freetown Complex ...
composed of generally troctolitic rocks which show cyclic units of igneous layering with layers ranging from 5 mm to 150 m in thickness (Wells, 1962). Troctolites occur at the base of a unit passing upwards through pyroxene troctolites, troctolitic gabbro, olivine gabbro, gabbro to leucogabbro and anorthosite at …
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Birch Lake (MRDS #10072944) CU, NI, PGE_PT, PGE_PD
Though limits of the deposit are not yet known, it may extend into parts of Sections 19, 30 and 31, T61N R11W and Sections 24, 25 and 36, T61N R12W. A part of the deposit appears to lie below Birch Lake, a 15- to 30-foot-deep reservoir which holds water for Minnesota Power's Kawishiwi Hydroelectric Station.
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Copper-nickel Mineralization in a Drill Core from the ...
The pyrrhotite-troilite-pentlandite assemblage is believed to have formed from an immiscible sulfide melt, probably associated with the troctolitic rocks. Most of it settled to the very porous base of the Duluth Complex, and to the other porous zones near xenoliths; small …
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Major Mines & Projects | Voisey's Bay Mine
The massive sulphide is composed of approximately 75 per cent pyrrhotite/troilite, 12 per cent pentlandite, 8 per cent chalcopyrite/cubanite and contains 5 per cent magnetite. The pyrrhotite is hexagonal and on average contains about 0.29 per cent nickel. …
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Duluth Complex and NorthMet Deposit | PolyMet Mining
Geology and Mineralogy Located in the Partridge River Intrusion of the Duluth Complex, the NorthMet deposit is a large disseminated sulfide deposit in heterogeneous troctolitic rocks associated with the 1.1 billion-year-old Mid-Continent Rift.
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LOVERINGITE AND BADDELEYITE IN LAVERS OF CHROMIAN …
pentlandite (white), and silicate (phlogopite and pargasite, dark gray) in chronian spinel. Maximum dimension of loveringite grain is ca. 35 pm. Iom,rrF'IcATroN AND ANALyTTcAL METHoDS In reflected light, loveringite is opaque, with a grey tone and a pinkish hue similar to ilmenite, from which it is distinguished quite easily by its isotropism ...
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AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES …
dioritic, and troctolitic [Emslie et al., 1994]. Exam-ples of Mesoproterozoic troctolitic intrusions found in this area include the Kiglapait Intrusion, the Hettasch Intrusion and the Newwark Island Intru-sion (Figure 1). The Nain Plutonic Suite invades the Nain-Churchill suture zone. The Voisey’s Bay Intrusion and the Mushuau Intrusion ...
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Sara Raic - ResearchGate
The troctolitic Bathtub intrusion (Duluth Complex, NE-Minnesota) hosts the sub-economic Cu-Ni-sulfide Babbitt deposit, which is characterized by disseminated sulfide ores (pentlandite, pyrrhotite ...
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Hydrothermal alteration and Cu–Ni–PGE mobilization in the ...
In the Neoarchean (~ 2.7 Ga) contact metamorphosed charnockitic footwall of the Mesoproterosoic (1.1 Ga) South Kawishiwi intrusion of the Duluth Complex, the primary metamorphic mineral assemblage and Cu–Ni–PGE sulfide mineralization is overprinted by an actinolite + chlorite + cummingtonite + prehnite + pumpellyite + quartz + calcite hydrothermal mineral assemblage along 2–3 cm thick veins.
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freegoldmaps.com
These Faults Formed During The Opening Of The Rift And Controlled Emplacement Of The Troctolitic And Late Intrusions.-91.68100 47.82972 0 5.850312281083992e-011 0 2090.934796680541 relativeToSeaFloor #m_ylw-pushpin1-91.68100,47.82972,0
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Contrasts between platinum group element contents and ...
(pyrrhotite, pentlandite and chalcopyrite) are similar to the sulfide mineralization in troctolitic series rocks. However, the sulfide assemblage is dominated by chalcopyrite in anorthositic rocks. The highest concentration of PGE's in anorthositic series rocks
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ARSENIC-RICH Cu-Ni-PGE MINERALIZATION IN WETLEGS, …
The restricted appearance in altered troctolitic rocks and underlying recrystallized footwall metasediments (ia Formation) suggest a deposition of arsenic-rich phases by late-stage hydrothermal fluids.
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Contrasts between platinum group element contents and ...
These textures and the sulfide assemblage (pyrrhotite, pentlandite and chalcopyrite) are similar to the sulfide mineralization in troctolitic series rocks. However, the sulfide assemblage is ...
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INTRUSION-RELATED DEPOSITS
INTRUSION-RELATED DEPOSITS ... generally hosted by gabbroic-troctolitic rocks (e.g., Sudbury ... pentlandite, chalcopyrite and Au. ALTERATION: None; however, associated sulphides may form gossans. DISTRIBUTION: Newfoundland: Layer plutons in central NL, such as the Red Cross
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Native iron (–platinum) ores from the Siberian Platform ...
Native iron (–platinum) ores from the Siberian Platform trap intrusions V. V. RYABOV* AND A. A. LAPKOVSKY Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Koptyug pr. 3, 630090,
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