Genèse des dépôts de Fe-Ti-P associés aux intrusions litées (exemples l intrusion mafique de Sept-Iles au Québec complexe de Duluth aux États-Unis)

Nabil, Hassan

doi:10.1522/17773284

Cited by 10 publications

(8 citation statements)

References 68 publications

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“…The temperatures are higher than greenschist grade metamorphism and are consistent with conditions of equilibrium upon cooling. The fO 2 is much higher than this reported from the Sept-Ile (FMQ −1 to 0 at 650 • C; [3,87]) and Skaergaard (FMQ −1.5 to 0 at >1000 • C; [88]) intrusions. The fO 2 is slightly higher that this reported for the Panzhihua intrusion (> FMQ +1.5 at >1000 • C; [77]).…”

contrasting

confidence: 57%

“…According to this calculation, the magmatic rocks likely contained 5.3 to 10.6 wt % fayalite, 33.6 wt % forsterite and 0.3 to 0.6 wt % SiO 2 was produced by fayalite destruction. This gives a forsterite number (Fo# = Mg/(Mg + Fe) molar) of about 0.82-0.90 (Fo [82][83][84][85][86][87][88][89][90] ). The serpentine-rich samples correspond to metamorphosed magnetite-forsterite-dominated rocks (ferrodunite).…”

Section: Metamorphismmentioning

confidence: 99%

“…In summary, the magmatic assemblage included magnetite and an olivine with elevated Mg-content (Fo [82][83][84][85][86][87][88][89][90] ). These pre-metamorphism rocks also contained < 1 to up to 5 vol % of apatite (Table 4).…”

Section: Metamorphismmentioning

confidence: 99%

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Origin of the Vanadiferous Serpentine–Magnetite Rocks of the Mt. Sorcerer Area, Lac Doré Layered Intrusion, Chibougamau, Québec

Mathieu

2019

Geosciences

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Magmatic processes dominate Fe–Ti–V mineralization and revealing these processes is essential for providing a scientific foundation for exploration models. This study focuses on the metamorphosed Neoarchean (ca. 2728 Ma) tholeiitic layered Lac Doré Complex (LDC) that is currently being explored for V. Contamination may play an important role in the evolution of the Fe–Ti–V-enriched layered zone (magnetitite, anorthosite, and gabbro mostly, and ultramafic rocks locally) of the LDC. This hypothesis is tested by performing a detailed chemical and petrological investigation of serpentine-magnetite-dominated rocks located in the Mt. Sorcerer area. The studied rocks have evolved (apatite-bearing, Fe-rich, Cr-Ni-Ti-poor) and primitive (Mg-rich, Si-poor) characteristics. Pre-metamorphism rocks contained olivine Fo82–90 (now serpentine) and magnetite. These rocks formed from a Si-depleted magma under high fO2 conditions (+1.8 to +3.0 relative to the fayalite-magnetite-quartz buffer; FMQ). The V-content of the magnetite varies due to reversals related to multiple injections of an evolved basaltic magma in the upper part of the LDC. The magma interacted with Fe-Mg-rich and Si-Ca-poor carbonate-facies iron formation and crystallized in the presence of oxidizing CO2-bearing fluids. Compositional layering is poorly defined due to a fast cooling rate. Consequently, the distribution of V is relatively homogeneous in the Fe–Mg-rich units of the Mt. Sorcerer area.

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contrasting

confidence: 57%

Section: Metamorphismmentioning

confidence: 99%

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Origin of the Vanadiferous Serpentine–Magnetite Rocks of the Mt. Sorcerer Area, Lac Doré Layered Intrusion, Chibougamau, Québec

Mathieu

2019

Geosciences

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“…The Rio Jacare body was metamorphized and the PGE are found as PGM in association with the magnetite (Sa et al, 2005). In Duluth an igneous assemblage of sulphides, pyrrhotite, pentlandite and chalcopyrite are present and PGE correlate with S suggesting a sulphide control of the elements (Nabil, 2003).…”

Section: Layered Intrusion Hosted Platinum-group Depositsmentioning

confidence: 99%

Distribution of platinum-group elements in the ebay claim, central part of the Bell River Complex, Matagami, Quebec /

Taborda¹

2010

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The Bell River Complex (BRC) is a mafic layered complex located 30 kilometers southeast of Matagami in northern Abitibi. The complex is divided into three parts: The East, the Central and the West. The Central part of the intrusion contains the Platinum Group Elements (PGE) occurrences Bwest, Dotcom and Ebay. This project is focused on the Ebay claim (property of Hinterland Metals Inc.) which is centered on the Elizabeth Bay and Opaoca River. The BRC around Ebay consists of layers of leucocratic and melanocratic metagabbros that are folded with an orientation that is predominantly E-W and dipping south 70-80 degrees. The leucocratic layers consist of a sequence of meta-leucogabbronorites, metaleucogabbros, meta-leucotroctolites and meta-anorthosites. The melanocratic layers consist of a sequence of meta-melanogabbros, meta-olivine-gabbronorites, meta-gabbronorites and meta-pyroxenites. The layered mafic complex is crosscut by sills, dykes and quartz veins associated with the Opaoca and Olga granitic plutons. The BRC is visibly and polymetamorphosed with regional metamorphism reaching greenschist to amphibolite faciès (Goutier, 2005) and contact VII My no-REDIST friends who I had not mention before, they motivated me to stand winter, some of them are Luis, Karla, Memo, Jacobo, Audrey, Juanito, Anita, Juan Cynthia and Jeannette, muchas gracias. Sandra, she gave me a new smile and has contributed with her love, support and affection. My family, they have built the person I have become, they always know how to overcome from the difficulties. Without them this could not be possible. A mi papa, mama y hermanos, muchas gracias por toda la ayuda que me han brindado, por aguantarme y por darme la posibilidad de estudiar, el esfuerzo de esta maestria también es de ustedes. Los Ilevo en el corazôn a cualquier lugar y en todo momento.

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“…Pt and Pd are concentrated in magnetitite layers, similar to the Rio Jacaré intrusion, in the Duluth Complex in Minnesota, with values for Birch Lake of 2.7 ppm Pt and 2.5 ppm Pd (Hauck et al, 1997;Nabil, 2003), in the Coldwell Complex in Canada, with values of 1.5 ppm Pd and 0.3 ppm Pt over 1.8 m (Barrie et al, 2002), and in the Stella intrusion of South Africa, with values of up to 7 ppm Pt and 7 ppm Pd (Maier et 344…”

Section: Comparison With Other Pge-enrichedmentioning

confidence: 99%

The Distribution of Base Metals and Platinum-Group Elements in Magnetititeand Its Host Rocks in the Rio Jacare Intrusion, Northeastern Brazil

et al. 2005

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Anomalously high Pt and Pd values have been found in three magnetite bodies in the Rio Jacaré intrusion of northeastern Brazil. The intrusion hosting these magnetite bodies consists predominantly of pyroxenite and gabbro. One magnetite body occurs in the Lower zone and two in the Upper zone of the intrusion. These bodies contain approximately 0.04 percent Ni, 0.1 percent Cu, 0.18 percent S, 1 ppb Ir, 3 ppb Rh, 160 ppb Pt, 120 ppb Pd, and 37 ppb Au. They are much richer in platinum-group elements (PGE) than the surrounding silicate rocks, and there are significant correlations among all of the PGE and between PGE and Ni. However the correlations between PGE and Au, Cu, and S are much weaker than correlations between Au, Cu, and S.In the magnetite bodies palladium-rich minerals, especially bismuthides and antimonides, are the most abundant platinum-group minerals (PGM). In most cases these occur with interstitial silicates or within silicate inclusions in magnetite and ilmenite grains and are associated with Co-bearing pentlandite and in a few cases with Co-Ni sulfarsenides and arsenides. Sperrylite (PtAs2) is the most abundant Pt mineral and is associated with silicates interstitial to magnetite and ilmenite grains and sometimes with Co-Ni arsenides. At sites where the igneous mafic minerals have been altered to amphiboles, sperrylite may be altered to Pt-Fe alloys. Other alloys present include Pd-Sn-Cu, Pt-Cu, Pt-Ni, and Pt-Au.It is suggested that Ni and PGE were concentrated in the magnetite bodies by the coprecipitation of a small quantity of sulfide with the magnetite. These PGE-bearing base metal sulfides subsequently exsolved PGM. The association of Pd minerals with base metal sulfides and the small variation in the Pt/Pd ratio (ca. 1.4) suggests that the PGE have not been extensively remobilized in the magnetitite. In contrast, the strong correlation between S, Cu, and Au suggests that, in addition to the redistribution of S, it is likely that Cu and Au were remobilized. It is not possible to say whether the redistribution of sulfur was due to late magmatic fluids dissolving S or the later metamorphic events.The association of PGE enrichment with magnetite layers in the Rio Jacaré intrusion contrasts with that of the Bushveld, Stillwater, Great Dyke, and Munni Munni Complexes. In these complexes PGE-enriched layers or reefs are found in the lower third of the complexes and the oxide associated with the reefs is chromite. Magnetite-bearing layers, which form from an evolved magma in the upper parts of the intrusions, are generally barren of PGE because, at the time of magnetite crystallization, the PGE had already precipitated either in sulfides or PGM. However in a number of intrusions (e.g., Rincon del Tigre, Skaergaard, Stella, and Rio Jacaré) the upper magnetite-bearing portion of the intrusion shows PGE enrichment. This enrichment is rarely associated with visible sulfides but suggests a possible new target for PGE exploration.

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Genèse des dépôts de Fe-Ti-P associés aux intrusions litées (exemples l intrusion mafique de Sept-Iles au Québec complexe de Duluth aux États-Unis)

Cited by 10 publications

References 68 publications

Origin of the Vanadiferous Serpentine–Magnetite Rocks of the Mt. Sorcerer Area, Lac Doré Layered Intrusion, Chibougamau, Québec

Origin of the Vanadiferous Serpentine–Magnetite Rocks of the Mt. Sorcerer Area, Lac Doré Layered Intrusion, Chibougamau, Québec

Distribution of platinum-group elements in the ebay claim, central part of the Bell River Complex, Matagami, Quebec /

The Distribution of Base Metals and Platinum-Group Elements in Magnetititeand Its Host Rocks in the Rio Jacare Intrusion, Northeastern Brazil

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