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Academic literature on the topic 'Mafic–ultramafic intrusions'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Mafic–ultramafic intrusions"

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Hart, Thomas Robert, and Carole Anne MacDonald. "Proterozoic and Archean geology of the Nipigon Embayment: implications for emplacement of the Mesoproterozoic Nipigon diabase sills and mafic to ultramafic intrusions." Canadian Journal of Earth Sciences 44, no. 8 (August 1, 2007): 1021–40. http://dx.doi.org/10.1139/e07-026.

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The Nipigon Embayment is underlain by Archean rocks of the English River, Wabigoon, and Quetico subprovinces, and intruded along the west side by late- to post-tectonic mafic to ultramafic intrusions. The early Mesoproterozoic ultramafic to felsic Badwater intrusion and felsic English Bay Complex are located in the northwest corner of the Nipigon Embayment. Three mafic to ultramafic intrusions, the Disraeli, Seagull, and Hele intrusions, are located south of Lake Nipigon, and the Kitto intrusion is located east of the lake. A number of mafic to ultramafic bodies (Jackfish (Island), Shillabeer, Kama Hill, Nipigon Bay) have only limited outcrops. The gabbroic Nipigon diabase sills intrude all other rocks in the Nipigon Embayment and generally have a consistent mineralogy and geochemistry, except for the Inspiration sill(s) and the McIntyre Sill. Geological and geophysical data suggest emplacement of the ultramafic intrusions by mechanisms similar to those controlling emplacement of the saucer-shaped diabase sills. These mechanisms are partially dependent on a series of pre-existing north-, northwest-, and northeast-trending faults formed prior to Keweenawan magmatism. The presence of sills, rather than dykes, indicates that the Nipigon Embayment was not extensional during the Keweenawan Midcontinent Rift, suggesting that the Nipigon Embayment is not a classic failed arm.
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Zi, Jian-Wei, Birger Rasmussen, Janet R. Muhling, Wolfgang D. Maier, and Ian R. Fletcher. "U-Pb monazite ages of the Kabanga mafic-ultramafic intrusions and contact aureoles, central Africa: Geochronological and tectonic implications." GSA Bulletin 131, no. 11-12 (April 15, 2019): 1857–70. http://dx.doi.org/10.1130/b35142.1.

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AbstractMafic-ultramafic rocks of the Kabanga-Musongati alignment in the East African nickel belt occur as Bushveld-type layered intrusions emplaced in metasedimentary sequences. The age of the mafic-ultramafic intrusions remains poorly constrained, though they are regarded to be part of ca. 1375 Ma bimodal magmatism dominated by voluminous S-type granites. In this study, we investigated igneous monazite and zircon from a differentiated layered intrusion and metamorphic monazite from the contact aureole. The monazite shows contrasting crystal morphology, chemical composition, and U-Pb ages. Monazite that formed by contact metamorphism in response to emplacement of mafic-ultramafic melts is characterized by extremely high Th and U and yielded a weighted mean 207Pb/206Pb age of 1402 ± 9 Ma, which is in agreement with dates from the igneous monazite and zircon. The ages indicate that the intrusion of ultramafic melts was substantially earlier (by ∼25 m.y., 95% confidence) than the prevailing S-type granites, calling for a reappraisal of the previously suggested model of coeval, bimodal magmatism. Monazite in the metapelitic rocks also records two younger growth events at ca. 1375 Ma and ca. 990 Ma, coeval with metamorphism during emplacement of S-type granites and tin-bearing granites, respectively. In conjunction with available geologic evidence, we propose that the Kabanga-Musongati mafic-ultramafic intrusions likely heralded a structurally controlled thermal anomaly related to Nuna breakup, which culminated during the ca. 1375 Ma Kibaran event, manifested as extensive intracrustal melting in the adjoining Karagwe-Ankole belt, producing voluminous S-type granites. The Grenvillian-aged (ca. 990 Ma) tin-bearing granite and related Sn mineralization appear to be the far-field record of tectonothermal events associated with collision along the Irumide belt during Rodinia assembly. Since monazite is a ubiquitous trace phase in pelitic sedimentary rocks, in contact aureoles of mafic-ultramafic intrusions, and in regional metamorphic belts, our study highlights the potential of using metamorphic monazite to determine ages of mafic-ultramafic intrusions, and to reconstruct postemplacement metamorphic history of the host terranes.
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Li, Ai, Jian Wang, and Yue Song. "Petrology, mineral chemistry, and geochemistry of Late Triassic Ni–Cu ore-bearing mafic–ultramafic intrusions, Hongqiling, northeastern China: petrogenesis and tectonic implications." Canadian Journal of Earth Sciences 56, no. 2 (February 2019): 111–28. http://dx.doi.org/10.1139/cjes-2018-0014.

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The Hongqiling magmatic Ni–Cu sulfide deposit, situated on the southern margin of the eastern Central Asian Orogenic Belt (CAOB), is composed of over 30 mafic–ultramafic intrusions. These ore-bearing intrusions are composed mainly of harzburgite, lherzolite, websterite, orthopyroxenite, and norite (gabbro). The constituent minerals are olivine, diopside, bronzite, calcic-hornblende, plagioclase, and spinel with orthopyroxene as a dominant mineral in these intrusions. These ore-bearing intrusions are not Alaskan-type complexes. Spinel and clinopyroxene both exhibit different chemical compositions from those in the Alaskan-type complexes. The rocks that make up the intrusions have high contents of MgO (average value = 25.20 wt.%) and low TiO2 (average value = 0.58 wt.%). The high MgO contents of the minerals and the high Mg# (71) of the calculated melt in equilibrium with olivine demonstrate that the parental magma of the Hongqiling mafic–ultramafic intrusions was a high-Mg tholeiitic magma. The Hongqiling ore-bearing mafic–ultramafic intrusions and the calculated “trapped liquids” for the olivine-orthopyroxene cumulate rocks are all enriched in large-ion lithophile elements and depleted in high field strength elements. The Ce/Pb, Ta/La, Th/Yb, and (La/Sm)PM values and the depletion of Nb and Ta suggest that the magma experienced crustal contamination. The Hongqiling ore-bearing intrusions display many similarities with mafic–ultramafic intrusions that formed in a post-collisional extensional environment in the western CAOB (e.g., Huangshanxi). Common features include their whole-rock compositions and mineral chemistry. Combined with the evolutionary history of the eastern segment of the CAOB, we believe that the Late Triassic Hongqiling mafic–ultramafic intrusions formed in a post-collisional extensional environment.
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Zhao, Xinyun, Libo Hao, Qiaoqiao Wei, Qingqing Liu, Jian Zhou, Xueqiu Wang, Jilong Lu, Yuyan Zhao, and Chengyou Ma. "Origin of Late Triassic mafic–ultramafic intrusions in the Hongqiling Ni–Cu sulfide deposit, Northeast China: evidence from trace element and Sr–Nd isotope geochemistry." Canadian Journal of Earth Sciences 55, no. 12 (December 2018): 1312–23. http://dx.doi.org/10.1139/cjes-2018-0041.

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There are many Late Triassic mafic–ultramafic intrusions in the Hongqiling magmatic Ni–Cu sulfide deposit, Northeast China. Research on magma evolution leading to formation of these mafic–ultramafic intrusions is of great significance for understanding the mantle beneath Northeast China and associated Ni–Cu mineralization. A trace element study of the No. 1, 3, and 7 intrusions in the Hongqiling deposit reveals that these mafic–ultramafic intrusions are characterized by enrichment of incompatible elements, which however cannot be interpreted by subduction modification. Furthermore, model of batch partial melting of depleted mantle accompanied by upper crustal contamination can simulate the trace element patterns of these mafic–ultramafic intrusions, but partial melting of depleted mantle accompanied by lower crustal contamination model cannot work. In addition, Sr–Nd isotopic compositions of the Hongqiling No. 1, 3, and 7 intrusions also indicate that crustal contamination could have occurred mainly during the magma ascent. Consequently, a possible scenario for the magma evolution is that the primary mafic–ultramafic magma was derived from batch partial melting of a depleted mantle, and then contaminated by Cambrian–Ordovician metamorphic rocks of the Hulan Group during ascent. We conclude that the mantle source contained no significant crustal component in the Late Triassic and was also independent of substantial contribution from subducted material, and therefore the Mesozoic large-scale lithospheric delamination beneath eastern China may happen after a period of time of the Late Triassic.
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Guice, George L., Michael R. Ackerson, Robert M. Holder, Freya R. George, Joseph F. Browning-Hanson, Jerry L. Burgess, Dionysis I. Foustoukos, Naomi A. Becker, Wendy R. Nelson, and Daniel R. Viete. "Suprasubduction zone ophiolite fragments in the central Appalachian orogen: Evidence for mantle and Moho in the Baltimore Mafic Complex (Maryland, USA)." Geosphere 17, no. 2 (February 5, 2021): 561–81. http://dx.doi.org/10.1130/ges02289.1.

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Abstract Suprasubduction zone (SSZ) ophiolites of the northern Appalachians (eastern North America) have provided key constraints on the fundamental tectonic processes responsible for the evolution of the Appalachian orogen. The central and southern Appalachians, which extend from southern New York to Alabama (USA), also contain numerous ultramafic-mafic bodies that have been interpreted as ophiolite fragments; however, this interpretation is a matter of debate, with the origin(s) of such occurrences also attributed to layered intrusions. These disparate proposed origins, alongside the range of possible magmatic affinities, have varied potential implications for the magmatic and tectonic evolution of the central and southern Appalachian orogen and its relationship with the northern Appalachian orogen. We present the results of field observations, petrography, bulk-rock geochemistry, and spinel mineral chemistry for ultramafic portions of the Baltimore Mafic Complex, which refers to a series of ultramafic-mafic bodies that are discontinuously exposed in Maryland and southern Pennsylvania (USA). Our data indicate that the Baltimore Mafic Complex comprises SSZ ophiolite fragments. The Soldiers Delight Ultramafite displays geochemical characteristics—including highly depleted bulk-rock trace element patterns and high Cr# of spinel—characteristic of subduction-related mantle peridotites and serpentinites. The Hollofield Ultramafite likely represents the “layered ultramafics” that form the Moho. Interpretation of the Baltimore Mafic Complex as an Iapetus Ocean–derived SSZ ophiolite in the central Appalachian orogen raises the possibility that a broadly coeval suite of ophiolites is preserved along thousands of kilometers of orogenic strike.
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Hart, Thomas, Adam Richardson, Carole Anne MacDonald, and Pete Hollings. "Geochemistry of the Mesoproterozoic intrusive rocks of the Nipigon Embayment, northwestern Ontario: evaluating the earliest phases of rift development." Canadian Journal of Earth Sciences 44, no. 8 (August 1, 2007): 1087–110. http://dx.doi.org/10.1139/e06-127.

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The intrusive rocks of the Nipigon Embayment comprise a series of four mafic to ultramafic intrusions and a number of laterally extensive diabase sills that are among the oldest expression of the ~1.1 Ga Mesoproterozoic Mid-continent Rift. New geochemical data indicate that the sills can be subdivided into five distinct groups: three mafic sills (Nipigon, Inspiration, and McIntyre diabase sills), with the Nipigon sills forming the bulk of the outcrop, and two spatially restricted ultramafic to mafic sills (Jackfish and Shillabeer sills). The latter mafic sills are typically massive, medium-grained, intergranular textured gabbros ranging in thickness from a few metres to more than 250 m. Two of the ultramafic intrusions included in this study (Disraeli and Hele) consist of a core of pyroxene peridotite with olivine gabbro along the margins. The geochemical characteristics of the ultramafic intrusions and diabase sills are consistent with plume-derived melts that have undergone subsequent fractionation and been contaminated by continental crust, likely at depth, but a few samples from the Hele and Disraeli intrusions have the characteristics of primary, uncontaminated melts that have been rapidly transported through the lithosphere with little interaction with wall rocks. The field and geochemical characteristics of the intrusions and sills are consistent with the ultramafic intrusions having been emplaced before the diabase sills and indicate that the history of the Midcontinent Rift is more complex and protracted than previously recognized.
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Blanchard, J. A., R. E. Ernst, and C. Samson. "Gravity and magnetic modelling of layered mafic–ultramafic intrusions in large igneous province plume centre regions: case studies from the 1.27 Ga Mackenzie, 1.38 Ga Kunene–Kibaran, 0.06 Ga Deccan, and 0.13–0.08 Ga High Arctic events." Canadian Journal of Earth Sciences 54, no. 3 (March 2017): 290–310. http://dx.doi.org/10.1139/cjes-2016-0132.

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Gravity and magnetic data from the global EGM2008 and EMAG2 datasets are used to identify geophysical anomalies in large igneous province (LIP) plume centre regions with the goal of characterizing mafic–ultramafic intrusions linked to those LIPs. Geophysical anomalies within 18 LIPs distributed globally are investigated. Four of these LIPs are selected for detailed modelling: the 1.27 Ga Mackenzie, 1.38 Ga Kunene–Kibaran, 0.06 Ga Deccan, and 0.13–0.08 Ga High Arctic LIPs. We recognize three spatial distribution types for intrusions in plume centre regions. These are (1) intrusions emplaced along a circular fault system that circumscribes the plume centre, (2) intrusions emplaced along linear rifts that, in some cases, converge towards the plume centre, and (3) single or unclassified intrusions. Modelling supports that the geophysical anomalies associated with these LIPs tend to be produced by large (radius >30 km) and deep-seated crustal intrusions, with densities consistent with mafic–ultramafic rock and magnetic susceptibilities consistent with serpentinized ultramafic rock, except within the Deccan where intrusions are smaller, mainly mafic in composition, and positioned at shallower depths in the crust.
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Smyk, Mark C., and James M. Franklin. "A synopsis of mineral deposits in the Archean and Proterozoic rocks of the Lake Nipigon Region, Thunder Bay District, Ontario." Canadian Journal of Earth Sciences 44, no. 8 (August 1, 2007): 1041–53. http://dx.doi.org/10.1139/e07-013.

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A variety of metallic and non-metallic mineral deposit types occur within Archean and Proterozoic rocks in the area encompassing the Lake Nipigon Region Geoscience Initiative. Archean deposit types include Algoma-type banded iron formation-hosted iron (e.g., Lake Nipigon iron range); volcanogenic massive sulphide copper–zinc (e.g., Onaman–Tashota belt); ultramafic intrusion-hosted chromium (e.g., Puddy–Chrome lakes); mafic to ultramafic intrusion-hosted copper–nickel – platinum group element (PGE) (e.g., Lac des Iles); and pegmatite-hosted deposits of rare metals (Li, Ta, Be), uranium, and molybdenum (e.g., Georgia Lake field, Black Sturgeon Lake, and Anderson Lake, respectively). Mesothermal lode gold deposits are prominent in the Beardmore–Geraldton camp. Superior-type iron formation occurs in Paleoproterozoic Gunflint Formation. "Red-bed" copper occurs in Mesoproterozoic Midcontinent Rift-related Osler Group volcanic and interflow sedimentary rocks. Native copper and copper sulphides occur in Mesoproterozoic Sibley Group sedimentary rocks, adjacent to ultramafic intrusions. These mafic to ultramafic intrusions, associated with Midcontinent Rift magmatism, host copper–nickel–PGE deposits (e.g., Seagull, Great Lakes Nickel). Silver-bearing veins occur in Paleoproterozoic Animikie Group sedimentary rocks in proximity to Midcontinent Rift-related mafic intrusions (e.g., Silver Islet, Silver Mountain). Lead–zinc–barite veins, uranium-bearing veins, and amethyst vein and replacement-type deposits may be cogenetic and formed at or near the unconformity between Sibley Group basal sandstone and underlying Archean granitic basement (e.g., Dorion, Black Sturgeon Lake, McTavish Township). The hydrothermal systems that produced all of these veins were probably driven by heat associated with Midcontinent rifting. Many occur in structures related to rift-bounding faults. Iron oxide – copper–gold deposits may occur near the English Bay intrusion.
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Makkonen, Hannu V., and Pekka Tuisku. "Geology and crystallization conditions of the Särkiniemiintrusion and related nickel-copper ore, central Finland – implications for depth of emplacement of 1.88 Ga nickel-bearing intrusions." Bulletin of the Geological Society of Finland 92, no. 2 (December 15, 2020): 111–30. http://dx.doi.org/10.17741/bgsf/92.2.003.

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Several Ni-Cu deposits occur within the Kotalahti area, central Finland, in proximity to an Archaean gneiss dome surrounded by a Palaeoproterozoic craton-margin supracrustal sequence comprising quartzites, limestones, calc-silicate rocks, black schists and banded diopside amphibolites. The geology of the area and age of the Ni-bearing intrusions (1.88 Ga) are similar to the Thompson Ni belt in the Canadian Trans-Hudson Orogen. The small mafic-ultramafic and Ni-Cu -bearing Särkiniemi intrusion, closely associated with the Archaean basement core of the Kotalahti Dome, is composed of a western peridotite and eastern gabbro body, both of which are mineralized. The eastern gabbro has a contact aureole several meters thick, consisting of orthopyroxene +/- cordierite bearing hornfels between the intrusion and the migmatites. Geochemically, the Särkiniemi intrusion shares many features in common with other Svecofennian mafic-ultramafic intrusions, including crustal contamination and nickel depletion. The related Ni-Cu deposit has a low Ni/Co value (15) and low nickel content in the sulphide fraction (2.8 wt.%), together with a low estimated magma/sulphide ratio of around 170. Svecofennian 1.88 Ga mafic-ultramafic intrusions occur in terrains of variable metamorphic grade (from low-amphibolite to granulite facies) and are likely to represent emplacement at different crustal depths. Multi-equilibrium thermobarometry indicates that the contact aureole at Särkiniemi reached equilibrium at pressures of 4.5–6 kbar (15–20 km depth) and temperatures of 600–670 °C. Combined with the results of earlier research on the Svecofennian intrusions, this study indicates that a depth of 15–20 km crustal level was favourable, along with other critical factors, for nickel sulfide deposition at 1.88 Ga.
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Cao, Yonghua, Christina Yan Wang, and Bo Wei. "Magma oxygen fugacity of mafic-ultramafic intrusions in convergent margin settings: Insights for the role of magma oxidation states on magmatic Ni-Cu sulfide mineralization." American Mineralogist 105, no. 12 (December 1, 2020): 1841–56. http://dx.doi.org/10.2138/am-2020-7351.

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Abstract Oxygen fugacities (fO2) of mantle-derived mafic magmas have important controls on the sulfur status and solubility of the magmas, which are key factors to the formation of magmatic Ni-Cu sulfide deposits, particularly those in convergent margin settings. To investigate the fO2 of mafic magmas related to Ni-Cu sulfide deposits in convergent margin settings, we obtained the magma fO2 of several Ni-Cu sulfide-bearing mafic-ultramafic intrusions in the Central Asian Orogenic Belt (CAOB), North China, based on the olivine-spinel oxygen barometer and the modeling of V partitioning between olivine and melt. We also calculated the mantle fO2 on the basis of V/Sc ratios of primary magmas of these intrusions. Ni-Cu sulfide-bearing mafic-ultramafic intrusions in the CAOB include arc-related Silurian-Carboniferous ones and post-collisional Permian-Triassic ones. Arc-related intrusions formed before the closure of the paleo-Asian ocean and include the Jinbulake, Heishan, Kuwei, and Erbutu intrusions. Post-collisional intrusions were emplaced in extensional settings after the closure of the paleo-Asian ocean and include the Kalatongke, Baixintan, Huangshandong, Huangshan, Poyi, Poshi, Tulaergen, and Hongqiling No. 7 intrusions. It is clear that the magma fO2 values of all these intrusions in both settings range mostly from FMQ+0.5 (FMQ means fayalite-magnetite-quartz oxygen buffer) to FMQ+3 and are generally elevated with the fractionation of magmas, much higher than that of MORBs (FMQ-1 to FMQ+0.5). However, the mantle fO2 values of these intrusions vary from ~FMQ to ~FMQ+1.0, just slightly higher than that of mid-ocean ridge basalts (MORBs) (≤FMQ). This slight difference is interpreted as the intrusions in the CAOB may have been derived from the metasomatized mantle wedges where only minor slab-derived, oxidized components were involved. Therefore, the high-magma fO2 values of most Ni-Cu sulfide-bearing mafic-ultramafic intrusions in the CAOB were attributed to the fractionation of magmas derived from the slightly oxidized metasomatized mantle. In addition, the intrusions that host economic Ni-Cu sulfide deposits in the CAOB usually have magma fO2 of >FMQ+1.0 and sulfides with mantle-like δ34S values (–1.0 to +1.1‰), indicating that the oxidized mafic magmas may be able to dissolve enough mantle-derived sulfur to form economic Ni-Cu sulfide deposits. Oxidized mafic magmas derived from metasomatized mantle sources may be an important feature of major orogenic belts.
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Dissertations / Theses on the topic "Mafic–ultramafic intrusions"

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Gao, Jianfeng, and 高剑峰. "Petrogenesis of permian sulfide-bearing mafic-ultramafic intrusions insoutheast Chinese Altay and east Tianshan, NW China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49617801.

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The Central Asia Orogenic Belt is one of the largest accretionary orogenic belts in the world. In this belt, many sulfide‐bearing mafic‐ultramafic intrusions occur along faults, including the Kalatongke complex in southeast Chinese Altay and the Huangshandong intrusion in east Tianshan. The Kalatongke complex is a composite body including ~308Ma dioritic intrusion and 287Ma sulfide‐bearing mafic intrusion. The dioritic intrusion consists of biotite‐hornblende gabbro, diorite and quartz diorite. This intrusion was formed from a mixture of an evolved mantle‐derived magma and a crust‐derived adakitic magma combined with fractional crystallization of clinopyroxene, amphibole and plagioclase. The mafic intrusion is dominantly made up of norite in which sulfide ores, including disseminated, massive Ni‐Cu and massive Cu‐rich ores, are hosted. This intrusion was formed from two different pulses of basaltic magmas that had different magma evolution histories. The early magma pulse reached sulfide‐saturation due to minor crustal contamination and a small amount of sulfide (<0.03%) was removed before the emplacement. The evolved magmas then entered a shallow magma chamber and assimilated crustal materials to attain sulfide‐saturation again. Sulfide liquids segregated from the magma to form massive Ni‐Cu and massive Cu‐rich ores through further fractionation and residual silicate melts formed norites. A second pulse of magma underwent removal of <0.02% sulfides with stronger crustal contamination, and re‐attained S‐saturation during the emplacement and became a phenocryst‐laden magma. This magma then intruded the earlier formed massive sulfide ores and norites, forming the disseminated sulfide ores. The Permian Huangshandong mafic‐ultramafic intrusion hosts the largest magmatic sulfide deposit in east Tianshan. It consists of a layered unit of lherzolite, gabbro and diorite and a massive unit of olivine gabbronorite and gabbronorite. Both units formed from siliceous high magnesium basaltic (SHMB) magmas derived from a hydrous, depleted mantle source. The two units of the Huangshandong intrusion formed from magmas that have undergone different processes through the evolution of the magma plumbing system. The early magma pulse gained sulfur‐saturation before the emplacement and small amounts of sulfide (<0.03%) were removed to result in a PGE‐depleted, high‐Mg magma. This magma achieved sulfide‐saturation again in a staging magma chamber through crustal contamination and fractional crystallization of olivine and Cr‐spinel (an AFC process) to form the layered unit. A second magma pulse underwent fractionation of more olivine +/‐ Cr‐spinel but less sulfide (<0.003%) removal before the emplacement and became evolved, PEG‐undepleted and low‐Mg before the injection into the magma chamber. Mixing of the two magmas triggered sulfide‐saturation to form sulfide ores with variable PGE, Ni and Cu compositions. The study suggests that SHMB‐like magmatism, produced by melting of depleted and hydrous mantle source, may be an important feature of orogenic belts. Mafic‐ultramafic intrusions formed from SHMB‐like magmas may host economic sulfide deposits, particularly sulfide Ni‐Cu sulfide deposits.
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Yang, Shenghong, and 杨胜洪. "The permian Pobei mafic-ultramafic intrusion (NE Tarim, NW China) and associated sulfide mineralization." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45874219.

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Summers, Michael Alan. "The geochemistry and petrogenesis of palaeoproterozoic mafic and ultramafic intrusions of the central Laramie mountains, Wyoming Archaean Province, USA." Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310469.

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Wang, Yan. "Petrogenesis of permian flood basalts and mafic-ultramafic intrusions in the Jinping (SW China) and Song Da (Northern Vietnam) districts." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37758743.

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Wang, Yan, and 王焰. "Petrogenesis of permian flood basalts and mafic-ultramafic intrusions in the Jinping (SW China) and Song Da (Northern Vietnam) districts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37758743.

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Pettigrew, Neil Thomas. "Copper-nickel-platinum group element mineralization and petrogenesis of mafic-ultramafic intrusions in the western Quetico and Wabigoon Subprovinces, northwestern Ontario, Canada." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26743.

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This project focused on Cu-Ni-PGE mineralization and petrogenesis of mafic-ultramafic intrusions in the western Quetico and Wabigoon Subprovinces of the Superior Province. Two intrusions were singled out for detailed study: the Legris Lake Complex, part of circular series of mafic-ultramafic complexes, which includes the Lac des Iles Complex, located in the Wabigoon Subprovince, and the Samuels Lake Intrusion, part of the Quetico Intrusions, located in the Quetico Subprovince. Legris Lake complex. The Legris Lake Complex is a northeast-trending 7.3 by 3.5 kilometre mafic-ultramafic intrusive complex. It is part of a circular series of mafic-ultramafic complexes, the most notable of which is the Lac des Iles Complex, which is host to Canada's only palladium mine. The Legris Lake Complex consists of mostly gabbroic rocks, but also contains lithologies ranging from anorthosite to wehrlite, and, variety of igneous breccias. The gabbroic rocks vary from melanogabbro to porphyritic leucogabbro. Medium grained, massive, biotite-rich leucogabbro is the predominant exposed variety and probably caps the complex. Samuels Lake intrusion. The Samuels Lake intrusion, ca 2688 +6/-5 Ma, located in the centre of the Quetico Subprovince possesses a northeast-southwest elliptical form (500 m by 250 m) and displays rough concentric zoning with a wehrlite core grading into clinopyroxenite border zone, which has been intruded by later homblendite. Olivine-rich rocks commonly contain blebs of pyrrhotite + chalcopyrite + pentlandite with anomalous PGE values, ranging from 50 to 300 ppb, whereas the clinopyroxenite border zone contains disseminated to blebby PGE-rich Cu-sulphide mineralization. (Abstract shortened by UMI.)
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Butak, Kevin Clifford. "Multi-Scale Magnetic Stratification of an Ultramafic-Mafic Complex: Example of the Great Dyke of Zimbabwe and Implications for Magmatic Differentiation." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/726.

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Layered mafic intrusions represent an important aspect of magmatism on earth and have occurred from Archean to present times. Literature on the geochemistry and petrology of these intrusions abounds but their physical properties, which could provide significant constraints on their formation, have seldom been investigated. Classic petrological methods such as whole-rock geochemistry, textural analysis and mineral chemistry have been applied to several intrusions of various ages. Most of these methods are relatively expensive or time intensive which limits high resolution studies. On the contrary, magnetic methods are typically inexpensive and fast and have been successfully applied to various occurrences of mafic rocks. In this study, several magnetic methods have been applied to a 600 m-long continuous borehole core drilled through one of the world's largest layered mafic intrusion, the Great Dyke of Zimbabwe. The main goal of this study is to constrain the magmatic history of the intrusion. More specifically, it is important to determine if the intrusion functioned as an open system, characterized by multiple magma pulses, or as a closed system, undergoing differentiation after a single magmatic pulse. The magnetic methods have also been validated by other independent approaches including image analysis, and electron microprobe. This study demonstrates that magnetic methods can be used to rapidly obtain critical information on the internal structure of this type of intrusion before applying more costly chemical analyses. The main scientific result of this study is to document the closed system nature of the Great Dyke of Zimbabwe, at least throughout the sequence investigated.
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Collins, Patrick G. "A petrographic and geochemical characterization and the evaluation of the exploration potential for nickel sulfides in several mafic-ultramafic intrusive complexes in Newfoundland /." 2007. http://collections.mun.ca/u?/theses,57846.

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Books on the topic "Mafic–ultramafic intrusions"

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Himmelberg, Glen R. Characteristics and petrogenesis of Alaskan-type ultramafic-mafic intrusions, southeastern Alaska. Washington: U.S. G.P.O., 1995.

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Su, Ben-Xun. Mafic-ultramafic intrusions in Beishan and Eastern Tianshan at southern CAOB: Petrogenesis, mineralization and tectonic implication. Berlin: Springer, 2014.

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Su, Ben-Xun. Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6.

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Summers, Michael Alan. The geochemistry and petrogenesis of palaeoproterozoic mafic and ultramafic intrusions of the central Laramie Mountains, Wyoming Archaean Province, USA. Portsmouth: University of Portsmouth, Dept. of Geology, 1997.

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Su, Ben-Xun. Mafic-Ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication. Springer Berlin / Heidelberg, 2016.

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Geology of the western Musgrave Block, central Australia, with particular reference to the mafic-ultramafic Giles Complex. Canberra: Australian Govt. Pub. Service, 1996.

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M, Hoatson D., ed. Petrology and platinum-group-element geochemistry of Archaean layered mafic-ultramafic intrusions, west Pilbara Block, Western Australia. Canberra: Australian Government Pub. Service, 1992.

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Su, Ben-Xun. Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication. Springer, 2014.

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N, Annells R., ed. The Rincón del Tigre Igneous Complex, a major layered ultramafic-mafic intrusion of Proterozoic age in the Precambrian shield of eastern Bolivia. London: H.M.S.O., 1986.

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N, Annells R., British Geological Survey, and Natural Environment Research Council, eds. The Rincon del Tigre igneous complex: A major layered ultramafic-mafic intrusion of proterozic age in the precanbrian shield of Eastern Bolivia. London: H.M.S.O., 1986.

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Book chapters on the topic "Mafic–ultramafic intrusions"

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Gongalsky, Bronislav, and Nadezhda Krivolutskaya. "Other Mafic-Ultramafic Intrusions of the Chiney Intrusive Complex." In Modern Approaches in Solid Earth Sciences, 243–54. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-03559-4_9.

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O’Driscoll, Brian, Brian O’Driscoll, Eric C. Ferré, Carl T. E. Stevenson, and Craig Magee. "The Significance of Magnetic Fabric in Layered Mafic-Ultramafic Intrusions." In Springer Geology, 295–329. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9652-1_7.

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Fletcher, T. A. "Nickel-Copper and Precious Metal Mineralisation in the Caledonian Mafic and Ultramafic Intrusions of North-East Scotland." In Geo-Platinum 87, 163–64. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1353-0_16.

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Chai, F., Z. Zhang, J. W. Mao, L. Dong, H. Wu, and X. Mo. "Geology, petrology and geochemistry of the Baishiquan Cu-Ni-bearing mafic-ultramafic intrusions in Xinjiang, NW China." In Mineral Deposit Research: Meeting the Global Challenge, 1293–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_329.

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Su, Ben-Xun. "Introduction." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_1.

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Su, Ben-Xun. "Concluding Remarks." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 209–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_10.

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Su, Ben-Xun. "Regional Geology." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_2.

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Su, Ben-Xun. "Analytical Methods." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 21–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_3.

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Su, Ben-Xun. "Petrology and Mineralogy." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 25–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_4.

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Su, Ben-Xun. "Zircon U–Pb Geochronlogy and Hf–O Isotopes." In Mafic-ultramafic Intrusions in Beishan and Eastern Tianshan at Southern CAOB: Petrogenesis, Mineralization and Tectonic Implication, 69–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54262-6_5.

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Conference papers on the topic "Mafic–ultramafic intrusions"

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R.M., Latypov. "Testing of an ‘amalgamated sill’ hypothesis for the origin of mafic-ultramafic layered intrusions." In Project KO5125 ARLIN Arctic Layered Intrusions as a Source of Critical Metals for Green Economy European Neighbourhood Instrument Cross-Border Cooperation Programme Kolarctic 2014-2020. GI KSC RAS, 2021. http://dx.doi.org/10.31241/arlin.2021.002.

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V., Järvinen, and Heinonen J. S. "Geology of the Precambrian mafic-ultramafic Näränkävaara intrusion – Review of recent results." In Project KO5125 ARLIN Arctic Layered Intrusions as a Source of Critical Metals for Green Economy European Neighbourhood Instrument Cross-Border Cooperation Programme Kolarctic 2014-2020. GI KSC RAS, 2021. http://dx.doi.org/10.31241/arlin.2021.017.

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M. A., Aaltonen, Beier C., Abersteiner A., and Heinonen A. "Chromite as a lithochemical tracer mineral in Finnish mafic-ultramafic host lithologies." In Project KO5125 ARLIN Arctic Layered Intrusions as a Source of Critical Metals for Green Economy European Neighbourhood Instrument Cross-Border Cooperation Programme Kolarctic 2014-2020. GI KSC RAS, 2021. http://dx.doi.org/10.31241/arlin.2021.018.

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Wall, Corey, James Scoates, Nichole Moerhuis, and Graham Nixon. "Construction rates of ultramafic-mafic intrusions in the Earth’s crust from U-Pb zircon geochronology." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.13169.

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Portes Ramos, Lucas, Marcelo Leão-Santos, Yaoguo Li, and Eduardo Cavalcanti Campos. "Magnetic and radiometric signatures applied to exploration of vermiculite mineralized mafic-ultramafic intrusions in Central Brazil." In First International Meeting for Applied Geoscience & Energy. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/segam2021-3594875.1.

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Zi, Jian-Wei, Birger Rasmussen, Janet Muhling, Wolfgang Maier, and Ian R. Fletcher. "Dating Mafic-Ultramafic Intrusions by Monazite in Hornfels: The Kabanga Instrusions in the Eastern African Nickel Belt." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3225.

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"Magnetic and radiometric signatures of Creoulos and Córrego da Lavrinha tonian granitic intrusions and Anicuns-Santa Bárbara mafic-ultramafic Suite (Córrego Seco Body) in Anicuns, Goiás, Brazil." In International Congress of the Brazilian Geophysical Society&Expogef. Brazilian Geophysical Society, 2021. http://dx.doi.org/10.22564/17cisbgf2021.206.

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Easton, R. Michael, Mark Puumala, Robert Cundari, Dorothy Campbell, Desmond R. B. Rainsford, and Riku Metseranta. "NEW AIRBORNE GEOPHYSICAL DATA FOR THE LAKE SUPERIOR REGION OF NORTHWESTERN ONTARIO: A NEW TOOL FOR THE IDENTIFICATION OF NEOARCHEAN TO MESOPROTEROZOIC STRUCTURES AND ASSOCIATED MAFIC-ULTRAMAFIC INTRUSIONS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283830.

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Kerrigan, Ryan J. "THE ULTRAMAFIC BODIES OF SOUTHEASTERN PENNSYLVANIA: POSSIBLE DISMEMBERED LAYERED MAFIC INTRUSION." In 68th Annual GSA Southeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019se-326806.

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Chen, Lie-Meng, Xie-Yan Song, Rui-Zhong Hu, Song-Yue Yu, Jun-Nian Yi, and Jie-Hua Yang. "Petrogenesis of the Xiarihamu Mafic-Ultramafic Intrusion, NW China: Evidence from Mg-Sr-Nd Isotopes." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.388.

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Reports on the topic "Mafic–ultramafic intrusions"

1

Sappin, A. A., and M G Houlé. The composition of magnetite in Archean mafic-ultramafic intrusions within the Superior Province. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326896.

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Sappin, A.-A., M. G. Houlé, C. M. Lesher, R. T. Metsaranta, and V. J. McNicoll. Regional characterization of mafic-ultramafic intrusions in the Oxford-Stull and Uchi domains, Superior Province, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296680.

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Houlé, M. G., J. Goutier, A.-A. Sappin, and V. J. McNicoll. Regional characterization of ultramafic to mafic intrusions in the La Grande Rivière and Eastmain domains, Superior Province, Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296684.

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Hulbert, L. J. A geochemical investigation of mafic-ultramafic intrusions for metallogenic pathfinder elements in the La Ronge-Lynn Lake greenstone belt: an overview. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205418.

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Sappin, A. A., and M G Houlé. Magnetite composition as petrogenetic and prospectivity indicator for FE-TI-V-P mineralization in Archean mafic-ultramafic intrusions within the Superior Province, Ontario and Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2021. http://dx.doi.org/10.4095/327839.

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Sappin, A. A., M. G. Houlé, and C. M. Lesher. Petrography and mineral chemistry of the mafic to ultramafic Max, Wabassi Main, Wabassi South, and Oxtoby Lake intrusions in the Miminiska-Fort Hope greenstone belt, Superior Province, Northern Ontario (Canada). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/299246.

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Harris, L. B., P. Adiban, and E. Gloaguen. The role of enigmatic deep crustal and upper mantle structures on Au and magmatic Ni-Cu-PGE-Cr mineralization in the Superior Province. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328984.

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Aeromagnetic and ground gravity data for the Canadian Superior Province, filtered to extract long wavelength components and converted to pseudo-gravity, highlight deep, N-S trending regional-scale, rectilinear faults and margins to discrete, competent mafic or felsic granulite blocks (i.e. at high angles to most regional mapped structures and sub-province boundaries) with little to no surface expression that are spatially associated with lode ('orogenic') Au and Ni-Cu-PGE-Cr occurrences. Statistical and machine learning analysis of the Red Lake-Stormy Lake region in the W Superior Province confirms visual inspection for a greater correlation between Au deposits and these deep N-S structures than with mapped surface to upper crustal, generally E-W trending, faults and shear zones. Porphyry Au, Ni, Mo and U-Th showings are also located above these deep transverse faults. Several well defined concentric circular to elliptical structures identified in the Oxford Stull and Island Lake domains along the S boundary of the N Superior proto-craton, intersected by N- to NNW striking extensional fractures and/or faults that transect the W Superior Province, again with little to no direct surface or upper crustal expression, are spatially associated with magmatic Ni-Cu-PGE-Cr and related mineralization and Au occurrences. The McFaulds Lake greenstone belt, aka. 'Ring of Fire', constitutes only a small, crescent-shaped belt within one of these concentric features above which 2736-2733 Ma mafic-ultramafic intrusions bodies were intruded. The Big Trout Lake igneous complex that hosts Cr-Pt-Pd-Rh mineralization west of the Ring of Fire lies within a smaller concentrically ringed feature at depth and, near the Ontario-Manitoba border, the Lingman Lake Au deposit, numerous Au occurrences and minor Ni showings, are similarly located on concentric structures. Preliminary magnetotelluric (MT) interpretations suggest that these concentric structures appear to also have an expression in the subcontinental lithospheric mantle (SCLM) and that lithospheric mantle resistivity features trend N-S as well as E-W. With diameters between ca. 90 km to 185 km, elliptical structures are similar in size and internal geometry to coronae on Venus which geomorphological, radar, and gravity interpretations suggest formed above mantle upwellings. Emplacement of mafic-ultramafic bodies hosting Ni-Cr-PGE mineralization along these ringlike structures at their intersection with coeval deep transverse, ca. N-S faults (viz. phi structures), along with their location along the margin to the N Superior proto-craton, are consistent with secondary mantle upwellings portrayed in numerical models of a mantle plume beneath a craton with a deep lithospheric keel within a regional N-S compressional regime. Early, regional ca. N-S faults in the W Superior were reactivated as dilatational antithetic (secondary Riedel/R') sinistral shears during dextral transpression and as extensional fractures and/or normal faults during N-S shortening. The Kapuskasing structural zone or uplift likely represents Proterozoic reactivation of a similar deep transverse structure. Preservation of discrete faults in the deep crust beneath zones of distributed Neoarchean dextral transcurrent to transpressional shear zones in the present-day upper crust suggests a 'millefeuille' lithospheric strength profile, with competent SCLM, mid- to deep, and upper crustal layers. Mechanically strong deep crustal felsic and mafic granulite layers are attributed to dehydration and melt extraction. Intra-crustal decoupling along a ductile décollement in the W Superior led to the preservation of early-formed deep structures that acted as conduits for magma transport into the overlying crust and focussed hydrothermal fluid flow during regional deformation. Increase in the thickness of semi-brittle layers in the lower crust during regional metamorphism would result in an increase in fracturing and faulting in the lower crust, facilitating hydrothermal and carbonic fluid flow in pathways linking SCLM to the upper crust, a factor explaining the late timing for most orogenic Au. Results provide an important new dataset for regional prospectively mapping, especially with machine learning, and exploration targeting for Au and Ni-Cr-Cu-PGE mineralization. Results also furnish evidence for parautochthonous development of the S Superior Province during plume-related rifting and cannot be explained by conventional subduction and arc-accretion models.
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Paktunc, A. D. St. Stephen Mafic-Ultramafic Intrusion and Related Nickel-Copper Deposits, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120381.

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Manor, M. J., C. J. Wall, G. T. Nixon, J. S. Scoates, R H Pinsent, and D. E. Ames. Preliminary geology and geochemistry of the Giant Mascot ultramafic-mafic intrusion, Hope, southwestern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293429.

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Trevisan, B. E., P. Hollings, D. E. Ames, and N. M. Rayner. The petrology, mineralization, and regional context of the Thunder mafic to ultramafic intrusion, Midcontinent Rift, Thunder Bay, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296685.

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