P–T composition and evolution of paleofluids in the Paleoproterozoic Mag Hill IOCG system, Contact Lake belt, Northwest Territories, Canada

Somarin, Alireza Karimzadeh; Mumin, A H

doi:10.1007/s00126-013-0482-3

Cited by 19 publications

(19 citation statements)

References 31 publications

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“…Iron oxide copper-gold styles of mineralization and IOA ± actinolite mineralization are recognized throughout the Great Bear magmatic zone, where they are spatially and temporally related to one another and extensive magmatism (Badham and Morton, 1976;Hildebrand, 1986;Gandhi, 1994;Goad et al, 2000;Mumin et al, 2007Mumin et al, , 2010Corriveau et al, 2010a, b;Potter et al, 2013;Somarin and Mumin, 2014;Acosta-Góngora et al, 2014, 2015a accepted with revisions; Mumin, 2015). We present a large-scale overview of the Great Bear magmatic zone and its geodynamic setting.…”

Section: Accepted M Manuscriptmentioning

confidence: 94%

“…Commonly, the parental mineralizing fluids are highly saline (up to 60% wt.% NaCl equiv.) + CO 2 -rich fluids (e.g., Oreskes and Einaudi, 1992;Huston et al, 1993;Perring et al, 2000;Baker et al, 2008;Somarin and Mumin, 2014). Despite these commonalities,…”

Section: Iocg and Ioa Depositsmentioning

confidence: 99%

“…2C-D; Gandhi, 1994) and hence-forth were considered as IOCG deposits (Goad et al, 2000). In the Echo Bay region the IOCG model has been used in exploration and to reclassify previously known mineralization and alteration (Corriveau, 2007;Mumin et al, 2007Mumin et al, , 2010Somarin and Mumin, 2014;Mumin et al 2014). The NICO deposit in the southern Great Bear was recognized by Goad et al (2000) as an IOCG-like deposit, and this has been supported by detailed mineral deposit and regional alteration studies (Table 1; Acosta-Góngora et al 2015a, b;Montreuil et al 2013Montreuil et al , 2015.…”

Section: Iocg and Ioa Depositsmentioning

confidence: 99%

“…Type examples occur in the Camsell River area, adjacent to the Terra polymetallic vein deposit ( Fig. 2A-B; Badham and Morton, 1976;Hildebrand, 1986) and in the Echo Bay area (Reardon, 1992;Somarin and Mumin, 2014); less-voluminous examples occur throughout the Great Bear magmatic zone as veins, breccia cements, and replacements (Table 1: Gandhi, 1994;Corriveau et al, 2007Corriveau et al, , 2010bMumin et al, 2007Mumin et al, , 2010Potter et al, 2013;Acosta-Góngora et al, 2014).…”

Section: Iocg and Ioa Depositsmentioning

confidence: 99%

“…This indicates these older phases were extensively altered during younger magmatic/mineralizing phases. The alteration zones associated with the mineralization are spatially extensive (Table 1; Corriveau et al, 2007Mumin et al, 2007Mumin et al, , 2010Montreuil et al, 2013Montreuil et al, , 2015Montreuil et al, , 2016Potter et al, 2013;Somarin and Mumin, 2014;Mumin, 2015), and it is possible that other pre-mineralization plutonic rocks existed in the Great Bear magmatic zone, but may have been altered and obscured by younger metasomatic events Corriveau et al, 2015).…”

Section: Geochronologymentioning

confidence: 99%

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A Paleoproterozoic Andean-type iron oxide copper-gold environment, the Great Bear magmatic zone, Northwest Canada

Ootes

Snyder

Davis

et al. 2017

Ore Geology Reviews

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Iron oxide copper-gold (IOCG) and associated iron-oxide apatite (IOA) styles of metallic mineralization are recognized throughout the Paleoproterozoic Great Bear magmatic zone of the northwest Canadian Shield. The Great Bear magmatic zone was constructed between ca. 1876 and 1855 Ma on top of the older Hottah terrane, which preserves continental arc magmatism that began around ca. 2.0 to 1.97 Ga and continued between ca. 1.93 and 1.89 Ga. The Great Bear represents the final stages of ca. 150 million years of intermittent and pulsed magmatism related to an evolving continental orogenic belt. The preserved geology supports a dramatic geodynamic change in the subduction zone process at ca. 1875 Ma, a key driving mechanism for magma and metal mobilization, and was rapidly followed by a large-scale introduction of felsic-intermediate plutons. The overall tectonic setting is partially constrained from new and previously published geochemical data that show that the volcanic and plutonic rocks are high-K calc-alkaline to shoshonitic in nature (e.g., high K 2 O, Th/Yb, and Ce/P 2 0 5 ). They also have suprasubduction-zone geochemical signatures, including primitive mantle normalized positive Th and negative Nb, P, and Ti anomalies. The data support the primary melts were derived from a GLOSS-modified mantle wedge. Three-dimensional rendering of geophysical datasets suggest that two (of four) preserved surfaces within the upper mantle lithosphere, at 70 to 120 km depths, represent frozen, subducted oceanic slabs, and likely were the drivers for the bulk of Hottah and Great Bear arc magmatism. The older slab is northwest-striking and dips 12⁰ to 15⁰ northeast, whereas the younger is deeper and north-striking, dipping 13⁰ east. The geometry of the surfaces are comparable with 4D modeling, where a subduction zone is temporarily shut down due to plateau collision, and then steps oceanward and re-initiates; there is no need for polarity reversal of the subduction system. This new geometry and the related inferences about process should be the focus of future research in the region, but for the time-being it can be stated that these subduction and collisional processes were the first order control on lithospheric evolution, and therefore metallic mineralization. Overall, the Great Bear magmatic zone IOCG and related mineralization is not comparable to other Proterozoic IOCG belts, such as those in Australia. However, the complexity of mineralization styles, the spatial-temporal relationship between IOA and IOCG mineralization, the suprasubduction zone environment, and a major change in tectonic regime are features similar to Andean-type IOCG mineralization, as well as Cordilleran alkali porphyry Cu-A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 Au deposits. This further establishes the linkages between subduction zone processes and IOCG formation, as well as relationships in the IOCG-porphyry deposit continuum model.

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