Timing and thermochemical constraints on multi-element mineralisation at the Nori/RA Cu–Mo–U prospect, Great Bear magmatic zone, Northwest Territories, Canada

Ootes, Luke; Goff, Steve; Jackson, Valerie A.; Gleeson, Sarah A.; Creaser, Robert A.; Samson, Iain M.; Evensen, N. M.; Corriveau, Louise; Mumin, A H

doi:10.1007/s00126-010-0291-x

Cited by 25 publications

(17 citation statements)

References 38 publications

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“…1873 and 1869 Ma ( Fig. 3; Ootes et al, 2010;Acosta-Góngora et al, 2015b;Montreuil et al, 2013Montreuil et al, , 2016. The IOA mineralization is related to fractionation of intermediate, high-level plutons (Badham and Morton, 1976;Hildebrand, 1986;Reardon, 1992).…”

Section: Iocg and Ioa Depositsmentioning

confidence: 96%

“…Early stages of metallic mineralization include intrusion-related Cu-Mo-U within tourmaline-biotite veins that cut the Treasure Lake Group (Gandhi, 1994;Ootes et al, 2010). A Re-Os molybdenite date (1873.4 ± 6.1 Ma) and an Ar-Ar biotite date (1875 ± 8 Ma) indicates vein formation and mineralization at that time ( Fig.…”

Section: Geochronologymentioning

confidence: 99%

“…A Re-Os molybdenite date (1873.4 ± 6.1 Ma) and an Ar-Ar biotite date (1875 ± 8 Ma) indicates vein formation and mineralization at that time ( Fig. 3; Ootes et al, 2010). South of the NICO Co-Bi-Au deposit, at the southern breccia zone, Re-Os molybdenite dating indicates initial mineralization at 1877 ± 8 Ma (Acosta-Góngora et al, 2015b) and U-Pb zircon dating of an altered felsic dyke at 1873 ± 2 Ma ( Fig.…”

Section: Geochronologymentioning

confidence: 99%

“…Modified after Ootes et al (2010) and AcostaGóngora et al (2014AcostaGóngora et al ( , 2015a. The Holy Lake metamorphic complex detrital zircon probability histogram is shown to demonstrate the antiquity of the Hottah terranes source environment (modified after Davis et al, 2015).…”

Section: Accepted M Manuscriptmentioning

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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Section: Iocg and Ioa Depositsmentioning

confidence: 96%

Section: Geochronologymentioning

confidence: 99%

Section: Geochronologymentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

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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“…volcanic rocks of the Great Bear magmatic zone (Gandhi 1994;Jackson 2008;Ootes et al 2010). The volcanic rocks, which are preserved in a few small islands in the southern part of the lake, are variably altered; lithic fragments are altered to either magnetite, actinolite, or biotite.…”

Section: Rhyolitic Ash Tuff (Dl)mentioning

confidence: 99%

Chronostratigraphy of the Hottah terrane and Great Bear magmatic zone of Wopmay Orogen, Canada, and exploration of a terrane translation model

et al. 2015

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Abstract:The Paleoproterozoic Hottah terrane is the westernmost exposed bedrock of the Canadian Shield and a critical component for understanding the evolution of the Wopmay Orogen. Thirteen new high-precision U-Pb zircon crystallization ages are presented and support field observations of a volcano-plutonic continuum from Hottah terrane through to the end of the Great Bear magmatism, from >1950 to 1850 Ma. The new crystallization ages, new geochemical data, and newly published detrital zircon U-Pb data are used to challenge hitherto accepted models for the evolution of the Hottah terrane as an exotic arc and microcontinent that arrived over a west-dipping subduction zone and collided with the Slave craton at ca. 1.88 Ga. Although the Hottah terrane does have a tectonic history that is distinct from that of the neighbouring Slave craton, it shares a temporal history with a number of domains to the south and east -domains that were tied to the Slave craton by ca. 1.97 Ga. It is interpreted herein that Hottah terrane began to the south of its current position and evolved in an active margin over an always east-dipping subduction system that began prior to ca. 2.0 Ga and continued to ca. 1.85 Ga, and underwent tectonic switching and migration. The stratigraphy of the ca. 1913-1900 Ma Hottah plutonic complex and Bell Island Bay Group includes a subaerial rifting arc sequence, followed by basinal opening represented by marginal marine quartz arenite and overlying ca. 1893 Ma pillowed basalt flows and lesser rhyodacites. We interpret this stratigraphy to record Hottah terrane rifting off its parental arc crust -in essence the birth of the new Hottah terrane. This model is similar to rapidly rifting arcs in active margins -for example, modern Baja California. These rifts generally occur at the transition between subduction zones (e.g., Cocos-Rivera plates) and transtensional shear zones (e.g., San Andreas fault), and we suggest that extension-driven transtensional shearing, or, more simply, terrane translation, was responsible for the evolution of Bell Island Bay Group stratigraphy and that it transported this newly born Hottah terrane laterally (northward in modern coordinates), arriving adjacent to the Slave craton at ca. 1.88 Ga. Renewed east-dipping subduction led to the Great Bear arc flare-up at ca. 1876 Ma, continuing to ca. 1869 Ma. This was followed by voluminous Great Bear plutonism until ca. 1855 Ma. The model implies that it was the westerly Nahanni terrane and its subducting oceanic crust that collided with this active margin, shutting down the >120 million year old, east-dipping subduction system.

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The Southern Breccia Metasomatic Uranium System of the Great Bear Magmatic Zone, Canada

Potter

Montreuil

Corriveau

et al. 2019

Geophysical Monograph Series

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Timing and thermochemical constraints on multi-element mineralisation at the Nori/RA Cu–Mo–U prospect, Great Bear magmatic zone, Northwest Territories, Canada

Cited by 25 publications

References 38 publications

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

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

Chronostratigraphy of the Hottah terrane and Great Bear magmatic zone of Wopmay Orogen, Canada, and exploration of a terrane translation model

The Southern Breccia Metasomatic Uranium System of the Great Bear Magmatic Zone, Canada

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