Geochronologic (Re Os) and fluid-chemical constraints on the formation of the Mesoproterozoic-hosted Nanisivik Zn Pb deposit, Nunavut, Canada: Evidence for early diagenetic, low-temperature conditions of formation

Hnatyshin, Danny; Kontak, Daniel J.; Turner, Elizabeth C.; Creaser, Robert A.; Morden, Robert; Stern, Richard A.

doi:10.1016/j.oregeorev.2016.05.017

Cited by 24 publications

(17 citation statements)

References 56 publications

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“…1) suggest approximately syn-depositional mineralization ca. 1.1 billion years ago (Ga), though the data span 1.151-1.013 Ga (Hnatyshin et al, 2016), which is broadly consistent with depositional ages presented from this study. Turner and Kamber (2012) were excluded in these calculations and stratigraphic heights are not reported.…”

Section: Figure Dr4 Re-os Geochronological Data and Isochron Diagramsupporting

confidence: 89%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

161

128

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Shale samples were collected from outcrops that lack evidence for secondary mineralization from hydrothermal activity and weathered regions that may have experienced alteration were also avoided. Sample sets comprise several 100-200 g samples excavated 10-30 cm from the outcrop surface to target fresh material. Samples were collected along strike from a narrow stratigraphic range (<10 cm), as well as from a vertical profile (up to 5 m). The most organic-rich and least visibly-weathered samples were then chosen for digestion and isotopic

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Section: Figure Dr4 Re-os Geochronological Data and Isochron Diagramsupporting

confidence: 89%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

161

128

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“…Samples of the HEBS mineralization were collected from the regional stratigraphic contact at both Peel River (65.893°N, 135.931°W) and Nick (64.728°N, 135.235°W) and were processed at the University of Alberta (Edmonton, Alberta, Canada) using the methods of Hnatyshin et al (2016). Mineral separates (n = 9) from Peel River sample 17-POA-049c have Re and Os abundances of 30.1-44.2 ppm and 179-325 ppb, respectively.…”

Section: Re-os Geochronologymentioning

confidence: 99%

A Middle Devonian basin-scale precious metal enrichment event across northern Yukon (Canada)

Gadd

Peter

Hnatyshin

et al. 2020

Geology

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Hyper-enriched black shale (HEBS) Ni-Mo-Zn-Pt-Pd-Au-Re mineralization is geographically widespread across the Richardson trough in northern Yukon (Canada), where it discontinuously outcrops at the regional contact between the Road River Group and overlying Canol Formation. Stratigraphic relationships indicate that the contact is Middle Devonian, but there are no precise age constraints for the HEBS. We apply Re-Os geochronology to HEBS mineralization from two localities that are 130 km apart, the Nick prospect and the Peel River showing, to date directly the age of sulfide mineralization. The Nick prospect yields an isochron age of 390.7 ± 5.1 (2σ) Ma, whereas the Peel River showing yields an isochron age of 387.5 ± 4.4 (2σ) Ma. Within error, these ages are identical and overlap with the biostratigraphically constrained age of the sedimentary host rocks, indicating that mineralization and sedimentation were coeval. Significantly, the ages of the HEBS overlap those of Middle Devonian Kačák, pumilio, and Taghanic global-scale biotic events which are characterized by eustatic sea-level rise and black shale deposition. Linkage of the Yukon HEBS to one (or more) of these bio-events indicates that sea-level rise may have been requisite to formation of basin-scale HEBS mineralization in northwestern Canada during latest Eifelian and Givetian time.

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“…The Carius tubes were sealed and heated to 220°C for 48 (pyrite) to 72 h (mudstone) to ensure samplespike equilibration. Additional details of the chemical procedures for sample digestion and purification of Re and Os are provided by Selby and Creaser (2003) and Hnatyshin et al (2016).…”

Section: Re-os Sampling and Analytical Methodsmentioning

confidence: 99%

Diagenetic Controls on the Formation of the Anarraaq Clastic-Dominated Zn-Pb-Ag Deposit, Red Dog District, Alaska

et al. 2021

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The Anarraaq clastic-dominated (CD) Zn-Pb-Ag deposit (Red Dog district, Alaska, USA) has an inferred mineral resource of 19.4 Mt at 14.4% Zn, 4.2% Pb, and 73 g/t Ag and is spatially associated with a separate ~1 Gt barite body. This study presents new cross sections and petrographic evidence from the Anarraaq area. The barite body, previously shown to have formed in a shallow subsurface environment akin to a methane cold seep, contains multiple generations of barite with locally abundant calcite masses, which are discordant to sedimentary laminae, and is underlain by an interval of massive pyrite containing abundant framboids and radiolarians. Calcite and pyrite are interpreted to have formed by methane-driven diagenetic alteration of host sediment at the sulfate-methane transition (SMT). The sulfide deposit contains two zones of Zn-Pb mineralization bounded by faults of unknown displacement. The dominant hydrothermal minerals are marcasite, pyrite, sphalerite, quartz, and galena. The presence of hydrothermal pseudomorphs after barite, early pyrite resembling diagenetic pyrite associated with the barite body, and hydrothermal quartz and sphalerite filling voids formed by dissolution of carbonate all suggest that host sediment composition and origin was similar to that of the barite body prior to hydrothermal mineralization. Rhenium-osmium isochron ages of Ikalukrok mudstone (339.1 ± 8.3 Ma), diagenetic pyrite (333.0 ± 7.4 Ma), and hydrothermal pyrite (334.4 ± 5.3 Ma) at Anarraaq are all within uncertainty of one another and of an existing isochron age (~338 Ma) for the Main deposit in the Red Dog district. This indicates that the Anarraaq deposit formed soon after sedimentation and that hydrothermal activity was approximately synchronous in the district. The initial Os composition of the Anarraaq isochrons (0.375 ± 0.019–0.432 ± 0.025) is consistent with contemporaneous seawater, indicating that a mantle source was not involved in the hydrothermal system. This study highlights the underappreciated but important role of early, methane-driven diagenetic processes in the paragenesis of some CD deposits and has important implications for mineral exploration.

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Geochronologic (Re Os) and fluid-chemical constraints on the formation of the Mesoproterozoic-hosted Nanisivik Zn Pb deposit, Nunavut, Canada: Evidence for early diagenetic, low-temperature conditions of formation

Cited by 24 publications

References 56 publications

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

A Middle Devonian basin-scale precious metal enrichment event across northern Yukon (Canada)

Diagenetic Controls on the Formation of the Anarraaq Clastic-Dominated Zn-Pb-Ag Deposit, Red Dog District, Alaska

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