Supplemental Material: Latest Silurian syntectonic sedimentation and magmatism and Early Devonian orogenic gold mineralization, central Newfoundland Appalachians, Canada: Setting, structure, lithogeochemistry, and high-precision U-Pbgeochronology

Honsberger, Ian W.; al., et

doi:10.1130/gsab.s.18858221.v1

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“…Overlapping ca. 410 Ma ID-TIMS U-Pb ages for hydrothermal rutile in quartz veins from both the Leprechaun Pond deposit and the Elm Prospect of the Wilding Lake property (Honsberger et al 2022a) indicate an Early Devonian (late Lochkovian) age for quartz vein emplacement associated with orogenic gold mineralization. The 40 Ar/ 39 Ar geochronology sample from the Leprechaun Pond deposit, VL-24-62.1m, is a weakly auriferous, bleached, fine-grained, foliated and quartz-veined tourmaline-muscovite-bearing trondhjemite from drillcore (62.1-63.0 metres depth: Figs.…”

Section: Leprechaun Pond Deposit (Valentine Lake)mentioning

confidence: 98%

“…Furthermore, splays of the Baie Verte-Brompton Line must have been active post-Ordovician accretion to form Silurian vein-hosted gold mineralization (Dubé et al 1993;Poulsen et al 2000). In central Newfoundland, the approximately five-millionounce gold deposit at Valentine Lake and numerous gold prospects along strike (e.g., Wilding Lake prospect) are hosted along an Early Devonian thrust-backthrust system (Honsberger et al 2022a) that imbricated rocks of the Exploits Subzone and Gander Zone and uplifted the Meelpaeg nappe along the Noel Paul's Line.…”

Section: Ghf Ghf B D F B D F H E Rm It a G E B A Y Fa U Lt H E Rm It ...mentioning

confidence: 99%

“…422 Ma felsic subvolcanic and volcanic rocks in the footwall of the northeastern extension of the Valentine Lake shear zone (WL on Fig. 1; Honsberger et al 2019a;2019b;2020a;2020b;2022a). Overlapping ca.…”

Section: Leprechaun Pond Deposit (Valentine Lake)mentioning

confidence: 99%

“…In contrast, the ca. 410 Ma chemical abrasion (CA) TIMS ages for rutile from auriferous quartz veins at the Wilding Lake gold prospect and Leprechaun Pond gold deposit (Honsberger et al 2022a) provide high-precision maximum constraints on the age of orogenic gold-mineralized quartz vein emplacement. Detailed investigations of vein and alteration mineral parageneses, their relationships to gold deposition and systematic geochronological study of different mineral species are required to better understand the timing of gold mineralization in Newfoundland.…”

Section: Rattling Lakementioning

confidence: 99%

“…Extant geochronological investigations on gold zones are limited to those from the Hope Brook (Dubé et al 1995) and Cape Ray deposits (Dubé et al 1996;Dubé and Lauzière 1997) and select geochronological studies at the Nugget Pond (Sangster et al 2008) and Hammerdown (Ritcey et al 1995) deposits. Subjects of more recent gold-related, paragenetic, lithogeochemical and geochronological studies include: the Rattling Brook (Kerr and van Breemen 2007) and Thor prospects (Minnett et al 2012) in western Newfoundland (White Bay); the Pine Cove (Ybarra 2020) and Ming (Au-rich VMS) deposits of Baie Verte Peninsula (Pilote et al 2020); and the central Newfoundland gold district (Valentine Lake deposit and Wilding Lake prospect ;Honsberger et al 2022a).…”

Section: Introductionmentioning

confidence: 99%

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Overview of age constraints for gold mineralization in central and western Newfoundland and new 40Ar/39Ar ages for muscovite from selected auriferous zones

Sandeman¹,

Honsberger²,

Camacho³

2022

atlgeo

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This contribution presents new 40Ar/39Ar laser step-heating data for muscovite associated with four significant orogenic gold-mineralized zones in central and western Newfoundland to build upon existing geochronological constraints for orogenic gold mineralization across much of the Newfoundland Appalachians. Additionally, we provide the first 40Ar/39Ar laser step-heating data for detrital muscovite from gold-mineralized sandstone of the Wigwam Formation (Botwood Group) at the Moosehead gold prospect. Most known gold zones on the isIand occur in proximity to reactivated crustal-scale faults and related structures, and are commonly localized within competent, rigid lithological units (e.g., granitoid rocks); although, some vein systems cut less competent, clastic sedimentary rock sequences. Host rocks range in age from Neoproterozoic to Devonian and may extend into the Carboniferous. Robust Pragian to Emsian (ca. 410–375 Ma) rutile, muscovite and zircon ages constrain the timing of gold mineralization in parts of the Exploits Subzone, whereas less precise age estimates for gold mineralization in the Notre Dame Subzone and Laurentian margin range from Wenlock to Emsian (ca. 433–375 Ma). Collectively, the geochronological data suggest that fluid-pressure cycling associated with gold mineralization in central and western Newfoundland occurred during progressive Siluro-Devonian tectonics associated with the waning stages of the Salinic orogenic cycle and spanning the Acadian and Neoacadian orogenic cycles. Multiple, polyphase, overlapping orogenic events allowed for repeated, gold mineralizing fluid flow events, particularly in proximity to long-lived, reactivated crustal-scale fault zones.

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Section: Leprechaun Pond Deposit (Valentine Lake)mentioning

confidence: 98%