Conodont Biostratigraphy and Constraints On Upper Devonian Mineral Deposits in the Earn Group, northern British Columbia

Irwin, S E B; Orchard, M J

doi:10.4095/127438

Cited by 2 publications

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“…10). This event is also coeval with rifting, alkalic magmatism, and VMS deposit formation (Wolf, MM deposits) in the Cassiar terrane (Mortensen and Godwin 1982;Mortensen 1982;Holbek and Wilson 1998); rifting, clastic sedimentation, and VMS and SEDEX activity in the Selwyn basin and Kechika trough (Gordey et al 1987;Irwin and Orchard 1989;Paradis et al 1998); and initial opening of the Slide Mountain Ocean (Nelson 1993;Nelson and Bradford 1993;Creaser et al 1999). These features point to a coupled tectonic and metallogenic history for both the YTT and the North American margin in the mid-Paleozoic (e.g., Paradis and Nelson 2000).…”

Section: Tectonic Significancementioning

confidence: 94%

Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Piercey¹,

Mortensen²,

Creaser³

2003

Can. J. Earth Sci.

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DevonianMississippian felsic rocks from the Finlayson Lake region have variable geochemical and Nd isotopic characteristics that provide insights into the tectonic and metallogenic evolution of the YukonTanana terrane (YTT), and the northern Cordillera. Late Devonian (~365360 Ma) calc-alkaline and tholeiitic arc felsic rocks in the mafic-dominated Fire Lake unit yield εNd350 = 4.8 and +0.1, respectively, and have 1.491.94 Ga depleted mantle model ages (TDM). DevonianMississippian (~360356 Ma) felsic volcanic (Kudz Ze Kayah unit, Wolverine succession) and intrusive rocks (Grass Lakes suite) associated with volcanogenic massive sulphide (VMS) deposits have εNd350 = 7.8 to 9.5 with TDM = 1.592.25 Ga. A granitoid sample from the Early Mississippian (~350345 Ma) Simpson Range plutonic suite has εNd350 = 12.9 and TDM = 2.01 Ga, similar to previously reported values for this suite. The VMS-associated Grass Lakes suite of granitoids has higher high field strength element (HFSE) and rare-earth element (REE) contents, and higher Zr/Sc, Zr/TiO2, Nb/La, and Zr/La values relative to the Simpson Range plutonic suite; these geochemical features are similar to coeval VMS-associated felsic volcanic rocks in the Kudz Ze Kayah unit. The identification of similar HFSEREE-enriched felsic volcanic and subvolcanic intrusive rocks may aid in delineating prospective regions for VMS mineralization in the YTT and other continental-margin arc to back-arc environments. The geochemical and Nd isotopic data for these YTT felsic rocks suggest that they reflect episodic mid-Paleozoic arc (Fire Lake unit; Simpson Range plutonic suite) and back-arc magmatism (Kudz Ze Kudz unit; Wolverine succession) built upon a transitional basement with variable, but significant, influence from evolved (Proterozoic) crustal materials.

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Section: Tectonic Significancementioning

confidence: 94%

Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Piercey¹,

Mortensen²,

Creaser³

2003

Can. J. Earth Sci.

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“…Conodonts from the study area have been reported from reconnaissance studies and from the overlying Upper Devonian -Mississippian Earn Group. The present study provides biostratigraphic constraints on the Deserters Formation (new) within the Road River Group that lies stratigraphically above the Silurian Pesika and Kwadacha formations (Pyle and Barnes 2000) and below the Devono-Mississippian Earn Group (Irwin and Orchard 1989). In the study area the Deserters Formation is in fault contact with the underlying Silurian units at the Ospika River section and is overlain unconformably by the Earn Group regionally (Fig.…”

Section: Previous Workmentioning

confidence: 68%

Conodont biostratigraphy of the Lower to Middle Devonian Deserters Formation (new), Road River Group, northeastern British Columbia

et al. 2003

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A new Lower to Middle Devonian basinal unit of the Road River Group, herein formally named the Deserters Formation, contains argillaceous, crinoidal limestone and black shale deposited in a linear sub-basin of the Ospika Embayment, southern Kechika Trough. The abrupt lateral facies changes in the region, facies thickness, and occurrence of volcanics indicate a period of extensional tectonism. A total of 53 (45 kg each) samples from the Deserters Formation yielded 7766 conodont elements assigned to 14 genera representing 33 species. The formation ranges from the Lochkovian (eleanorae Zone, or lower part of the delta Zone of the Cordilleran Region) to Eifelian (australis Zone). The temporal constraints established by conodont biostratigraphy allow correlation to the Grizzly Bear Formation, a regionally restricted Lower to Middle Devonian unit in the Selwyn Basin to the north.

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Conodont Biostratigraphy and Constraints On Upper Devonian Mineral Deposits in the Earn Group, northern British Columbia

Cited by 2 publications

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Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Conodont biostratigraphy of the Lower to Middle Devonian Deserters Formation (new), Road River Group, northeastern British Columbia

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Conodont Biostratigraphy and Constraints On Upper Devonian Mineral Deposits in the Earn Group, northern British Columbia

Cited by 2 publications

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Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Conodont biostratigraphy of the Lower to Middle Devonian Deserters Formation (new), Road River Group, northeastern British Columbia

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Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada

Neodymium isotope geochemistry of felsic volcanic and intrusive rocks from the YukonTanana Terrane in the Finlayson Lake Region, Yukon, Canada