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GEOREF RECORD

Sedimentary nickel, zinc, and platinum-group-element mineralization in Devonian black shales at the Nick Property, Yukon, Canada; a new deposit type

Larry J. Hulbert, Robert C. Carne, D. Conrad Gregoire and Dogan Paktunc
Sedimentary nickel, zinc, and platinum-group-element mineralization in Devonian black shales at the Nick Property, Yukon, Canada; a new deposit type (in International Association on the Genesis of Ore Deposits, Eighth quadrennial symposium, I. R. Jonasson (editor))
Exploration and Mining Geology (January 1992) 1 (1): 39-62

Abstract

A thin layer of stratiform Ni-Zn-PGE sulphide mineralization of sedimentary-diagenetic origin was deposited during the Middle- Upper Devonian in the euxinic 'Nick basin' approx 130 km N of Mayo in the Yukon Territory. The mineralized unit (>= 3 cm thick), which seems to have developed over the entire sedimentary basin of > 80 km (super 2) , consists of pyrite, vaesite and sphalerite, the average grade is approx 5.3% Ni, 0.73% Zn, approx 770 ppb PGE + Au, and <= 61 ppm Re; anomalous Se, As, Mo, P, Ba and U are present. A minimum of 900 000 t of Ni were deposited in the basin during the Devonian. The unusual and stratigraphic control demonstrate that this is a new deposit type and a new geological environment for Ni and PGE + Au. The sulphide layer is underlain by a unit with concretionary limestone structures; these spheroids may represent a vent-specific carbonate facies developed adjacent to faults that emanated nutrient-rich hydrothermal discharges prior to the main mineralizing event. The suite of associated elements suggest derivation of the ore-forming metals from decaying marine organisms: discharge of hot brines bearing organic- matter-bound metals took place along conduits in faults now manifest as bitumen veins. The diagnostic vaesite-pyrite assemblage is thought to have crystallized at approx 138 degrees C; the delta (super 13) C values range from -14.7 to -10.0 per mille and are up to 34 per mille higher than local sulphides. The delta (super 13) C values of calcite in the footwall of the mineralized unit (-12 to -6 per mille) are much lighter than regional values, which is attributed to the hydrothermal discharge of fluids enriched in organic compounds. This new journal is a publication of the Geological Society of The Canadian Institute of Mining, Metallurgy & Petroleum. It deals with mineral deposits, geochemistry, geophysics, mining geology and geomathematics. It is published quarterly; the subscription for individuals is pounds22.90 (US$40.00) per annum; library rate (pounds69.06 (US$125.00).


ISSN: 0964-1823
Serial Title: Exploration and Mining Geology
Serial Volume: 1
Serial Issue: 1
Title: Sedimentary nickel, zinc, and platinum-group-element mineralization in Devonian black shales at the Nick Property, Yukon, Canada; a new deposit type
Title: International Association on the Genesis of Ore Deposits, Eighth quadrennial symposium
Author(s): Hulbert, Larry J.Carne, Robert C.Gregoire, D. ConradPaktunc, Dogan
Author(s): Jonasson, I. R.editor
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Pages: 39-62
Published: 199201
Text Language: English
Publisher: Pergamon Press [for the] Geological Society of the Canadian Institute of Mining, Metallurgy and Petroleum, New York - Oxford, International
Meeting name: International Association on the Genesis of Ore Deposits, Eighth quadrennial symposium
Meeting location: Ottawa, ON, CAN, Canada
Meeting date: 19900812Aug. 12-18, 1990
References: 80
Accession Number: 1993-048122
Categories: Economic geology, geology of ore deposits
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., strat. cols., 2 tables, geol. sketch maps
N64°43'00" - N64°43'00", W135°13'00" - W135°13'00"
Secondary Affiliation: Archer, Cathro and Associates, CAN, Canada
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1993
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