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Lead isotope ratios in till and vegetation over a VMS occurrence under significant allochthonous cover

Pim W. G. van Geffen, T. Kurt Kyser, Christopher J. Oates and Christian Ihlenfeld
Lead isotope ratios in till and vegetation over a VMS occurrence under significant allochthonous cover
Geochemistry - Exploration, Environment, Analysis (February 2013) 13 (1): 53-61

Abstract

Two size fractions of till, <250 mu m and <2 mu m, humus, moss and black spruce bark, as well as sulphides, host rocks and Palaeozoic cover dolostone from drill cores were sampled at the Talbot Lake volcanogenic massive sulphide (VMS) prospect in the Flin Flon-Snow Lake terrane, Manitoba, Canada. Lead isotope-ratios in organic surface media indicate significant input of anthropogenic Pb from the Flin Flon smelter at 160 km distance to the northwest, with (super 206) Pb/ (super 204) Pb between 16.5 and 18.2, whereas background till and upper dolostone range between 21.6 and 23.1. At deeper levels, the influx of Pb from Proterozoic mineralization from greater than 100 m depth is recognized. Strontium isotope ratios in these media indicate enhanced vertical fluid flow in the till cover at a fault zone, coincident with the Pb isotope anomaly, as well as relative contributions of Sr from carbonates, silicates and vegetation to the till profile. In humus, sphagnum moss and black spruce bark, the Pb isotope ratios are progressively more similar to that of the feed of the Flin Flon smelter. Measurements of Pb and Sr isotope ratios reveal that Pb from Proterozoic mineralization situated beneath 100 m of Palaeozoic dolostone can be distinguished from Pb contributed by anthropogenic and other geogenic sources.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 13
Serial Issue: 1
Title: Lead isotope ratios in till and vegetation over a VMS occurrence under significant allochthonous cover
Affiliation: Queen's University, Kingston, ON, Canada
Pages: 53-61
Published: 201302
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 42
Accession Number: 2013-025207
Categories: Isotope geochemistryEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N54°55'60" - N54°55'60", W100°00'00" - W100°00'00"
Secondary Affiliation: Applied Geochemistry Solutions, GBR, United KingdomAnglo American, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201316
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