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Provenance of exhalites associated with the Lemarchant volcanogenic massive sulphide (VMS) deposit, central Newfoundland, Canada: Insights from Nd isotopes and lithogeochemistry

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Lode, S, Piercey, SJ and Cloutier, J ORCID: 0000-0002-9432-9880 2017 , 'Provenance of exhalites associated with the Lemarchant volcanogenic massive sulphide (VMS) deposit, central Newfoundland, Canada: Insights from Nd isotopes and lithogeochemistry' , Journal of the Geological Society, vol. 174, no. 6 , pp. 954-967 , doi: 10.1144/jgs2017-008.

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Abstract

Neodymium isotope data on exhalites and tuffs from the Cambrian Lemarchant volcanogenic massive sulphide (VMS) deposit provide insights into the tectonic environment of the Tally Pond group, Canada. New data from exhalites from the Lemarchant area show evolved values of εNd513 = -6.0 to -1.8, whereas the associated volcanic rocks have εNd513 of +0.4 to +1.4. The Lemarchant exhalite εNd compositions overlap the underlying Ganderian Neoproterozoic Sandy Brook Group (εNdt = -6.5 to -1.9) and Crippleback Intrusive Suite (εNdt = -5.9 to -5.2). The evolved Nd isotopic signatures suggest that the volcanic rocks of the Tally Pond group were formed upon Ganderian arc basement, which itself was possibly built upon, or proximal to, the Gondwanan Amazonian margin. Erosion of older crustal material and Tally Pond group volcanic rocks, together with coeval eruption of the volcanic rocks, released Nd-rich detritus into the water column. Uptake of eroded detrital and scavenged Nd resulted in mixed Nd sources (juvenile and evolved), which are archived in the exhalites. The results of this study are not only of significance for occurrences of exhalites within the Tally Pond group, but also have exploration implications for VMS districts globally.

Item Type: Article
Authors/Creators:Lode, S and Piercey, SJ and Cloutier, J
Keywords: deposits, isotopes, lakes, rocks, sulfur compounds, volcanoes, crustal materials, isotopic signatures, Nd isotopes, neodymium isotopes, Neoproterozoic, Newfoundland Canada, volcanogenic massive sulphides, water columns, volcanic rocks, Gondwana
Journal or Publication Title: Journal of the Geological Society
Publisher: Geological Soc Publ House
ISSN: 0016-7649
DOI / ID Number: 10.1144/jgs2017-008
Copyright Information:

Copyright 2017 the authors

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