Early Proterozoic magmatism in Yukon, Canada: constraints on the evolution of northwestern Laurentia

Northwestern Laurentia, after cratonization at about 1.85 Ga, underwent a series of tectonic and magmatic events during the Proterozoic that were followed by separation of Laurentia from another landmass, probably Australia. The oldest magmatic event produced the Bonnet Plume River Intrusions (BPRI)...

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Bibliographic Details
Published in:Canadian Journal of Earth Sciences
Main Authors: Thorkelson, D, Mortenson, JK, Creaser, RA, Davidson, GJ, Abbott, JG
Format: Article in Journal/Newspaper
Language:English
Published: National Research Council, Canada 2001
Subjects:
Earth Sciences
Geology
Igneous and Metamorphic Petrology
Bonnet Plume River
British Columbia
Canada
East Antarctica
Wernecke
Yukon
Antarc*
Antarctica
Online Access:https://doi.org/10.1139/cjes-38-10-1479
http://ecite.utas.edu.au/23264
Description
Summary:Northwestern Laurentia, after cratonization at about 1.85 Ga, underwent a series of tectonic and magmatic events during the Proterozoic that were followed by separation of Laurentia from another landmass, probably Australia. The oldest magmatic event produced the Bonnet Plume River Intrusions (BPRI), which intruded the Wernecke Supergroup as short dikes and small stocks. The BPRI are hydrothermally altered tholeiitic diorites, gabbros, and subordinate anorthositic and syenitic rocks, with trace element signatures consistent with a rift origin. Depleted mantle model ages range from 2.29 to 2.57 Ga and Nd values range from +0.7 to -1.7. An increasing crustal component is apparent in rocks with more evolved compositions. Four U-Pb zircon ages (1705.9 0.7, 1709.4 1.4, 1711.1 5.1, and 1713.6 12.7 Ma) indicate a Paleoproterozoic age for the BPRI. These dates constrain the age of the Wernecke Supergroup to ca. 1710 Ma, making it the oldest supracrustal succession in western Laurentia, e.g., >240 Ma older than the Belt Supergroup of southeastern British Columbia and the northwestern United States. The Wernecke Supergroup was deposited in the first rift basin to open along the western margin of Laurentia, but was later inverted by the pre-1.6 Ga Racklan Orogeny, an event possibly influenced by transmission of compression from the Yavapai and Mazatzal orogenies in southern Laurentia. The Neoproterozoic southwestern United States - east Antarctica (SWEAT) reconstruction, which places Australia next to northwestern Laurentia, is supported by linkages between Paleoproterozoic and Mesoproterozoic geological features in northwestern Canada and Australia.

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