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Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes; significance for breakup events within Canada and adjacent regions from 2.5 Ga to the present

Richard Ernst and Wouter Bleeker
Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes; significance for breakup events within Canada and adjacent regions from 2.5 Ga to the present (in Lithoprobe; parameters, processes, and the evolution of a continent, Volume 2--Lithoprobe; parametres, processus et l'evolution d'un continent, Volume 2, Ronald Clowes (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (May 2010) 47 (5): 695-739

Abstract

Large igneous provinces (LIPs) are high volume, short duration pulses of intraplate magmatism consisting mainly of flood basalts and their associated plumbing system, but also may include silicic components and carbonatites. Many LIPs have an associated radiating diabase dyke swarm, which typically converges on a cratonic margin, identifies a mantle plume centre, and is linked to breakup or attempted breakup to form that cratonic margin. We hypothesize that every major breakup margin in Canada can be associated with a LIP, and we attempt to identify this LIP. To this end, we focus mainly on high-precision age determinations and the distribution of diabase dyke swarms, which are uniquely valued for preserving the record of magmatic events. The analysis extends from the Phanerozoic to the Neoarchean, but our most complete information is for the Superior craton. There, events at 2.50-2.45, 2.22-2.17, and 2.12-2.08 Ga (LIP and plume) are linked with rifting and breakup or attempted breakup of the south-southeastern, northeastern, and southern margins, respectively. Events at 2.00-1.97 Ga are probably linked with the northern margin (Ungava promontory), while the Circum-Superior event at ca. 1.88 Ga is linked to the north to northwestern margins during a time of Manikewan Ocean closure. Similar linkages for other cratons of North America improve understanding of the breakup history to help identify which blocks were nearest neighbours to Canadian crustal blocks in Precambrian supercontinents. Such interpretations provide a framework for interpreting other geological features of these margins to further test models for the timing and location of breakup.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 47
Serial Issue: 5
Title: Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes; significance for breakup events within Canada and adjacent regions from 2.5 Ga to the present
Title: Lithoprobe; parameters, processes, and the evolution of a continent, Volume 2--Lithoprobe; parametres, processus et l'evolution d'un continent, Volume 2
Author(s): Ernst, RichardBleeker, Wouter
Author(s): Clowes, Ronaldeditor
Affiliation: Ernst Geosciences, Ottawa, ON, Canada
Affiliation: University of British Columbia, Department of Earth & Ocean Sciences, Vancouver, BC, Canada
Pages: 695-739
Published: 201005
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 266
Accession Number: 2010-083162
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. charts, 11 tables, geol. sketch maps
N62°00'00" - N69°00'00", W117°00'00" - W105°00'00"
N46°00'00" - N61°40'00", W99°00'00" - W66°00'00"
N58°00'00" - N62°30'00", W78°00'00" - W69°00'00"
Secondary Affiliation: Geological Survey of Canada, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201044
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