Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Provenance variations in Northern Appalachian Avalonia based on detrital zircon age patterns in Ediacaran and Cambrian sedimentary rocks, New Brunswick and Nova Scotia, Canada

S. M. Barr, M. A. Hamilton, S. D. Samson, A. M. Satkoski and C. E. White
Provenance variations in Northern Appalachian Avalonia based on detrital zircon age patterns in Ediacaran and Cambrian sedimentary rocks, New Brunswick and Nova Scotia, Canada
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (March 2012) 49 (3): 533-546

Abstract

Avalonia in the northern Appalachian orogen is generally assumed to have originated near the margin of Gondwana, although its position along that extensive margin and the timing of its separation remain disputed. U-Pb ages determined by laser ablation - inductively coupled plasma - mass spectrometry are reported here for detrital zircon from Avalonian clastic sedimentary units, three in southern New Brunswick, and one in southeastern Cape Breton Island, with depositional ages ranging from ca. 630 to ca. 505 Ma. Considered in combination with previously published detrital data sets from two other samples from southern New Brunswick deposited in a similar age range, the samples show a wide spectrum of ages from Ediacaran to Neoarchean (as old as 3.2 Ga). The dominant zircon populations in all six samples are Ediacaran-Cryogenian with ages between 770 and 540 Ma and can be matched with known magmatic events in Avalonia. Pre-Avalonian cycle detrital zircon dates in the samples are relatively sparse and do not reveal a consistent signature that might be used to place Avalonia in a unique paleogeographic position, although they are compatible with Amazonian provenance. An increase in ca. 2.2-1.9 Ga zircon dates in Early Cambrian through Early Ordovician samples suggests that sources for zircon of those ages became available in Avalonia by the end of the Ediacaran, possibly by motion of Avalonia to a different part of the Amazonian margin or to the West African craton.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 49
Serial Issue: 3
Title: Provenance variations in Northern Appalachian Avalonia based on detrital zircon age patterns in Ediacaran and Cambrian sedimentary rocks, New Brunswick and Nova Scotia, Canada
Affiliation: Acadia University, Department of Earth and Environmental Science, Wolfville, NS, Canada
Pages: 533-546
Published: 201203
Text Language: English
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 68
Accession Number: 2012-050191
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N45°30'00" - N47°00'00", W61°30'00" - W59°30'00"
N45°00'00" - N48°04'60", W69°00'00" - W63°45'00"
Secondary Affiliation: University of Toronto, CAN, CanadaSyracuse University, USA, United StatesNova Scotia Department of Natural Resources, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201226
Close Modal

or Create an Account

Close Modal
Close Modal