Paleomagnetic study of the late Neoproterozoic Bull Arm and Crown Hill formations (Musgravetown Group) of eastern Newfoundland: implications for Avalonia and West Gondwana paleogeography1This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.-Reference-Cited by-同舟云学术

Paleomagnetic study of the late Neoproterozoic Bull Arm and Crown Hill formations (Musgravetown Group) of eastern Newfoundland: implications for Avalonia and West Gondwana paleogeography1This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

Published:2012-01 Issue:1 Volume:49 Page:308-327
ISSN:0008-4077
Container-title:Canadian Journal of Earth Sciences
language:en
Short-container-title:Can. J. Earth Sci.

Author:

Pisarevsky Sergei A.¹,McCausland Phil J.A.²,Hodych Joseph P.³,O’Brien Sean J.⁴,Tait Jennifer A.⁵,Murphy J. Brendan⁶

Affiliation:

1. School of Earth and Environment (M004), University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia; School of Geosciences, University of Edinburgh, Edinburgh, EH9 3JW, Scotland; Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.

2. Department of Earth Sciences, The University of Western Ontario, London, ON N6A 5B7, Canada.

3. Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL A1B 3X5, Canada.

4. Geological Survey of NL, Department of Natural Resources, P.O. Box 8700, St. John’s, NL A1B 4J6, Canada.

5. School of Geosciences, University of Edinburgh, Edinburgh, EH9 3JW, Scotland.

6. Department of Earth Sciences, St. Francis Xavier University, P.O. Box 5000, Antigonish, NS B2G 2W5, Canada.

Abstract

A paleomagnetic study of subaerial volcanic rocks and associated siltstones of the Ediacaran Bull Arm Formation in the Avalon Zone of Newfoundland revealed a stable bipolar, hematite-borne primary remanence supported by positive conglomerate, contact, and fold tests. Mean remanence directions in two distal areas (Bonavista and Argentia) are similar, indicating a low paleolatitude position of Avalonia at ∼570 Ma. Redbeds of the overlying ∼550 Ma Crown Hill Formation also carry a primary bipolar hematite-borne remanence with moderate inclination, indicating that Avalonia remained at low to medium paleolatitudes through the end of the Ediacaran. Combining our results with previously published paleomagnetic data of Avalonia suggests moderate-scale drift of Avalonia through low southern paleolatitudes through the latter half of the Ediacaran, providing a paleogeographic context for the development of the first complex metazoan life.

Publisher

Canadian Science Publishing

Subject

General Earth and Planetary Sciences

Link

http://www.nrcresearchpress.com/doi/pdf/10.1139/e11-045

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