Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path
Shortly after amalgamation of Archean cratons in Laurentia, ca. 1.9-1.8 Ga, its global paleogeographic position and sense of plate motion remains uncertain. Critical review of existing paleomagnetic data through this interval demonstrates that only a few results pass stringent reliability filters as...
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Yale University
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ftproquest:oai:pqdtoai.proquest.com:3317272 2023-05-15T15:35:52+02:00 Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path Raub, Theresa M. D. 2008-01-01 00:00:01.0 http://pqdtopen.proquest.com/#viewpdf?dispub=3317272 ENG eng Yale University http://pqdtopen.proquest.com/#viewpdf?dispub=3317272 Geology|Geophysics thesis 2008 ftproquest 2021-03-13T17:39:32Z Shortly after amalgamation of Archean cratons in Laurentia, ca. 1.9-1.8 Ga, its global paleogeographic position and sense of plate motion remains uncertain. Critical review of existing paleomagnetic data through this interval demonstrates that only a few results pass stringent reliability filters as "key poles." New paleomagnetic sampling from Dubawnt Supergroup throughout Baker Lake Basin, Nunavut, Canada, spans ∼1.84-1.68 Ga, including Baker Lake Group, Wharton Group, and Barrensland Group (Thelon Formation) with specific attention to precisely dated units. These ∼1200 samples provide seven new poles and several additional new virtual geomagnetic poles for Laurentia during that interval. Positive conglomerate tests and a positive baked-contact test establish five of these new results as primary, while numerous other field tests constrain the history and pattern of partial remagnetizing overprints throughout Baker Lake Basin, and indicate promising directions for future research. The apparent polar wander path for Laurentia at 1840-1675 Ma, as defined by the new results of this thesis, supports previously published low-latitude poles and suggests a change in direction of motion for Laurentia ca. 1810 Ma, during waning stages of the Hudsonian orogeny. These results permit intriguing paleogeographic connections with other late Paleoproterozoic cratons such as Australia, Baltica, and North China. Thesis Baker Lake Nunavut PQDT Open: Open Access Dissertations and Theses (ProQuest) Nunavut Canada Wharton ENVELOPE(157.817,157.817,-81.050,-81.050) |
institution |
Open Polar |
collection |
PQDT Open: Open Access Dissertations and Theses (ProQuest) |
op_collection_id |
ftproquest |
language |
English |
topic |
Geology|Geophysics |
spellingShingle |
Geology|Geophysics Raub, Theresa M. D. Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
topic_facet |
Geology|Geophysics |
description |
Shortly after amalgamation of Archean cratons in Laurentia, ca. 1.9-1.8 Ga, its global paleogeographic position and sense of plate motion remains uncertain. Critical review of existing paleomagnetic data through this interval demonstrates that only a few results pass stringent reliability filters as "key poles." New paleomagnetic sampling from Dubawnt Supergroup throughout Baker Lake Basin, Nunavut, Canada, spans ∼1.84-1.68 Ga, including Baker Lake Group, Wharton Group, and Barrensland Group (Thelon Formation) with specific attention to precisely dated units. These ∼1200 samples provide seven new poles and several additional new virtual geomagnetic poles for Laurentia during that interval. Positive conglomerate tests and a positive baked-contact test establish five of these new results as primary, while numerous other field tests constrain the history and pattern of partial remagnetizing overprints throughout Baker Lake Basin, and indicate promising directions for future research. The apparent polar wander path for Laurentia at 1840-1675 Ma, as defined by the new results of this thesis, supports previously published low-latitude poles and suggests a change in direction of motion for Laurentia ca. 1810 Ma, during waning stages of the Hudsonian orogeny. These results permit intriguing paleogeographic connections with other late Paleoproterozoic cratons such as Australia, Baltica, and North China. |
format |
Thesis |
author |
Raub, Theresa M. D. |
author_facet |
Raub, Theresa M. D. |
author_sort |
Raub, Theresa M. D. |
title |
Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
title_short |
Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
title_full |
Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
title_fullStr |
Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
title_full_unstemmed |
Paleomagnetism of Dubawnt Supergroup, Baker Lake Basin, Nunavut, Canada: Refining Laurentia's Paleoproterozoic apparent polar wander path |
title_sort |
paleomagnetism of dubawnt supergroup, baker lake basin, nunavut, canada: refining laurentia's paleoproterozoic apparent polar wander path |
publisher |
Yale University |
publishDate |
2008 |
url |
http://pqdtopen.proquest.com/#viewpdf?dispub=3317272 |
long_lat |
ENVELOPE(157.817,157.817,-81.050,-81.050) |
geographic |
Nunavut Canada Wharton |
geographic_facet |
Nunavut Canada Wharton |
genre |
Baker Lake Nunavut |
genre_facet |
Baker Lake Nunavut |
op_relation |
http://pqdtopen.proquest.com/#viewpdf?dispub=3317272 |
_version_ |
1766366209751646208 |