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Permanent link (DOI): https://doi.org/10.7939/R33N20T6R

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Detrital Zircon Studies in Silurian Basins of Southern New Brunswick Open Access

Descriptions

Other title
Subject/Keyword
Iapetus
geochronology
Appalachian
Ganderia
detrital zircon
Mascarene
Fredericton Trough
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Dokken, Robert J.
Supervisor and department
Waldron, John (Earth and Atmospheric Sciences)
Examining committee member and department
Pearson, Graham (Earth and Atmospheric Sciences)
DuFrane, Scott (Earth and Atmospheric Sciences)
Waldron, John (Earth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2017-05-03T11:38:03Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
The Appalachian orogen in eastern Canada resulted from the Paleozoic convergence of the continents Laurentia and Gondwana during the closure of the intervening Iapetus Ocean. In New Brunswick, the Fredericton Trough and Mascarene Basin were filled in the Silurian within the peri-Gondwanan domain of Ganderia during associated convergence and ocean closure. Detrital zircon geochronological studies demonstrate that the northern formations of the Fredericton Trough were juxtaposed with Laurentia in the early Silurian; however, southern portions of the trough were still separated from Laurentia at this time, indicating the persistence of the Iapetus Ocean. These southern formations record the arrival of Laurentian detritus by the mid-Wenlock, indicating that components of Ganderia were juxtaposed with Laurentia by this time, coinciding with ocean closure. The location of the terminal Iapetan suture, marking the closure of the last portion of Iapetus Ocean, is approximated by the Fredericton Fault, which bisects the trough. Analogous studies in the Mascarene back-arc basin, to the south of the Fredericton Trough, show that it was separated from Laurentia until at least the late Llandovery, and may suggest juxtaposition with a composite Laurentia by 423 ± 1 Ma. These combined results suggest a scenario where Ganderian terranes were successively accreted to Laurentia in the Silurian, as recorded by the progressively increasing extent of Laurentian detritus in juxtaposed terranes.
Language
English
DOI
doi:10.7939/R33N20T6R
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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