Timing and kinematics of the Duke River fault : insights into the evolution of the Insular Terrane, southwest Yukon
department or school: Science, Faculty of
department or school: Earth, Ocean and Atmospheric Sciences, Department of
data provider: DSpace
degree campus: UBCV
creator: Cobbett, Rose Natalie
issued: 2011-10-21T18:19:48Z
issued: 2011
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The Duke River fault is a terrane-bounding structure that separates the Alexander terrane from Wrangellia in southwest Yukon. Detailed geological mapping and sampling of six key areas along the fault were completed in order to determine the history of movement on the fault. In these areas, the Duke River fault juxtaposes pervasively foliated and folded greenschist facies rocks of the Alexander terrane against low-grade, less deformed Wrangellian rocks. Multiple lines of evidence indicate the Alexander terrane has been thrust over Wrangellia. ⁴⁰Ar/³⁹Ar ages from muscovite grains, which are interpreted to have grown during faulting or have been reset by motions along the Duke River fault, range in age from 82-104 Ma, suggesting that movement along the fault is at least as old as Cretaceous. This mid-to Late Cretaceous event along the Duke River fault is overprinted by brittle deformation that affects rocks as young as Miocene to Pliocene in age and suggests that fault movement has occurred as recently as the Pliocene.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/38156
note: TIMING AND KINEMATICS OF THE DUKE RIVER FAULT; INSIGHTS INTO THE EVOLUTION OF THE INSULAR TERRANE, SOUTHWEST YUKON by ROSE NATALIE COBBETT A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE STUDIES (Geology) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) October 2011 © Rose Natalie Cobbett, 2011 - ii - ABSTRACT The Duke River fault is a terrane‐bounding structure that separates the Alexander terrane from Wrangellia in southwest Yukon. Detailed geological mapping and sampling of six key areas along the fault were completed in order to determine the history of movement on the fault. In these areas, the Duke River fault juxtaposes pervasively foliated and folded greenschist facies rocks of the Alexander terrane against low‐grade, less deformed Wrangellian rocks. Multiple lines of evidence indicate the Alexander terrane has been thrust over Wrangellia. 40Ar/39Ar ages from muscovite grains, which are interpreted to have grown during faulting or have been reset by motions along the Duke River fault, range in age from 82‐104 Ma, suggesting that movement along the fault is at least as old as Cretaceous. This mid‐to Late Cretaceous event along the Duke River fault is overprinted by brittle deformation that affects rocks as young as Miocene to Pliocene in age and suggests that fault movement has occurred as recently as the Pliocene. - iii - TABLE OF CONTENTS Abstract ............................................................................................................................. ii Table of Contents..............................................................................................................iii List of Tables.....................................................................................................................vi List of Figures...................................................................................................................vii Acknowledgements .…
has type: Thesis/Dissertation
date issued: 2011-11
is shown at: 10.14288/1.0053086
language: eng
degree discipline: Geological Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/38156