Provenance constraints on Early Jurassic evolution of the northern Stikinian arc : Laberge Group, Whitehorse Trough, northwestern British Columbia
department or school: Science, Faculty of
department or school: Earth, Ocean and Atmospheric Sciences, Department of
data provider: DSpace
degree campus: UBCV
creator: Johannson, Gary G.
issued: 2009-01-10T01:12:58Z
issued: 1994
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The Lower to Middle Jurassic Inklin Formation forms part of the Laberge Group in northwestern B.C. which links the Stikine and Cache Creek terranes along much of the length of the Whitehorse Trough. Ammonite biochronology of the Inklin Formation in the Atlin Lake area constrain the age of the succession there to a range of Early Sinemurian to Late Pliensbachian and provide the temporal framework for analyzing petrofacies and interpreting basin history using paleocurrent data, ternary plots, and conglomerate clast age and provenance. Inklin Formation sediments record a complex arc-basin evolution during the Early Jurassic characterized by episodic flank uplifts, rejuvenated volcanism, and strike-slip influence on sedimentation. Strong temporal trends in both paleocurrent patterns and sandstone-conglomerate petrofacies are evident and allow definition of three discrete phases in basin-fill history. QFL, QmPK, and QpLvLs sandstone ternary plots, conglomerate clast trends and provenance, paleocurrent patterns and measured sections together indicate a regime of stable tectonics characterized by relative volcanic quiescence and low sedimentation rates prevailed through most or all of the Sinemurian. Sinemurian sandstone and conglomerate petrofacies record a transitional arc provenance derived from an older volcanic pile, flanking coastal sediments, and arc roots to the southwest. Progressive incision of the Late Triassic arc initiated in latest Triassic or earliest Jurassic time transported predominantly Upper Triassic elastics of mixed volcanoplutonic and sedimentary provenance initially eastward into the basin via turbidity currents where sediments were dispersed in a generally northwesterly direction, reflecting longitudinal fan-systems prograding north/northwesterly along the axial trend of the basin. Pliensbachian petrofacies record two episodes of distinct provenance and indicate the establishment of a new sedimentation regime. Lower Pliensbachian sandstone and cong…
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note: P R O V E N A N C E C O N S T R A I N T S O N E A R L Y J U R A S S I C E V O L U T I O N O F T H E N O R T H E R N S T I K I N I A N A R C : L A B E R G E G R O U P , W H I T E H O R S E T R O U G H , N O R T H W E S T E R N B R I T I S H C O L U M B I A by G A R Y G . J O H A N N S O N B . S c , The University of British Columbia, 1991 A THESIS S U B M I T T E D IN P A R T I A L F U L F I L L M E N T O F T H E R E Q U I R E M E N T S F O R T H E D E G R E E O F M A S T E R O F S C I E N C E in T H E F A C U L T Y O F G R A D U A T E S T U D I E S D E P A R T M E N T O F G E O L O G I C A L S C I E N C E S We accept this thesis as conforming to the required standard T H E U N I V E R S I T Y O F BRITISH C O L U M B I A October 1994 © G a r y G . Johannson, 1994 In presenting t h i s thesis i n p a r t i a l f u l f i l l m e n t of the requirements for an advanced degree at the University of B r i t i s h Columbia, I agree that the Library s h a l l make i t f r e e l y a v a i l a b l e for reference and study. I further agree that permission for extensive copying of t h i s thesis for scholarly purposes may be granted by the head of my department or by h i s or her representatives. I t i s understood that copying or pub l i c a t i o n of t h i s thesis for f i n a n c i a l gain s h a l l not be allowed without my written permission. Department of C-^rWrrJ ^o^^rOh The University of B r i t i s h Columbia Vancouver, Canada u A B S T R A C T The Lower to Middle Jurassic Inklin Formation forms part of the Laberge Group in northwestern B.C. which links the Stikine and Cache Creek terranes along much of the length of the Whitehorse Trough. Ammonite biochronology of the Inklin Formation in the Atlin Lake area constrain the age of the succession there to a range of Early Sinemurian to Late Pliensbachian and provide the temporal framework for analyzing petrofacies and interpreting basin history using paleocurrent data, ternary plots, and conglomerate clast age and prove…
has type: Thesis/Dissertation
date issued: 1995-05
is shown at: 10.14288/1.0052494
language: eng
degree discipline: Geological Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/3524