modifying the coast transform motion. our story so far… animated cordillera animated cordillera -...
Post on 22-Dec-2015
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![Page 1: Modifying the Coast Transform Motion. Our Story So Far… Animated Cordillera Animated Cordillera - James Sears](https://reader038.vdocuments.us/reader038/viewer/2022110207/56649d7e5503460f94a61374/html5/thumbnails/1.jpg)
Modifying the Coast
Transform Motion
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Our Story So Far…
Animated Cordillera - James Sears
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Question stillin debate…
Where did the Insular Terrane
actually accrete to North America?
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Intermontaine ST
Insular ST
N. Cascades
Present Day
WA State
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Two Hypotheses
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Intermontaine ST
Insular ST &N. Cascades
Hypothesis Aat 90 Myrs
Hypothesis Bat 90 Myrs
WA State
Baja BCHypothesis
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Baja BC85 Myrs
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Baja BC80 Myrs
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Baja BC70 Myrs
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Baja BC60 Myrs
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Main Evidence for Baja BCPaleomagnetics of Mt. Stuart Batholith
Mt. Stuart90 Myrs30° inclination
Eocene Volc.Rocks<55 Myrs45° inclination(Modern lat.)
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Other Evidence:Sediment Provenance
Inconclusive - needs more study
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Source A
Source B
What do the overlapping
sedimentary rocks tell us?
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Other Evidence:Fossils
What do the fossils tell us?
New study - not yet
published
Supports Baja BC
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Other Evidence:Plate Tectonic Reconstructions
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Supports Baja BC
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However - there are problems…
1. No major faults discovered
2. Sedimentary rocks around the batholith are tilted…could it be tilted, too?
The Question Remains Unanswered…
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Post-Insular Plate Tectonics
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Graphics by Steve Dutch - U of Wisconsin
D-2
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80Myr: Formation of the Kula Plate
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D-2
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55 Myrs
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D-2
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40 Myrs
D-2
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30 Myrs
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D-2
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20 Myrs
D-2
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Present
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D-2
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Major Events of the Cenozoic
65
55
45
35
25
15
0
5
Age (Myrs)
Straight CreekTransform Fault
WesternCascade Arc
Challis Arc
High Cascade Arc
Columbia River Basalts
Formation ofOlympic Rocks
Accretion ofOlympic Rocks
MajorSedimentaryBasins
Volcanism Tectonics Olympics Sedimentary Events
Ice Ages