The Growth of Western North America - Part II The Insular Superterrane, North Cascades & San Juan Islands.

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Presentation transcript:

The Growth of Western North America - Part II The Insular Superterrane, North Cascades & San Juan Islands

Our Story So Far… C-3

Arrival of the Insular Superterrane Intermontaine Superterrane Insular Superterrane Methow Basin C-3

Intermontaine Superterrane Insular Superterrane Methow Basin North Cascades After Accretion Subduction zone relocates

North Cascades at 100 Myrs

Insular Superterane: Wrangellia Terrane Rocks: Basalts top: vesicles bottom: pillows Limestone Age: Triassic/Jurassic Source: Fossil clams and forams western Pacific Paleomagnetics ±15° N/S Type of Terrane: Hot Spot Islands Photo: Dr. ML.Bevier

Oblique Collision Continent Terrane

Oblique Collision Continent

Oblique Collision Continent

Oblique Collision Continent Terrane is “smeared out” along coast

Insular Superterrane: Wrangellia C-2

Wrangellia & the North Cascades C-6 Intermontaine Superterrane Insular Superterrane Methow Basin “Microterranes”

Modern Day Analogy for North Cascade Rocks

Cont. C-6 Intermontaine Superterrane Insular Superterrane North Cascades & San Juan Islands Time

Many Microterranes of the North Cascades & San Juan Is. (See list on C-9) C-4 Skagit Chelan Mountains Nason Shuksan Nooksak River Chilliwack Haro Turtleback Deadman Bay Garrison Decatur Western Melange Eastern Melange …and the rest…

Major Terrane Groupings Skagit Chelan Mountains Nason Shuksan Nooksak River Chilliwack Haro Turtleback Deadman Bay Garrison Decatur Western Melange Eastern Melange …and the rest… Skagit Crystalline Core NW Cascades and San Juan Thrust System Melanges

Major Terrane Groupings C-4 Skagit Crystalline Core NW Cascades and San Juan Thrust System Melanges

Skagit Crystalline Core Skagit Gneiss Cascade River Schist High Grade

NW Cascades Thrusts Darrington Phyllite Shuksan Blueschist Protolith: Shale Protolith: Basalt Chilliwack Marble -- Subducted Ocean Crust -- Low to Medium Grade

Twin Sisters Dunite

Major Terrane Groupings Skagit Crystalline Core NW Cascades and San Juan Thrust System Melanges High Grade Met. Medium Grade Met. Low Grade Met. C-4

Skagit Crystalline Core NW Cascades & San Juan Islands Thrusts Separated by thrust faults C-5 & 6

San Juan Islands C-7

San Juan Islands C-7 Decatur Terrane Jurassic Chert Basalt Gabbro Serpentinite Ocean Crust Similar to Terrane rocks in Northern California

San Juan Islands C-7 Deadman Bay Terrane Permian to Jurassic Chert Limestone W/Tethyan Forams Basalt Ocean Crust Similar to Cache Creek Terrane in Intermontaine Superterrane

San Juan Thrust Sheets C-7

San Juan Island Thrust Sheets C-8

NW Cascades/San Juan Islands C-5

Nanaimo Formation: Overlap Sequence

Mt. Stuart - Stitching Pluton 90 Myrs

Timing of the North Cascades Collision C-1 Age of the Microterranes Age of Accretion Myrs

C-10 Meanwhile in Oregon…

Terranes of the Wallowa Mountains C-11

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