Explore the geological wonders of the North Cascades in this comprehensive lecture on the Eocene Crystalline Core. Delve into the formation and characteristics of the Skagit Gneiss, understanding its plutonic origins and the processes that shaped it. Learn about crustal thickness, strike-slip faults, and the restoration of the Straight Creek Fault. Discover pressure and depth indicators in the Skagit Gneiss, including the role of garnets and zircon age dating. Examine field photos and gain insights into fast exhumation through cordierite analysis. Compare the deformation of upper and deeper crust, and explore other core complexes. Engage with a Q&A session and preview upcoming topics. Conclude with a discussion on the Roadside Geology of Washington, offering a practical application of the lecture's content.
Overview
Syllabus
Video Start
Lecture Start
Skagit Gneiss Used to be Plutonic Rocks
Boulder Batholith 9km Uplift
How old was the plutonic material that made the Skagit Gneiss?
North Cascade - Crustal Thickness
Schedule and Eocene Papers
Dream Team Photos and Videos
How do we know the original depth and pressure of the Skagit Gneiss?
Washington Strike Slip Faults
Crystalline Core Blocks
Straight Creek Fault Restoration
Stacia Gordon
Skagit Gneiss Locations
Previous Research
Skagit Gneiss Pressure and Depth Indicators
Garnets
Zircon Age Dating
Field Photos
Cordierite Shows Fast Exhumation
Other Age Dating Methods
Crystalline Core and Sedimentary Basins
Upper Crust vs Deeper Crust Deformation
Other Core Complexes
Q&A
Next Session Preview
Roadside Geology of Washington
Toast and Goodbye
Taught by
Nick Zentner
