Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation

Composite Sunrise Butte pluton: Insights into Jurassic–Cretaceous collisional tectonics and magmatism in the Blue Mountains Province, northeastern Oregon
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Published:December 01, 2015
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CiteCitation
Kenneth Johnson, Joshua J. Schwartz, Jiří Žák, Kryštof Verner, Calvin G. Barnes, Clay Walton, Joseph L. Wooden, James E. Wright, Ronald W. Kistler, 2015. "Composite Sunrise Butte pluton: Insights into Jurassic–Cretaceous collisional tectonics and magmatism in the Blue Mountains Province, northeastern Oregon", Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation, Thomas H. Anderson, Alexei N. Didenko, Cari L. Johnson, Alexander I. Khanchuk, James H. MacDonald, Jr.
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The composite Sunrise Butte pluton, in the central part of the Blue Mountains Province, northeastern Oregon, preserves a record of subduction-related magmatism, arc-arc collision, crustal thickening, and deep-crustal anatexis. The earliest phase of the pluton (Desolation Creek unit) was generated in a subduction zone environment, as the oceanic lithosphere between the Wallowa and Olds Ferry island arcs was consumed. Zircons from this unit yielded a 206Pb/238U age of 160.2 ± 2.1 Ma. A magmatic lull ensued during arc-arc collision, after which partial melting at the base of the thickened Wallowa arc crust produced siliceous magma that was...
- absolute age
- alkaline earth metals
- amalgamation
- Blue Mountains
- Cascade Range
- Cretaceous
- crustal shortening
- crustal thickening
- dates
- deformation
- hafnium
- Hf-177/Hf-176
- intrusions
- ion probe data
- isotope ratios
- isotopes
- Jurassic
- Klamath Mountains
- magmatism
- mass spectra
- Mesozoic
- metals
- metamorphic rocks
- metasedimentary rocks
- nesosilicates
- North America
- North American Cordillera
- O-18/O-16
- Oregon
- orogeny
- orthosilicates
- oxygen
- partial melting
- plate collision
- plate tectonics
- plutons
- rare earths
- SHRIMP data
- Sierra Nevada
- silicates
- spectra
- Sr-87/Sr-86
- stable isotopes
- strontium
- subduction zones
- tectonics
- U/Pb
- United States
- Upper Jurassic
- Wallowa County Oregon
- zircon
- zircon group
- Ingalls Ophiolite
- Sunrise Butte Pluton
- Desolation Creek Unit
- Olds Ferry Island