Ophiolites, Arcs, and Batholiths: A Tribute to Cliff Hopson

The Ingalls ophiolite complex, central Cascades, Washington: Geochemistry, tectonic setting, and regional correlations
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Published:July 01, 2008
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James H MacDonald, Jr., Gregory D Harper, Robert B Miller, Jonathan S Miller, Ante N Mlinarevic, Cynthia E Schultz, 2008. "The Ingalls ophiolite complex, central Cascades, Washington: Geochemistry, tectonic setting, and regional correlations", Ophiolites, Arcs, and Batholiths: A Tribute to Cliff Hopson, James E. Wright, John W. Shervais
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The polygenetic Ingalls ophiolite complex in the central Cascades, Washington, is one of several Middle to Late Jurassic ophiolites of the North American Cordillera. It consists primarily of mantle tectonites. High-temperature mylonitic peridotite, overprinted by serpentinite mélange (Navaho Divide fault zone), separates harzburgite and dunite in the south from lherzolite in the north. Crustal units of the ophiolite occur as steeply dipping, kilometer-scale fault blocks within the Navaho Divide fault zone. These units are the Iron Mountain, Esmeralda Peaks, and Ingalls sedimentary rocks.
Volcanic rocks of the Iron Mountain unit have transitional within-plate–enriched mid-ocean-ridge basalt affinities, and a rhyolite yields...
- absolute age
- basalts
- Cascade Range
- Cenozoic
- Chumstick Formation
- correlation
- crust
- dates
- Eocene
- fault zones
- faults
- geochemistry
- harzburgite
- igneous rocks
- Invertebrata
- Jurassic
- lithostratigraphy
- Lower Jurassic
- major elements
- melange
- Mesozoic
- metaigneous rocks
- metamorphic rocks
- metasomatic rocks
- microfossils
- mid-ocean ridge basalts
- oceanic crust
- ophiolite
- ophiolite complexes
- Paleogene
- peridotites
- plate tectonics
- plutonic rocks
- Protista
- Radiolaria
- sea-floor spreading
- serpentinite
- spreading centers
- Swauk Formation
- tectonics
- Tertiary
- trace elements
- U/Pb
- ultramafics
- United States
- volcanic rocks
- Washington
- Chiwaukum Schist
- Mount Stuart Batholith
- Ingalls Complex
- Iron Mountain Unit
- De Roux Unit
- Esmeralda Peaks Unit
- Navaho Divide fault zone