High-pressure metamorphism and uplift of the Olympic subduction complex

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1990)018<1252:HPMAUO>2.3.CO;2· OSTI ID:5796581

Brandon, M T; Calderwood, A R ^[1]

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1. Yale Univ., New Haven, CT (USA)

The discovery of the critical assemblage lawsonite + quartz + calcite indicates that a significant part of the Cenozoic Olympic subduction complex of northwestern Washington State formed by underplating at a depth of about 11 km. The deep structural level exposed in this area is attributed to the presence of a 10-km-high arch in the underlying Juan de Fuca plate. The authors postulate that this arch was formed when the southern Cordilleran coastline swung westward as a result of middle Miocene to recent extension in the Basin and Range province.

• OSTI ID: 5796581
• Journal Information: Geology; (USA), Vol. 18:12; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC FORMATIONS
GROUND UPLIFT
METAMORPHISM
WASHINGTON
CALCITE
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
MIOCENE EPOCH
ORIGIN
PLATE TECTONICS
QUARTZ
SUBDUCTION ZONES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
CHALCOGENIDES
FEDERAL REGION X
GEOLOGIC AGES
MINERALS
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
TECTONICS
TERTIARY PERIOD
USA
580000* - Geosciences