Mantle-Derived Peridotites in Southwestern Oregon: Relation to Plate Tectonics

Mantle-Derived Peridotites in Southwestern Oregon: Relation to Plate Tectonics

A group of peridotites in southwestern Oregon contains high-pressure mineral assemblages reflecting recrystallization at high temperatures (1100 ° to 1200°C) over a range of pressure decreasing from 19 to 5 kilobars. It is proposed that the peridotites represent upper-mantle material brought from de...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Science (American Association for the Advancement of Science) 1970-09, Vol.169 (3949), p.971-974
Hauptverfasser: Medaris, L. G., Dott, R. H.
Format: Artikel
Sprache:eng
Schlagworte:
Geology
High temperature
Lithospheres
Peridotite
Plate tectonics
Pyroxenes
Recrystallization
Rocks
Schist
Spinel
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:A group of peridotites in southwestern Oregon contains high-pressure mineral assemblages reflecting recrystallization at high temperatures (1100 ° to 1200°C) over a range of pressure decreasing from 19 to 5 kilobars. It is proposed that the peridotites represent upper-mantle material brought from depth along the ancestral Gorda-Juan de Fuca ridge system, transported eastward by the spreading Gorda lithosphere plate, and then emplaced by thrust-faulting in the western margin of the Cordillera during late Mesozoic time.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.169.3949.971