Stratigraphic, sedimentologic, and petrologic record of late Miocene subsidence of the central Oregon High Cascades
Journal Article
·
· Geology; (United States)
Pliocene to Holocene volcanics of the central Oregon High Cascades, largely confined to an intra-arc graben, bury older volcanic centers. Early High Cascade volcanism is recorded by late Miocene volcanics and sediments of the Deschutes formation that accumulated in a fluvial basin east of the Cascades. Aggradation in the adjacent fluvial basin occurred episodically when pyroclastic debris choked streams. Deschutes basin aggradation commenced near 7.4 Ma and was synchronous with extension-influenced Cascade magmatism dominated by basalts and basaltic andesites. Initial subsidence of the Cascades occurred at about 5.4 Ma in response to plate-margin processes. Structural isolation of the basin from ignimbrites and volcanism-induced sedimentation resulted in widespread development of superimposed paleosols in the basin. Subsequent mafic lavas erupted near the eastern margin of the initial depression were truncated by east-stepping, down-to-the-west faults at about 5.3 Ma.
- Research Organization:
- Oregon State Univ., Corvallis (USA)
- OSTI ID:
- 5237276
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 15:5; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stratigraphy, sedimentology and petrology of neogene rocks in the Deschutes Basin, Central Oregon: a record of continental-margin volcanism and its influence on fluvial sedimentation in an arc-adjacent basin
Evolution of volcaniclastic apron during initiation of Cascade volcanism in southern Oregon
Tectonic significance of bimodal volcanism in the Archean Michipicoten greenstone belt, Ontario
Technical Report
·
Tue Jul 01 00:00:00 EDT 1986
·
OSTI ID:5216792
Evolution of volcaniclastic apron during initiation of Cascade volcanism in southern Oregon
Conference
·
Thu May 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:5443470
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Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6070229
Related Subjects
58 GEOSCIENCES
580202 -- Geophysics-- Volcanology-- (1980-1989)
580202* -- Geophysics-- Volcanology-- (1980-1989)
AGE ESTIMATION
CASCADE MOUNTAINS
CENOZOIC ERA
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
IGNEOUS ROCKS
LAVA
MIOCENE EPOCH
MOUNTAINS
NORTH AMERICA
OREGON
PETROLOGY
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
TECTONICS
TERTIARY PERIOD
USA
VOLCANIC REGIONS
VOLCANIC ROCKS
580202 -- Geophysics-- Volcanology-- (1980-1989)
580202* -- Geophysics-- Volcanology-- (1980-1989)
AGE ESTIMATION
CASCADE MOUNTAINS
CENOZOIC ERA
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
IGNEOUS ROCKS
LAVA
MIOCENE EPOCH
MOUNTAINS
NORTH AMERICA
OREGON
PETROLOGY
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
TECTONICS
TERTIARY PERIOD
USA
VOLCANIC REGIONS
VOLCANIC ROCKS