High-resolution temporal and stratigraphic record of Siletzia's accretion and triple junction migration from nonmarine sedimentary basins in central and western Washington

Michael P. Eddy, Samuel A. Bowring, Paul J Umhoefer, Robert B. Miller, Noah M. McLean, Erin E. Donaghy

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14 Citations (Scopus)

Abstract

The presence of early Eocene neartrench magmatism in western Washington and southern British Columbia has led to speculation that this area experienced ridge-trench interaction during that time. However, the effects of this process as they are preserved in other parts of the geologic record are poorly known. We present highprecision U-Pb zircon geochronology from Paleogene nonmarine sedimentary and volcanic sequences in central and western Washington that preserve a record of tectonic events between ca. 60 and 45 Ma. The data reveal that the Swauk, Chuckanut, and Manastash Formations formed a nonmarine sedimentary basin along the North American margin between ≤59.9 and 51.3 Ma. This basin experienced significant disruption that culminated in basinwide deformation, uplift, and partial erosion during accretion of the Siletzia terrane between 51.3 and 49.9 Ma. Immediately following accretion, dextral strike-slip faulting began, or accelerated, on the Darrington-Devil's Mountain, Entiat, Leavenworth, Eagle Creek, and Straight Creek-Fraser fault zones between 50 and 46 Ma. During this time, the Chumstick Formation was deposited in a strike-slip basin coeval with near-trench magmatism. Faulting continued on the Entiat, Eagle Creek, and Leavenworth faults until a regional sedimentary basin was reestablished ≤45.9 Ma, and may have continued on the Straight Creek-Fraser fault until 35-30 Ma. This record of basin disruption, volcanism, and strike-slip faulting is consistent with ridgetrench interaction and supports the presence of an oceanic spreading ridge at this latitude along the North American margin during the early Eocene.

Original languageEnglish (US)
Pages (from-to)425-441
Number of pages17
JournalBulletin of the Geological Society of America
Volume128
Issue number3-4
DOIs
StatePublished - 2016

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temporal record
triple junction
geological record
sedimentary basin
accretion
faulting
trench
magmatism
Eocene
basin
geochronology
Paleogene
fault zone
terrane
volcanism
zircon
uplift
erosion
tectonics
mountain

ASJC Scopus subject areas

  • Geology

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High-resolution temporal and stratigraphic record of Siletzia's accretion and triple junction migration from nonmarine sedimentary basins in central and western Washington. / Eddy, Michael P.; Bowring, Samuel A.; Umhoefer, Paul J; Miller, Robert B.; McLean, Noah M.; Donaghy, Erin E.

In: Bulletin of the Geological Society of America, Vol. 128, No. 3-4, 2016, p. 425-441.

Research output: Contribution to journalArticle

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