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journal article Jun 01, 2012

Age and structure of the Crevice pluton: overlapping orogens in west-central Idaho?

Keith D. Gray A. John Watkinson Richard M. Gaschnig Vincent H. Isakson
Canadian Journal of Earth Sciences Vol. 49 No. 6 pp. 709-731 · Canadian Science Publishing
View at Publisher Save 10.1139/e2012-016
Abstract
New U–Pb zircon geochronology from the Riggins region of west-central Idaho refines the timing of contractional deformation across the Salmon River suture zone (SRSZ), a broad north- to northeast-striking belt (>25 km wide) of high strain recording Jura-Cretaceous island-arc–continent collision. Laser ablation – inductively coupled plasma – mass spectrometry (LA–ICP–MS) yields mid-Cretaceous crystallization ages on formerly undated plutonic rocks sampled from the Salmon River canyon. In the Crevice pluton (∼105 Ma), the development of steep to moderate northerly striking gneissic foliation (S1) was followed by tops-to-the-west slip on shallow mylonitic shear zones (S2) and brittle overprinting via systematic joints (Jn) of regional extent. Together, these structures form the pluton’s internal architecture. Subvertical gneissic foliation in the adjacent Looking Glass pluton (∼92 Ma) indicates ductile deformation was ongoing in the Late Cretaceous. Prior to this investigation, penetrative fabrics in local arc volcanogenic, plutonic, and continental rocks have been unequivocally linked to post-collisional dextral transpression on the narrow (<10 km wide) western Idaho shear zone (WISZ). As an alternative to this model which requires spatially overlapping but temporally distinct orogenic belts (WISZ–SRSZ), we consider a protracted history whereby regional synmetamorphic structures accumulated over a pre-118 Ma to post-92 Ma interval without an overprinting orogen-scale ductile shear zone. In our view, a progressive deformation history more accurately accounts for the time-transgressive nature and structural continuity of fabrics observed across the arc–continent transition. This tectonic history proposed for western Idaho may be analogous to other long-lived accretionary margins in the North American Cordillera (e.g., Omineca Belt of southeastern British Columbia).
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Showing 50 of 77 references

Cited By
19
Orogenic link ∼41°N–46°N: Collisional mountain building and basin closure in the Cordillera of western North America

Keith D. Gray, V. Isakson · 2019

Geosphere
Prolonged metamorphism during long-lived terrane accretion: Sm-Nd garnet and U-Pb zircon geochronology and pressure-temperature paths from the Salmon River suture zone, west-central Idaho, USA

Matthew P. McKay, Elizabeth M. Bollen · 2017

Lithosphere
Metrics
19
Citations
77
References
Details
Published
Jun 01, 2012
Vol/Issue
49(6)
Pages
709-731
License
View
Authors
K
Keith D. Gray

School of Earth & Environmental Sciences, Washington State University, Pullman, WA, 99164-2812, USA

A
A. John Watkinson

School of Earth & Environmental Sciences, Washington State University, Pullman, WA, 99164-2812, USA

R
Richard M. Gaschnig

School of Earth & Environmental Sciences, Washington State University, Pullman, WA, 99164-2812, USA

V
Vincent H. Isakson

School of Earth & Environmental Sciences, Washington State University, Pullman, WA, 99164-2812, USA

Cite This Article
Keith D. Gray, A. John Watkinson, Richard M. Gaschnig, et al. (2012). Age and structure of the Crevice pluton: overlapping orogens in west-central Idaho?. Canadian Journal of Earth Sciences, 49(6), 709-731. https://doi.org/10.1139/e2012-016
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