Petrology of aluminous schist in the Boehls Butte region of northern Idaho; geologic history and aluminum-silicate phase relations

Carey, J. W.; Rice, Jack M.; Grover, T. W.

doi:10.2475/ajs.292.7.455

Cited by 17 publications

(4 citation statements)

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“…An abundance of inherited zircon in Late Cretaceous Idaho batholith rocks frustrated early attempts to determine crystallization ages. Across the region, the metamorphism in Laurentian rocks is commonly concluded to be a function of magmatic heating during emplacement of the Idaho batholith [ Hietanen , 1962; Lang and Rice , 1985; Barton et al , 1988; Criss and Fleck , 1990; Carey et al , 1992; Grover et al , 1992; House et al , 1997] although crosscutting relationships document postmetamorphic intrusion [ Reid , 1959; Lund , 2004].…”

Section: Settingmentioning

confidence: 99%

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

et al. 2008

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During dextral oblique translation along Laurentia in western Idaho, the Blue Mountains superterrane underwent clockwise rotation and impinged into the Syringa embayment at the northern end of the Salmon River suture. Along the suture, the superterrane is juxtaposed directly against western Laurentia, making this central Cordilleran accretionary‐margin segment unusually attenuated. In the embayment, limited orthogonal contraction produced a crustal wedge of oceanic rocks that delaminated Laurentian crust. The wedge is exposed through Laurentian crust in the Coolwater culmination as documented by mapping and by sensitive high‐resolution ion microprobe U‐Pb, Sri, and ɛNd data for gneisses that lie inboard of the suture. The predominant country rock is Mesoproterozoic paragneiss overlying Laurentian basement. An overlying Neoproterozoic (or younger) paragneiss belt in the Syringa embayment establishes the form of the Cordilleran miogeocline and that the embayment is a relict of Rodinia rifting. An underlying Cretaceous paragneiss was derived from arc terranes and suture‐zone orogenic welt but also from Laurentia. The Cretaceous paragneiss and an 86‐Ma orthogneiss that intruded it formed the wedge of oceanic rocks that were inserted into the Laurentian margin between 98 and 73 Ma, splitting supracrustal Laurentian rocks from their basement. Crustal thickening, melting and intrusion within the wedge, and folding to form the Coolwater culmination continued until 61 Ma. The embayment formed a restraining bend at the end of the dextral transpressional suture. Clockwise rotation of the impinging superterrane and overthrusting of Laurentia that produced the crustal wedge in the Coolwater culmination are predicted by oblique collision into the Syringa embayment.

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Section: Settingmentioning

confidence: 99%

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

et al. 2008

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“…Rhodes [1986] proposed that mylonitization occurred during a prograde increase in temperature and/or pressure. Carey et al [1992] interpreted nearly identical mineral assemblages with similar mineral textures from Boehls Butte, Idaho, as the result of selective replacement of kyanite by andalusite after the growth of fibrolite. We favor the interpretation that the fibrolite grew metastably along these high strain zones while in the andalusite stability field [e.g., Kerrick, 1990].…”

Section: Spokane Dome Mylonite Zonementioning

confidence: 95%

Tectonic evolution of the Priest River complex, northern Idaho and Washington: A reappraisal of the Newport fault with new insights on metamorphic core complex formation

Doughty¹,

Price²

1999

Tectonics

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“…3a) record a polymetamorphic history with peak pressures of approximately 0.6 GPa (Lang & Rice 1985a, b). This assemblage is thrust southward over higher-grade rocks (Lewis 1995) that yield peak pressures in 0.8-1.0 GPa range Grover et al 1992;House et al 1997;Foster et al 2001). Available geochronological and thermochronological data from this portion of the Idaho batholith indicate that metamorphism of this higher-grade section together with the emplacement of deep-level plutons of the northern Idaho batholith occurred at mid-to lower crustal levels during Late Cretaceous time, at approximately 75 Ma (Toth & Stacey 1992).…”

Section: Oblique Ramp System In the Idaho-montana Basementmentioning

confidence: 99%

Displacement transfer between thick- and thin-skinned décollement systems in the central North American Cordillera

McClelland

Oldow

2004

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Late Cretaceous-Early Tertiary contractional deformation along the Cordilleran margin of North America is represented by two distinct styles of foreland deformation, thinskinned and thick-skinned, that primarily differ in depth to their respective basal drcollements. Given the coeval nature of contraction in regions experiencing different styles of deformation, displacement on deep-level detachments associated with thick-skinned basement-cored uplifts in the southern Rocky Mountains was kinematically linked with displacement along shallow-level detachments in the southern Canadian Rockies. In the central North American Cordillera, the transition in foreland drcollement depth was accommodated by a NW-trending oblique ramp system. The oblique ramp extended from the basementcored uplifts of Wyoming along the northern margin of the Idaho batholith to the Shuswap crustal duplex in southeastern British Columbia. While accommodating transfer between differing structural levels, the Late Cretaceous to Paleocene displacement on the oblique ramp produced uplift and exhumation of high-grade metamorphic and plutonic rocks of the Idaho batholith between the NW-striking Lewis and Clark line and the Orofino shear zone. This resulted in truncation of the transpressional western Idaho shear zone, and may have localized the site of Eocene extension in this portion of the Cordillera.

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Petrology of aluminous schist in the Boehls Butte region of northern Idaho; geologic history and aluminum-silicate phase relations

Cited by 17 publications

References 0 publications

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

Tectonic evolution of the Priest River complex, northern Idaho and Washington: A reappraisal of the Newport fault with new insights on metamorphic core complex formation

Displacement transfer between thick- and thin-skinned décollement systems in the central North American Cordillera

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