Did Westward Subduction Cause Cretaceous-Tertiary Orogeny in by Robert S. Hildebrand

By Robert S. Hildebrand

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Additional resources for Did Westward Subduction Cause Cretaceous-Tertiary Orogeny in the North American Cordillera? (Special Paper (Geological Society of America))

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Both Colorado Plateau and Laramide thick-skinned deformation terminate on the south at the Phoenix fault. AV—Adel volcanics; ATL—Atlanta lobe of Idaho batholith; BIT— Bitterroot lobe of Idaho batholith; BM-W—Blue Mountain–Wallowa terranes; C—Carmacks volcanics; EV—Elkhorn Mountain volcanics; JM—Judith Mountains; K—Kootenay terrane; LR—Little Rocky Mountains; M—McCoy Mountains Formation; MC—Monashee complex; N—Nisling terrane; RMA—Roberts Mountain allochthon; SJ— San Juan volcanic field; SZ—shear zone.

Even a cursory glance at the geological map of western North America (Figs. , 2007)—whereas the contemporaneous postcollisional, slab failure magmatic rocks of Canada generally don’t occur much south of it. This, and their temporal overlap, suggest a causal relationship. Perhaps the subducting oceanic slab was segmented, and the transform transected the edge of the craton at the site of the Montana transform. When the slab failed, it would then have been possible to have different thicknesses of lithospheric mantle on either side of the transform.

U S A na da Ca S m tfor n k i i S t i Qu a Co as lu tP to ni c m Co pl Va o nc uv es er ll i ex Is C r e ek of a Columbia Triangle rz o sh ne el el l Canadian Segment e BM alt ea ay sh en ino e ba s Or ne Miocen C C ot Ko O Sylvester allochthon sm am at t Range volcanics pla ra on 3 M a Co as ti agma Ma m Late Cretaceous early Tertiary slab break-off plutons he 7 53– 4 i ll e limit of Cord rb 6 ar ssi te r n br ca i an 0– 5 C a r m a ck s Cac ea s nt s wisz n F. ali F. n te t us hr BIT al lis L&C rc Pu AT L Ca i ma ed tBel h De ina basi ro x f ge nic a rc A pp t h B BB US A Cana da Montana Alkalic Province Kamloops Challis Absoraka 5 3–4 5 M a Cl ar n Y s Ab or aka P a c C nt Ti el n wy o r m r a scad e v olca N A e i c n A 120–80 Ma batholiths ?

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