New bedrock mapping highlights the importance of brittle and ductile structure in the tectonics and metallogeny of the eastern Yukon-Tanana Upland, Alaska (poster); Cordilleran Tectonics Workshop, Anchorage, Alaska, February 22-23, 2020

2020 ◽  
Author(s):  
Evan Twelker ◽  
R.J. Newberry ◽  
T.J. Naibert ◽  
Alicja Wypych ◽  
K.R. Sicard ◽  
...  
Keyword(s):  
Cordilleran Tectonics

EVIDENCE FOR SUBDUCTION ALONG THE LEECH RIVER FAULT AND IMPLICATIONS FOR CORDILLERAN TECTONICS

2020 ◽  
Author(s):  
Caroline Seyler ◽  
◽  
James Kirkpatrick ◽  
Alexis Licht ◽  
Dana Šilerová ◽  
...  
Keyword(s):  
Cordilleran Tectonics

DETRITAL ZIRCON STRATIGRAPHY OF PERMIAN TO MIOCENE STRATA FROM DILLON AREA, SW MONTANA, AND IMPLICATIONS FOR REGIONAL CORDILLERAN TECTONICS

2020 ◽  
Author(s):  
Chris M. Baird ◽  
◽  
Megan A. Mueller ◽  
Megan A. Mueller ◽  
Derek Pierce ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Cordilleran Tectonics

scholarly journals U-Pb isotopic ages of euhedral zircons in the Rhaetian of British Columbia: Implications for Cordilleran tectonics during the Late Triassic

Geosphere ◽  
2016 ◽  
Vol 12 (5) ◽  
pp. 1606-1616 ◽  
Author(s):  
M.L. Golding ◽  
J.K. Mortensen ◽  
J.-P. Zonneveld ◽  
M.J. Orchard
Keyword(s):  
British Columbia ◽  
Late Triassic ◽  
Cordilleran Tectonics

The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? II: northern United States and Canada

2021 ◽  
Author(s):  
Robert S. Hildebrand ◽  
Joseph B. Whalen
Keyword(s):  
United States ◽  
High Grade ◽  
North American Cordillera ◽  
Magmatic Arc ◽  
The North ◽  
Peninsular Ranges ◽  
Northern United States ◽  
Back Arc ◽  
Cordilleran Tectonics ◽  
Washington Cascades

The mid-Cretaceous Peninsular Ranges orogeny occurred in the North American Cordillera and affected rocks from Mexico to Alaska. It formed when a marine trough, open for ~35 Myr, closed by westerly subduction beneath a 140-100 Ma arc complex. In Part I we described the features of the orogen in Mexico and California, west to east: back-arc trough, magmatic arc, 140-100 Ma seaway, post-collisional 99-84 Ma granodioritic-tonalitic plutons emplaced into the orogenic hinterland during exhumation, an east-vergent thrust belt, and farther east, a flexural foredeep. In western Nevada, where the Luning–Fencemaker thrust might be a mid-Cretaceous feature, arc and post-collisional plutons occur in proximity. The orogen continues through the Helena salient and Washington Cascades. In British Columbia, rocks of the 130-100 Ma Gambier arc lie west of the exhumed orogenic hinterland and 99-84 Ma post-collisional plutons to collectively indicate westerly subduction. East-dipping reverse faults near Harrison Lake, active from ~100 Ma until ~90 Ma, shed 99-84 Ma debris westward into the Nanaimo back-arc region. Within Insular Alaska, the Early Cretaceous Gravina basinal arc assemblage was deformed at 100 Ma, and flanked to the east by a high-grade hinterland cut by post-collisional plutons. In mainland Alaska, the 100 Ma collision of Wrangellia and the Yukon-Tanana-Farewell composite terrane occurred above a southward-dipping subduction zone as shown by the 130-100 Ma Chisana arc sitting on Wrangellia and southward-dipping, northerly vergent thrusts in the Lower Cretaceous Kahiltna basin to the north. The outboard back-arc region was filled with post-collisional detritus of the McHugh complex.

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