Early Mesozoic paleogeography and tectonic evolution of the western United States: Insights from detrital zircon U-Pb geochronology, Blue Mountains Province, northeastern Oregon

2011 ◽  
Vol 123 (9-10) ◽  
pp. 1939-1965 ◽  
Author(s):  
T. A. LaMaskin ◽  
J. D. Vervoort ◽  
R. J. Dorsey ◽  
J. E. Wright
Keyword(s):  
United States ◽  
Detrital Zircon ◽  
Tectonic Evolution ◽  
Western United States ◽  
Blue Mountains ◽  
Early Mesozoic ◽  
Blue Mountains Province

scholarly journals Detrital zircon provenance of Mesoproterozoic to Cambrian arenites in the western United States and northwestern Mexico

2001 ◽  
Vol 113 (10) ◽  
pp. 1343-1356 ◽  
Author(s):  
John H. Stewart ◽  
George E. Gehrels ◽  
Andrew P. Barth ◽  
Paul K. Link ◽  
Nicholas Christie-Blick ◽  
...  
Keyword(s):  
United States ◽  
Detrital Zircon ◽  
Western United States ◽  
Northwestern Mexico

scholarly journals Evolution of the Late Cretaceous Nanaimo Basin, British Columbia, Canada: Definitive provenance links to northern latitudes

Geosphere ◽  
2021 ◽  
Author(s):  
J. Brian Mahoney ◽  
James W. Haggart ◽  
Marty Grove ◽  
David L. Kimbrough ◽  
Virginia Isava ◽  
...  
Keyword(s):  
United States ◽  
British Columbia ◽  
Late Cretaceous ◽  
Detrital Zircon ◽  
Tectonic Evolution ◽  
Sediment Supply ◽  
Local Source ◽  
Southern Coast ◽  
Coast Mountains ◽  
Belt Supergroup

Accurate reconstruction of the Late Cretaceous paleogeography and tectonic evolution of the west- ern North American Cordilleran margin is required to resolve the long-standing debate over proposed large-scale, orogen-parallel terrane translation. The Nanaimo Basin (British Columbia, Canada) contains a high-fidelity record of orogenic exhumation and basin subsidence in the southwestern Canadian Cordillera that constrains the tectonic evolution of the region. Integration of detrital zircon U-Pb geochronology, conglomerate clast U-Pb geochronology, detrital muscovite 40Ar/39Ar thermochronology, and Lu-Hf isotopic analysis of detrital zircon defines a multidisciplinary provenance signature that provides a definitive linkage with sediment source regions north of the Sierra Nevada arc system (western United States). Analysis of spatial and temporal provenance variations within Nanaimo Group strata documents a bimodal sediment supply with a local source derived from the adjacent magmatic arc in the southern Coast Mountains batholith and an extra-regional source from the Mesoproterozoic Belt Supergroup and the Late Cretaceous Atlanta lobe of the Idaho batholith. Particularly robust linkages include: (1) juvenile (εHf >+10) Late Cretaceous zircon derived from the southern Coast Mountains batholith; (2) a bimodal Proterozoic detrital zircon signature consistent with derivation from Belt Supergroup (1700–1720 Ma) and ca. 1380 Ma plutonic rocks intruding the Lemhi subbasin of central Idaho (northwestern United States); (3) quartzite clasts that are statistical matches for Mesoproterozoic and Cambrian strata in Montana and Idaho (northwestern United States) and southern British Columbia; and (4) syndepositional evolved (εHf >−10) Late Cretaceous zircon and muscovite derived from the Atlanta lobe of the Idaho batholith. These provenance constraints support a tectonic restoration of the Nanaimo Basin, the southern Coast Mountains batholith, and Wrangellia to a position outboard of the Idaho batholith in Late Cretaceous time, consistent with proposed minimal-fault-offset models (<~1000 km).

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