scholarly journals Detrital zircon U-Pb geochronology and Hf isotope geochemistry of the Roberts Mountains allochthon: New insights into the early Paleozoic tectonics of western North America

Geosphere ◽  
2016 ◽  
Vol 12 (3) ◽  
pp. 1016-1031 ◽  
Author(s):  
Gwen M. Linde ◽  
James H. Trexler ◽  
Patricia H. Cashman ◽  
George Gehrels ◽  
William R. Dickinson
Keyword(s):  
North America ◽  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Western North America ◽  
Early Paleozoic

scholarly journals Supplemental material: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Paleozoic and Triassic passive margin strata of western North America

2013 ◽  
Author(s):  
George Gehrels ◽  
Mark Pecha
Keyword(s):  
North America ◽  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
File Size ◽  
Image File ◽  
Supplemental File

Geosphere, February 2014, v. 10, p. 49-65, doi:10.1130/GES00889.1, Supplemental File 2 - CL image file (238 pages). File size is ~23 MB.

scholarly journals Supplemental material: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Paleozoic and Triassic passive margin strata of western North America

2013 ◽  
Author(s):  
George Gehrels ◽  
Mark Pecha
Keyword(s):  
British Columbia ◽  
North America ◽  
Detrital Zircon ◽  
Southern California ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
Standard Data ◽  
Data Table

Geosphere, February 2014, v. 10, p. 49-65, doi:10.1130/GES00889.1, Supplemental Tables - Zipped file containing 13 Excel table files. Table 1: Alaska U-Pb data. Table 2: Northern British Columbia U-Pb data. Table 3: Southern British Columbia U-Pb data. Table 4: Nevada-Utah U-Pb data. Table 5: Southern California U-Pb data. Table 6: Sonora U-Pb data. Table 7: Hf standard data. Table 8: Alaska Hf data. Table 9: Northern British Columbia Hf data. Table 10: Southern British Columbia Hf data. Table 11: Nevada-Utah Hf data. Table 12: Southern California Hf data. Table 13: Sonora Hf data.

scholarly journals Supplemental material: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Paleozoic and Triassic passive margin strata of western North America

2020 ◽  
Author(s):  
George Gehrels ◽  
Mark Pecha
Keyword(s):  
North America ◽  
Detrital Zircon ◽  
Analytical Methods ◽  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
File Size ◽  
Supplemental File

Geosphere, February 2014, v. 10, p. 49-65, doi:10.1130/GES00889.1, Supplemental File 1 - Analytical methods file (32 pages, 20 figures). File size is ~6.7 MB.

scholarly journals U–Pb Age and Hf Isotope Geochemistry of Detrital Zircons from Cambrian Sandstones of the Severnaya Zemlya Archipelago and Northern Taimyr (Russian High Arctic)

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 36 ◽  
Author(s):  
Victoria B. Ershova ◽  
Andrei V. Prokopiev ◽  
Andrey K. Khudoley ◽  
Tom Andersen ◽  
Kåre Kullerud ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
High Arctic ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Magmatic Arc ◽  
Novaya Zemlya ◽  
Late Neoproterozoic ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago

U–Pb and Lu–Hf isotope analyses of detrital zircons collected from metasedimentary rocks from the southern part of Kara Terrane (northern Taimyr and Severnaya Zemlya archipelago) provide vital information about the paleogeographic and tectonic evolution of the Russian High Arctic. The detrital zircon signatures of the seven dated samples are very similar, suggesting a common provenance for the clastic detritus. The majority of the dated grains belong to the late Neoproterozoic to Cambrian ages, which suggests the maximum depositional age of the enclosing sedimentary units to be Cambrian. The εHf(t) values indicate that juvenile magma mixed with evolved continental crust and the zircons crystallized within a continental magmatic arc setting. Our data strongly suggest that the main provenance for the studied clastics was located within the Timanian Orogen. A review of the available detrital zircon ages from late Neoproterozoic to Cambrian strata across the wider Arctic strongly suggests that Kara Terrane, Novaya Zemlya, Seward Peninsula (Arctic Alaska), Alexander Terrane, De Long Islands, and Scandinavian Caledonides all formed a single tectonic domain during the Cambrian age, with clastics predominantly sourced from the Timanian Orogen.

Detrital zircon reference for Cambrian to Triassic miogeoclinal strata of western North America

Geology ◽  
1995 ◽  
Vol 23 (9) ◽  
pp. 831 ◽  
Author(s):  
George E. Gehrels ◽  
William R. Dickinson ◽  
Gerald M. Ross ◽  
John H. Stewart ◽  
David G. Howell
Keyword(s):  
North America ◽  
Detrital Zircon ◽  
Western North America

scholarly journals Early Paleozoic post-breakup magmatism along the Cordilleran margin of western North America: New zircon U-Pb age and whole-rock Nd- and Hf-isotope and lithogeochemical results from the Kechika group, Yukon, Canada

Geosphere ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 1262-1290 ◽  
Author(s):  
Roderick W. Campbell ◽  
Luke P. Beranek ◽  
Stephen J. Piercey ◽  
Richard Friedman
Keyword(s):  
North America ◽  
Continental Shelf ◽  
Mantle Source ◽  
Tectonic Setting ◽  
Plate Boundary ◽  
Hf Isotope ◽  
Passive Margin ◽  
Western North America ◽  
South Central ◽  
Cordilleran Margin

AbstractPost-breakup magmatic rocks are recognized features of modern and ancient passive margin successions around the globe, but their timing and significance to non-plume-related rift evolution is generally uncertain. Along the Cordilleran margin of western North America, several competing rift models have been proposed to explain the origins of post-breakup igneous rocks that crop out from Yukon to Nevada. New zircon U-Pb age and whole-rock geochemical studies were conducted on the lower Paleozoic Kechika group, south-central Yukon, to test these rift models and constrain the timing, mantle source, and tectonic setting of post-breakup magmatism in the Canadian Cordillera. The Kechika group contains vent-proximal facies and sediment-sill complexes within the Cassiar platform, a linear paleogeographic high that developed outboard of continental shelf and trough basins. Chemical abrasion (CA-TIMS) U-Pb dates indicate that Kechika group mafic rocks were generated during the late Cambrian (488–483 Ma) and Early Ordovician (473 Ma). Whole-rock trace-element and Nd- and Hf-isotope results are consistent with the low-degree partial melting of an enriched lithospheric mantle source during margin-scale extension. Equivalent continental shelf and trough rocks along western North America are spatially associated with transfer-transform zones and faults that were episodically reactivated during Cordilleran rift evolution. Post-breakup rocks emplaced along the magma-poor North Atlantic margins, including those near the Orphan Knoll and Galicia Bank continental ribbons, are proposed modern analogues for the Kechika group. This scenario calls for the release of in-plane tensile stresses and off-axis, post-breakup magmatism along the nascent plate boundary prior to the onset of seafloor spreading.

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