10Be ages of late Pleistocene deglaciation and Neoglaciation in the north-central Brooks Range, Arctic Alaska

2012 ◽  
Vol 28 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Michael E. Badding ◽  
Jason P. Briner ◽  
Darrell S. Kaufman
Keyword(s):  
Late Pleistocene ◽  
Brooks Range ◽  
North Central ◽  
The North ◽  
Arctic Alaska

Kinematic and subsidence modeling of the north-central Brooks Range and North Slope of Alaska

1995 ◽  
Author(s):  
Frances E. Cole ◽  
K.J. Bird ◽  
Jaime Toro ◽  
Francois Roure ◽  
D.G. Howell
Keyword(s):  
North Slope ◽  
Brooks Range ◽  
North Central ◽  
The North ◽  
North Slope Of Alaska

scholarly journals Permian deposition in the north central Brooks Range, Alaska: Constraints for tectonic reconstructions

1997 ◽  
Vol 102 (B9) ◽  
pp. 20727-20748 ◽  
Author(s):  
Karen E. Adams ◽  
Charles G. Mull ◽  
R. Keith Crowder
Keyword(s):  
Brooks Range ◽  
North Central ◽  
The North ◽  
Tectonic Reconstructions

U-Pb and oxygen isotope characteristics of Timanian- and Caledonian-age detrital zircons from the Brooks Range, Arctic Alaska, USA

2019 ◽  
Vol 131 (9-10) ◽  
pp. 1459-1479
Author(s):  
F.A. Robinson ◽  
J. Toro ◽  
V. Pease
Keyword(s):  
Detrital Zircon ◽  
Crustal Contamination ◽  
Progressive Increase ◽  
Detrital Zircons ◽  
Rich Region ◽  
Brooks Range ◽  
The North ◽  
Arctic Alaska ◽  
Formed Part ◽  
Amerasian Basin

AbstractThe Devonian connection between the Brooks Range of Alaska, USA, with the continental margin of Arctic Canada and its subsequent Jurassic–Cretaceous counterclockwise rotation to form the Amerasian Basin, is a highly debated topic in Arctic tectonics. This resource-rich region was assembled from terranes that formed part of Laurentia or Baltica, or were juvenile oceanic arcs in the early Paleozoic that were brought together during Caledonian Orogenesis and the subsequent collision that formed Pangea (Uralide Orogeny). Elements of these orogens, as well as older ones, are predicted to occur in the Brooks Range of Arctic Alaska. This study presents the first combined zircon U-Pb and oxygen data from six Brooks Range metasedimentary units with assumed Neoproterozoic to Devonian ages. Three distinct detrital zircon patterns are identified in these units: (1) those with Neoproterozoic maximum depositional ages characteristic of the Timanide Orogen of northern Baltica and adjacent parts of Siberia, (2) an almost unimodal Siluro–Ordovician (443.5 ± 2.3 Ma) detrital zircon population consistent with the oceanic Apoon arc believed to have existed off shore of northern Laurentia and to have accreted to the North Slope subterrane during the Caledonian event, and (3) those with Middle Devonian maximum depositional ages consistent with post-accretion extension during the final (Scandian) phase of Caledonian Orogenesis. Oxygen isotopes from the same zircons reveal minor to significant crustal contamination with approximately two thirds (n = 255/405) having δ18O values >5.9‰ (above the mantle field of 5.3 ± 0.6‰). Pattern 1 units exhibit a progressive increase in δ18O values throughout the Proterozoic (5.99 to 9.29‰) indicative of increasing crustal growth and Timanide age zircons yield average δ18O values of 7.18 ± 0.64‰ (n = 26) suggestive of more crustal influence than Caledonian age zircons, possibly reflecting northern Baltica signatures. The unimodal population in Pattern 2 yields average δ18O values of 5.49 ± 0.66‰ (n = 17) and 6.02 ± 0.27‰ (n = 23) prior to and during, respectively, the main Caledonian event and suggest derivation from Devonian juvenile arc sources possibly representing the initiation of the collision between Laurentia and Baltica. Similar to Pattern 1, the δ18O values associated with Pattern 3 show a progressive increase in δ18O values throughout the Proterozoic (5.00 to 9.39‰). However, Pattern 3 also exhibits a distinct juvenile fingerprint (6.13 ± 0.24‰, n = 51) during the main Caledonian event and a slight increase to 7.12 ± 1‰ (n = 7) in post-Caledonian zircons possibly suggest correlating with a post-accretion phase in which proximally sourced zircon-bearing detritus was deposited in extension-related basins marking the joining of Laurentia and Baltica.

Dấu hiệu các bờ biển cổ ở đáy biển nông ven bờ Bắc Trung Bộ vỡ tiềm năng sa khoáng liên quan

2008 ◽  
Vol 30 (4) ◽  
pp. 323-335
Author(s):  
La Thế Phúc ◽  
Vũ Trường Sơn
Keyword(s):  
Late Pleistocene ◽  
North Central ◽  
The North

Traces of the buried Late Pleistocene ancient coastline in the coastal shallow bed of the North Central part of Vietnam and associated placer potential

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