The Arctic Ocean
Alan Nairn, Francis Greenough Stehli
Springer US, 1981 - Science - 672 pages
This trip backward in time capsulizes in a general way the geologic development of the area that is now northern Alaska. The Cretaceous through Recent history is predominantly one of erosion of the ancient Brooks Range and filling of the Colville Geosyncline under processes like those in Operation today. All the rocks older than Jurassic, however, were deposited far from their present sites. One of the intriguing tectonic puzzles involves the geographic positions and relative timing of events that occurred during the orogeny that built the Brooks Range. I suggest that pre-Cretaceous deposition took place far to the north along the western margin of the Caledonides. Subsequently, the region that is now northern Alaska moved southward and impinged upon a northward moving plate, or plates, from the Pacific region. Interactions between these two major parts of the earth's crust produced the Brooks Range during the Jurassic. Later developments reflect continuing readjustments of the northern third of of thrust Alaska as southward movement was dissipated in diverse systems faulting and lateral displacement. ACKNOWLEDGMENTS I am indebted to many colleagues who, during the past 30 years, shared with me the excitement and pleasures of exploring the geology of northern Alaska. Among these are W. P. Brosge, H. N. Reiser, R. L. Detterman, A. K. Armstrong, A. L. Bowsher, E. G. Sable, I. L. Tailleur, C. G. Mull, M. D. Mangus, A. H. Lachenbruch, M. C. Lachenbruch, R. L. Morris, C. J.
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Continental Plates and Accreted Oceanic
Relations between Terranes
Review of Paleomagnetic Data
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Alaska anomaly Arch Arctic Archipelago Arctic Ocean Arctic Platform Baffin Bay basalt basement Beaufort Shelf belt Birkenmajer Boothia Uplift Brooks Range Caledonian Cambrian Canada Basin Canadian Arctic Islands carbonate Carboniferous Chukchi clastic complex conglomerate continental margin continental shelf Cordillera Cretaceous crustal crystalline Dawes deposits Devonian dolomite early East Greenland eastern Eldholm Ellesmere Island Ellesmerian Orogeny Eurekan Deformation faults folds Formation Franklinian Geosyncline Geol Geology geosyncline GNSA Greenland Foldbelt Groenl Harland Iceland Jurassic Kerr Labrador Sea limestone Lower Paleozoic magnetic Mesozoic metamorphic North Greenland northern northwest occur Ocean Basin Ordovician Orogeny Paleozoic Peary Land Pearya Geanticline Peninsula Permian Petrol Phase plate Precambrian Proterozoic quartzite region Ridge Rifting Episode rocks sandstone sedimentary sediments seismic Sequence shale siltstone Silurian southeast Spitsbergen strata stratigraphic strike-slip structural Surv Svalbard Sverdrup Basin Talwani tectonic terranes Tertiary thick Thorsteinsson trends Trettin Triassic Trough unconformity Upper Vogt volcanic western zone