Boulder, CO, USA - The tectonic evolution of the Arctic remains a subject of considerable uncertainty. The unknown Paleozoic and Mesozoic movements of a large block of continental crust, the Arctic Alaska-Chukotka microplate, contribute significantly to that uncertainty. Edited by Julie A. Dumoulin and Allison Till of the U.S. Geological Survey, this eight-chapter volume addresses that uncertainty and demonstrates the power of modern research tools to penetrate the effects of orogenesis and to reconstruct pre-deformational tectonic and paleogeographic histories.
The integrated geologic, geochronologic, geochemical, isotopic, and paleontologic results presented in this well-illustrated volume were obtained from a penetratively deformed and metamorphosed blueschist terrane. Dumoulin and Till remark that the work presented here is fundamental to understanding the origin, character, and movements of the Artic Alaska-Chukotka microplate from the Late Proterozoic to the Devonian. It also includes the first compelling evidence for a rift event that may have detached the microplate from the Timanide margin of Baltica.
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Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits
Julie A. Dumoulin and Alison B. Till (editors)
Geological Society of America Special Paper 506
SPE506, 258 p., $80.00; Member price $56.00
View the table of contents: http://rock.geosociety.org/store/TOC/spe506.pdf