The Southern Alaska Range
Author: Stephen Reid Capps
Publisher:
Published: 1935
Total Pages: 344
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: Stephen Reid Capps
Publisher:
Published: 1935
Total Pages: 344
ISBN-13:
DOWNLOAD EBOOKAuthor: Stephen R. Capps
Publisher:
Published: 1935
Total Pages: 101
ISBN-13:
DOWNLOAD EBOOKAuthor: Bruce L. Reed
Publisher:
Published: 1969
Total Pages: 12
ISBN-13:
DOWNLOAD EBOOKAuthor: Bruce Molnia
Publisher:
Published: 1982
Total Pages: 144
ISBN-13: 9780882401676
DOWNLOAD EBOOKAuthor: Kenneth D. Ridgway
Publisher: Geological Society of America
Published: 2007
Total Pages: 676
ISBN-13: 0813724317
DOWNLOAD EBOOK"The convergent margin of southern Alaska is considered one of the type areas for understanding the growth of continental margins through collisional tectonic processes. Collisional processes that formed this margin were responsible for multiple episodes of sedimentary basin development, subduction complex growth, magmatism, and deformation. Two main collisional episodes shaped this Mesozoic-Cenozoic continental margin. The first event was the Mesozoic collision of the allochthonous Wrangellia composite terrane. This event represents the largest addition of juvenile crust to western North America in the past 100 m.y. The second event is the ongoing collision of the Yakutat terrane along the southeastern margin of Alaska. This Cenozoic event has produced the highest coast mountain range on Earth (Saint Elias Mountains), the Wrangell continental arc, and sedimentary basins throughout southern Alaska. Active collisional processes continue to shape the southern margin of Alaska, mainly through crustal shortening and strike-slip deformation, large-magnitude earthquakes, and rapid uplift and exhumation of mountain belts and high sedimentation rates in adjacent sedimentary basins. This volume contains 24 articles that integrate new geophysical and geologic data, including many field-based studies, to better link the sedimentary, structural, geochemical, and magmatic processes that are important for understanding the development of collisional continental margins."--Publisher's website.
Author:
Publisher:
Published: 1984
Total Pages: 172
ISBN-13:
DOWNLOAD EBOOKAuthor: Jeff Apple Benowitz
Publisher:
Published: 2011
Total Pages: 582
ISBN-13:
DOWNLOAD EBOOKThe topographically segmented, ~700 km long Alaska Range evolved over the last ~50 Ma in response to both far-field driving mechanisms and near-field boundary conditions. The eastern Alaska Range follows the curve of the Denali Fault strike-slip system, forming a large arc of high topography across southern Alaska. The majority of the topography in the eastern Alaska Range lies north of the Fault. A region of low topography separates the eastern Alaska Range from the central Alaska Range, where most of the high topography lies south of the Denali Fault. To the west, there is a restraining bend in the Fault. Southwest of the bend, the north-south trending western Alaska Range takes an abrupt 90 degree turn away from the Denali Fault. I applied 40Ar/39Ar thermochronology to over forty granitic samples to constrain the thermal history of the western and eastern Alaska Range. I combine the 40Ar/39Ar analyses with available apatite fission track and apatite (U-Th)/He dating. I then inferred the Alaska Range's exhumation history from the region's rates and patterns of rock cooling. Periods of mountain building within the Alaska Range are related to Paleocene-Eocene ridge subduction and an associated slab window (~50 Ma to ~35 Ma), Neogene flat-slab subduction of the Yakutat microplate (~24 Ma to present), Yakutat microplate latitudinal variation in thickness (~6 Ma to present), block rotation/migration, and fault reorganization along the Denali Fault. However, it is clear from basin, petrological and thermochronological constraints that not all of the far-field driving mechanisms affected every segment of the Alaska Range to the same degree or at the same time. Alaska Range tectonic reconstruction is also complicated by near-field structural controls on both the timing and extent of deformation. Fault geometry affects both the amount of exhumation (e.g., ~14 km in the Susitna Glacier region of the eastern Alaska Range) and location of topographic development (e.g., north or south of the Denali Fault). The topographic signature we see today is also in part the result of a pre-existing landscape modified by Plio-Quaternary (~3 Ma to present) surface processes.
Author: Edward Huntington Cobb
Publisher:
Published: 1979
Total Pages: 424
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 2016
Total Pages: 0
ISBN-13: 9781594859663
DOWNLOAD EBOOKBattreall's imagery and personal experiences anchor Alaska Range, while a collection of essays, by beloved Alaskan writers and adventurers Art Davidson, Roman Dial, Jeff Benowitz, Verna Pratt, Bill Sherwonit, Brian Okonek, and Clint Helander--provide rich context, examining the range's geology, recounting its exploration and mountaineering histories, and delving into an intimate look at the flora and fauna..
Author: John M. Kauffmann
Publisher: The Mountaineers Books
Published: 1992
Total Pages: 196
ISBN-13: 9780898863475
DOWNLOAD EBOOKA richly drawn, in-depth profile of one of the world's last unspoiled wildernesses.