Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska

The Klakas orogeny is a Late Silurian-Early Devonian deformational, metamorphic, and mountain-building event that marks a major change in the geologic history of the southern Alexander terrane. During Ordovician-Silurian time this region was a marine volcano-plutonic province in which volcani-clasti...

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Main Authors: Gehrels, George E., Saleeby, Jason B., Berg, Henry C.
Other Authors: Stevens, Calvin H.
Format: Book Part
Language:unknown
Published: Society of Economic Paleontologists and Mineralogists 1983
Subjects:
Online Access:https://authors.library.caltech.edu/53895/
https://authors.library.caltech.edu/53895/1/Saleeby_1983p131.pdf
https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302
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spelling ftcaltechauth:oai:authors.library.caltech.edu:53895 2023-05-15T18:03:31+02:00 Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska Gehrels, George E. Saleeby, Jason B. Berg, Henry C. Stevens, Calvin H. 1983 application/pdf https://authors.library.caltech.edu/53895/ https://authors.library.caltech.edu/53895/1/Saleeby_1983p131.pdf https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302 unknown Society of Economic Paleontologists and Mineralogists https://authors.library.caltech.edu/53895/1/Saleeby_1983p131.pdf Gehrels, George E. and Saleeby, Jason B. and Berg, Henry C. (1983) Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska. In: Pre-Jurassic rocks in western North American suspect terranes. Society of Economic Paleontologists and Mineralogists , Los Angeles, CA, pp. 131-141. https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302 <https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302> Book Section PeerReviewed 1983 ftcaltechauth 2020-04-26T16:52:36Z The Klakas orogeny is a Late Silurian-Early Devonian deformational, metamorphic, and mountain-building event that marks a major change in the geologic history of the southern Alexander terrane. During Ordovician-Silurian time this region was a marine volcano-plutonic province in which volcani-clastic strata and shallow-water limestones were deposited adjacent to andesitic and dacitic volcanic centers. After the Klakas orogeny, shallow-marine sedimentation prevailed with only local volcanism. Manifestations of this orogenic event included: 1) shallow-level brecciation of Ordovician-Silurian rocks on southern Prince of Wales Island, 2) deformation along with greenschist- and perhaps amphibolite-facies metamorphism of Ordovician-Silurian rocks on Annette and Gravina Islands, 3) structural uplift of at least several kilometers during or shortly after the deformation, 4) uplift of mountainous areas with kilometer-scale topographic relief, and 5) deposition of a subaerial to shallow-marine elastic wedge that was shed from these uplifted areas. Reconstructions of the paleogeography and tectonic history of the Alexander terrane during Ordovician through Devonian time reveal that: 1) the eastern (Annette) and western (Craig) subterranes of the Alexander terrane are part of the same tectonic fragment, 2) the deformational fabrics in Paleozoic rocks in the southern part of the terrane are primarily Late Silurian-Early Devonian in age, and not a product of the Late Cretaceous accretion of the terrane, and 3) northeastern Chichagof Island may have been adjacent to southern Prince of Wales Island during Silurian-Devonian time, which suggests that the Chatham Strait fault and related fault systems may have approximately 350 km of post-Devonian right-slip displacement. Book Part Prince of Wales Island Alaska Caltech Authors (California Institute of Technology) Prince of Wales Island ENVELOPE(-99.001,-99.001,72.668,72.668)
institution Open Polar
collection Caltech Authors (California Institute of Technology)
op_collection_id ftcaltechauth
language unknown
description The Klakas orogeny is a Late Silurian-Early Devonian deformational, metamorphic, and mountain-building event that marks a major change in the geologic history of the southern Alexander terrane. During Ordovician-Silurian time this region was a marine volcano-plutonic province in which volcani-clastic strata and shallow-water limestones were deposited adjacent to andesitic and dacitic volcanic centers. After the Klakas orogeny, shallow-marine sedimentation prevailed with only local volcanism. Manifestations of this orogenic event included: 1) shallow-level brecciation of Ordovician-Silurian rocks on southern Prince of Wales Island, 2) deformation along with greenschist- and perhaps amphibolite-facies metamorphism of Ordovician-Silurian rocks on Annette and Gravina Islands, 3) structural uplift of at least several kilometers during or shortly after the deformation, 4) uplift of mountainous areas with kilometer-scale topographic relief, and 5) deposition of a subaerial to shallow-marine elastic wedge that was shed from these uplifted areas. Reconstructions of the paleogeography and tectonic history of the Alexander terrane during Ordovician through Devonian time reveal that: 1) the eastern (Annette) and western (Craig) subterranes of the Alexander terrane are part of the same tectonic fragment, 2) the deformational fabrics in Paleozoic rocks in the southern part of the terrane are primarily Late Silurian-Early Devonian in age, and not a product of the Late Cretaceous accretion of the terrane, and 3) northeastern Chichagof Island may have been adjacent to southern Prince of Wales Island during Silurian-Devonian time, which suggests that the Chatham Strait fault and related fault systems may have approximately 350 km of post-Devonian right-slip displacement.
author2 Stevens, Calvin H.
format Book Part
author Gehrels, George E.
Saleeby, Jason B.
Berg, Henry C.
spellingShingle Gehrels, George E.
Saleeby, Jason B.
Berg, Henry C.
Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
author_facet Gehrels, George E.
Saleeby, Jason B.
Berg, Henry C.
author_sort Gehrels, George E.
title Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
title_short Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
title_full Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
title_fullStr Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
title_full_unstemmed Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska
title_sort preliminary description of the late silurian-early devonian klakas orogeny in the southern alexander terrane, southeastern alaska
publisher Society of Economic Paleontologists and Mineralogists
publishDate 1983
url https://authors.library.caltech.edu/53895/
https://authors.library.caltech.edu/53895/1/Saleeby_1983p131.pdf
https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302
long_lat ENVELOPE(-99.001,-99.001,72.668,72.668)
geographic Prince of Wales Island
geographic_facet Prince of Wales Island
genre Prince of Wales Island
Alaska
genre_facet Prince of Wales Island
Alaska
op_relation https://authors.library.caltech.edu/53895/1/Saleeby_1983p131.pdf
Gehrels, George E. and Saleeby, Jason B. and Berg, Henry C. (1983) Preliminary description of the Late Silurian-Early Devonian Klakas Orogeny in the southern Alexander terrane, southeastern Alaska. In: Pre-Jurassic rocks in western North American suspect terranes. Society of Economic Paleontologists and Mineralogists , Los Angeles, CA, pp. 131-141. https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302 <https://resolver.caltech.edu/CaltechAUTHORS:20150120-140541302>
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