There is more Wrangellia — magnetic characterization of southern Alaska crust
In southern Alaska, Wrangellia-type magnetic crustal character extends from the Talkeetna Mountains southwest through the Alaska Range to the Bristol Bay region. Magnetic data analyses in the Talkeetna Mountains showed that there are mid-crustal differences in the magnetic properties of Wrangellia a...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/cjes-2020-0209 2023-12-17T10:17:51+01:00 There is more Wrangellia — magnetic characterization of southern Alaska crust Saltus, Richard W. Hudson, Travis L. 2022 http://dx.doi.org/10.1139/cjes-2020-0209 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2020-0209 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2020-0209 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 59, issue 4, page 243-257 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2022 crcansciencepubl https://doi.org/10.1139/cjes-2020-0209 2023-11-19T13:38:19Z In southern Alaska, Wrangellia-type magnetic crustal character extends from the Talkeetna Mountains southwest through the Alaska Range to the Bristol Bay region. Magnetic data analyses in the Talkeetna Mountains showed that there are mid-crustal differences in the magnetic properties of Wrangellia and the Peninsular terrane. After converting total field magnetic anomaly data to magnetic potential, we applied Fourier filtering techniques to remove magnetic responses from deep and shallow sources. The resulting mid-crustal magnetic characterization delineates the regional magnetic potential domains that correspond to the Wrangellia and Peninsular terranes throughout southern Alaska. These magnetic potential domains show that Wrangellia-type crust extends southwest to the Iliamna Lake region and that it overlaps the mapped Peninsular terrane. Upon reconsidering geologic ties between Wrangellia, Peninsular, and Alexander terranes, we conclude that Peninsular terrane is part of what we here call Western Wrangellia. Western Wrangellia contains the Lower Jurassic Talkeetna volcanic arc and is similar to Wrangellia of the Vancouver Island area, Canada (Southern Wrangellia), which contains the Lower Jurassic Bonanza volcanic arc. Others have previously made this correlation and proposed that the Talkeetna arc-bearing part of southern Alaska was displaced from the Bonanza arc-bearing part of Canada. We generally agree and propose that about 1000 km of dextral displacement along ancestral Border Ranges fault segments and other faults of south-central Alaska separated Western Wrangellia from Southern Wrangellia. We think this displacement was mostly in the Late Jurassic and earliest Cretaceous, perhaps between about 160 and 130 Ma. Article in Journal/Newspaper alaska range Alaska Canadian Science Publishing (via Crossref) Canada Bonanza ENVELOPE(-119.820,-119.820,55.917,55.917) Canadian Journal of Earth Sciences |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Saltus, Richard W. Hudson, Travis L. There is more Wrangellia — magnetic characterization of southern Alaska crust |
topic_facet |
General Earth and Planetary Sciences |
description |
In southern Alaska, Wrangellia-type magnetic crustal character extends from the Talkeetna Mountains southwest through the Alaska Range to the Bristol Bay region. Magnetic data analyses in the Talkeetna Mountains showed that there are mid-crustal differences in the magnetic properties of Wrangellia and the Peninsular terrane. After converting total field magnetic anomaly data to magnetic potential, we applied Fourier filtering techniques to remove magnetic responses from deep and shallow sources. The resulting mid-crustal magnetic characterization delineates the regional magnetic potential domains that correspond to the Wrangellia and Peninsular terranes throughout southern Alaska. These magnetic potential domains show that Wrangellia-type crust extends southwest to the Iliamna Lake region and that it overlaps the mapped Peninsular terrane. Upon reconsidering geologic ties between Wrangellia, Peninsular, and Alexander terranes, we conclude that Peninsular terrane is part of what we here call Western Wrangellia. Western Wrangellia contains the Lower Jurassic Talkeetna volcanic arc and is similar to Wrangellia of the Vancouver Island area, Canada (Southern Wrangellia), which contains the Lower Jurassic Bonanza volcanic arc. Others have previously made this correlation and proposed that the Talkeetna arc-bearing part of southern Alaska was displaced from the Bonanza arc-bearing part of Canada. We generally agree and propose that about 1000 km of dextral displacement along ancestral Border Ranges fault segments and other faults of south-central Alaska separated Western Wrangellia from Southern Wrangellia. We think this displacement was mostly in the Late Jurassic and earliest Cretaceous, perhaps between about 160 and 130 Ma. |
format |
Article in Journal/Newspaper |
author |
Saltus, Richard W. Hudson, Travis L. |
author_facet |
Saltus, Richard W. Hudson, Travis L. |
author_sort |
Saltus, Richard W. |
title |
There is more Wrangellia — magnetic characterization of southern Alaska crust |
title_short |
There is more Wrangellia — magnetic characterization of southern Alaska crust |
title_full |
There is more Wrangellia — magnetic characterization of southern Alaska crust |
title_fullStr |
There is more Wrangellia — magnetic characterization of southern Alaska crust |
title_full_unstemmed |
There is more Wrangellia — magnetic characterization of southern Alaska crust |
title_sort |
there is more wrangellia — magnetic characterization of southern alaska crust |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cjes-2020-0209 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2020-0209 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2020-0209 |
long_lat |
ENVELOPE(-119.820,-119.820,55.917,55.917) |
geographic |
Canada Bonanza |
geographic_facet |
Canada Bonanza |
genre |
alaska range Alaska |
genre_facet |
alaska range Alaska |
op_source |
Canadian Journal of Earth Sciences volume 59, issue 4, page 243-257 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2020-0209 |
container_title |
Canadian Journal of Earth Sciences |
_version_ |
1785523427495378944 |