Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska
Sediments deposited in three fjord systems latitudinally spanning the northeast Gulf of Alaska coastline have distinctive rock magnetic characteristics that are derived from glacially eroded accreted terranes. Ideal conditions exist in coastal Alaska to preserve primary rock magnetic properties with...
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Online Access: | http://dx.doi.org/10.1139/e06-042 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-042 |
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crcansciencepubl:10.1139/e06-042 2023-12-17T10:30:28+01:00 Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska Cowan, Ellen A Brachfeld, Stefanie A Powell, Ross D Schoolfield, Stephanie C 2006 http://dx.doi.org/10.1139/e06-042 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-042 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 43, issue 9, page 1269-1282 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2006 crcansciencepubl https://doi.org/10.1139/e06-042 2023-11-19T13:38:28Z Sediments deposited in three fjord systems latitudinally spanning the northeast Gulf of Alaska coastline have distinctive rock magnetic characteristics that are derived from glacially eroded accreted terranes. Ideal conditions exist in coastal Alaska to preserve primary rock magnetic properties within the sediment record because of the dominance of glacial erosion and rapid sediment transportation and burial. In temperate glacially dominated marine settings, terrigenous sediment is not diluted by biogenic material and diagenetic alteration is minimal. The juxtaposition of temperate glaciers on the northwest-trending accreted terranes of the southern Alaska continental margin provides magnetic provenance tracers of sediment derived from this region that can aid in the interpretation of glacial, paleoclimate, and tectonic proxy records from marine sediment. Holocene sediment deposited in Glacier Bay is eroded from the Craig subterrane of the Alexander terrane; it is characterized by high-volume magnetic susceptibility and coarse-grained, pseudosingle-domain (PSD) and multidomain (MD) magnetite. In Yakutat and Disenchantment bays, farther to the north, glaciers also erode the Yakutat and Chugach terranes. There, sediment contains slightly finer-grained PSD and MD magnetite, which is chemically distinct from that of Glacier Bay. In the northern-most sector, sediment is eroded from the Chugach terrrane in Harriman and College fiords, adjacent to Prince William Sound. These sediments have low magnetic susceptibility and contain micron-size pyrrhotite. Article in Journal/Newspaper glacier glaciers Yakutat Alaska Canadian Science Publishing (via Crossref) Gulf of Alaska Glacier Bay Canadian Journal of Earth Sciences 43 9 1269 1282 |
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 Cowan, Ellen A Brachfeld, Stefanie A Powell, Ross D Schoolfield, Stephanie C Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
topic_facet |
General Earth and Planetary Sciences |
description |
Sediments deposited in three fjord systems latitudinally spanning the northeast Gulf of Alaska coastline have distinctive rock magnetic characteristics that are derived from glacially eroded accreted terranes. Ideal conditions exist in coastal Alaska to preserve primary rock magnetic properties within the sediment record because of the dominance of glacial erosion and rapid sediment transportation and burial. In temperate glacially dominated marine settings, terrigenous sediment is not diluted by biogenic material and diagenetic alteration is minimal. The juxtaposition of temperate glaciers on the northwest-trending accreted terranes of the southern Alaska continental margin provides magnetic provenance tracers of sediment derived from this region that can aid in the interpretation of glacial, paleoclimate, and tectonic proxy records from marine sediment. Holocene sediment deposited in Glacier Bay is eroded from the Craig subterrane of the Alexander terrane; it is characterized by high-volume magnetic susceptibility and coarse-grained, pseudosingle-domain (PSD) and multidomain (MD) magnetite. In Yakutat and Disenchantment bays, farther to the north, glaciers also erode the Yakutat and Chugach terranes. There, sediment contains slightly finer-grained PSD and MD magnetite, which is chemically distinct from that of Glacier Bay. In the northern-most sector, sediment is eroded from the Chugach terrrane in Harriman and College fiords, adjacent to Prince William Sound. These sediments have low magnetic susceptibility and contain micron-size pyrrhotite. |
format |
Article in Journal/Newspaper |
author |
Cowan, Ellen A Brachfeld, Stefanie A Powell, Ross D Schoolfield, Stephanie C |
author_facet |
Cowan, Ellen A Brachfeld, Stefanie A Powell, Ross D Schoolfield, Stephanie C |
author_sort |
Cowan, Ellen A |
title |
Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
title_short |
Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
title_full |
Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
title_fullStr |
Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
title_full_unstemmed |
Terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal Alaska |
title_sort |
terrane-specific rock magnetic characteristics preserved in glacimarine sediment from southern coastal alaska |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/e06-042 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-042 |
geographic |
Gulf of Alaska Glacier Bay |
geographic_facet |
Gulf of Alaska Glacier Bay |
genre |
glacier glaciers Yakutat Alaska |
genre_facet |
glacier glaciers Yakutat Alaska |
op_source |
Canadian Journal of Earth Sciences volume 43, issue 9, page 1269-1282 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e06-042 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
43 |
container_issue |
9 |
container_start_page |
1269 |
op_container_end_page |
1282 |
_version_ |
1785583437113982976 |