Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments
ABSTRACT Two Pleistocene channel fills located in two different geological settings, on Guadeloupe in the lesser Antilles and along the Coppermine River in the Northwest Territories of Canada, have different clast compositions, scale, and origin of fragmentation but have similar depositional charact...
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Language: | English |
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Wiley
1985
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Online Access: | http://dx.doi.org/10.1111/j.1365-3091.1985.tb00492.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1985.tb00492.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1985.tb00492.x |
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crwiley:10.1111/j.1365-3091.1985.tb00492.x 2024-06-02T08:05:30+00:00 Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments LAJOIE, JEAN ST‐ONGE, DENIS A. 1985 http://dx.doi.org/10.1111/j.1365-3091.1985.tb00492.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1985.tb00492.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1985.tb00492.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 32, issue 1, page 59-67 ISSN 0037-0746 1365-3091 journal-article 1985 crwiley https://doi.org/10.1111/j.1365-3091.1985.tb00492.x 2024-05-03T11:09:19Z ABSTRACT Two Pleistocene channel fills located in two different geological settings, on Guadeloupe in the lesser Antilles and along the Coppermine River in the Northwest Territories of Canada, have different clast compositions, scale, and origin of fragmentation but have similar depositional characteristics. Massive bedding or absence of structures caused by traction, sharp non‐erosive contacts, reverse coarse‐tail grading, matrix‐supported clasts together indicate a debris‐flow mechanism in which mixtures of fine and coarse sediments moved downslope by laminar flow. Field evidence suggests subaqueous deposition for both deposits. Both bed thickness (BTh)/maximum grain size (MGS) ratios and correlations appear characteristic of subaqueous masses capable of flowing on slopes less than 1°. The two channel fills have random BTh and MGS variations, they do not thin and fine up‐section. It is suggested that fills originating from laminar mass transport could normally have random BTh and MGS up‐section variations. In flysch and volcaniclastic sequences, where coarse sediments interpreted as laminar flow deposits are common, up‐section BTh and MGS variations may result from processes related to source, slope, and flow characteristics rather than from the environment in which the sediments accumulate (channel). Article in Journal/Newspaper Coppermine River Northwest Territories Wiley Online Library Canada Northwest Territories Sedimentology 32 1 59 67 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Two Pleistocene channel fills located in two different geological settings, on Guadeloupe in the lesser Antilles and along the Coppermine River in the Northwest Territories of Canada, have different clast compositions, scale, and origin of fragmentation but have similar depositional characteristics. Massive bedding or absence of structures caused by traction, sharp non‐erosive contacts, reverse coarse‐tail grading, matrix‐supported clasts together indicate a debris‐flow mechanism in which mixtures of fine and coarse sediments moved downslope by laminar flow. Field evidence suggests subaqueous deposition for both deposits. Both bed thickness (BTh)/maximum grain size (MGS) ratios and correlations appear characteristic of subaqueous masses capable of flowing on slopes less than 1°. The two channel fills have random BTh and MGS variations, they do not thin and fine up‐section. It is suggested that fills originating from laminar mass transport could normally have random BTh and MGS up‐section variations. In flysch and volcaniclastic sequences, where coarse sediments interpreted as laminar flow deposits are common, up‐section BTh and MGS variations may result from processes related to source, slope, and flow characteristics rather than from the environment in which the sediments accumulate (channel). |
format |
Article in Journal/Newspaper |
author |
LAJOIE, JEAN ST‐ONGE, DENIS A. |
spellingShingle |
LAJOIE, JEAN ST‐ONGE, DENIS A. Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
author_facet |
LAJOIE, JEAN ST‐ONGE, DENIS A. |
author_sort |
LAJOIE, JEAN |
title |
Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
title_short |
Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
title_full |
Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
title_fullStr |
Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
title_full_unstemmed |
Characteristics of two Pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
title_sort |
characteristics of two pleistocene channel‐fill deposits and their implication on the interpretation of megasequences in ancient sediments |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1985.tb00492.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1985.tb00492.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1985.tb00492.x |
geographic |
Canada Northwest Territories |
geographic_facet |
Canada Northwest Territories |
genre |
Coppermine River Northwest Territories |
genre_facet |
Coppermine River Northwest Territories |
op_source |
Sedimentology volume 32, issue 1, page 59-67 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.1985.tb00492.x |
container_title |
Sedimentology |
container_volume |
32 |
container_issue |
1 |
container_start_page |
59 |
op_container_end_page |
67 |
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1800750307846651904 |