Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada
Eustasy, tectonics, and climate contributed to a remarkable MiocenePliocene regional unconformity in the BeaufortMackenzie area of Arctic Canada. The unconformity extends from beneath deep basin turbidites on the continental rise, upslope across an erosional paleocontinental shelf, onto the craton...
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crcansciencepubl:10.1139/e00-098 2024-04-28T08:08:41+00:00 Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada McNeil, D H Duk-Rodkin, A Dixon, J Dietrich, J R White, J M Miller, K G Issler, D R 2001 http://dx.doi.org/10.1139/e00-098 http://www.nrcresearchpress.com/doi/pdf/10.1139/e00-098 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 38, issue 2, page 309-331 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2001 crcansciencepubl https://doi.org/10.1139/e00-098 2024-04-09T06:56:31Z Eustasy, tectonics, and climate contributed to a remarkable MiocenePliocene regional unconformity in the BeaufortMackenzie area of Arctic Canada. The unconformity extends from beneath deep basin turbidites on the continental rise, upslope across an erosional paleocontinental shelf, onto the cratonic margin as a regional paleosurface (peneplain) in the Mackenzie Delta area, and into pediment surfaces cut into the orogenic highlands of the Richardson Mountains. The unconformity was initiated by shelf exposure during latest Messinian or earliest Pliocene eustatic lowstand and was accentuated by tectonic uplift from the culmination of a major Late Miocene compressional pulse on the basin margin. Palynomorph, benthic foraminiferal, strontium isotopic, paleomagnetic, and radiometric data document the climatic and chronological events surrounding the unconformity. A widespread hardground (K-59 limestone) occurs at the unconformity and caps the Late Miocene Akpak Sequence. The hardground yields the benthic foraminifera Cibicides grossus, a regional marker in the Arctic Pliocene, and the bryozoan Adeonella sp. aff. A. polystomella, previously known from temperate North Atlantic environments. The 87 Sr/ 86 Sr data and new biostrati gra phic data indicate that the C. grossus Zone in the BeaufortMackenzie area may be younger than previously estimated, ranging into the earliest Pleistocene. Late Miocene regional uplift across the cratonic margin, coupled with eustatic lowstand followed by Early Pliocene tectonic quiescence and dry cool climatic conditions, combined to produce widespread erosion (pediments and peneplanation). Rapid erosion contributed to the >4 km-thick, PliocenePleistocene Iperk Sequence and a 23-fold increase in sedimentation rates relative to the Early and Middle Miocene. Article in Journal/Newspaper Arctic Foraminifera* Mackenzie Delta North Atlantic Canadian Science Publishing Canadian Journal of Earth Sciences 38 2 309 331 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences McNeil, D H Duk-Rodkin, A Dixon, J Dietrich, J R White, J M Miller, K G Issler, D R Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Eustasy, tectonics, and climate contributed to a remarkable MiocenePliocene regional unconformity in the BeaufortMackenzie area of Arctic Canada. The unconformity extends from beneath deep basin turbidites on the continental rise, upslope across an erosional paleocontinental shelf, onto the cratonic margin as a regional paleosurface (peneplain) in the Mackenzie Delta area, and into pediment surfaces cut into the orogenic highlands of the Richardson Mountains. The unconformity was initiated by shelf exposure during latest Messinian or earliest Pliocene eustatic lowstand and was accentuated by tectonic uplift from the culmination of a major Late Miocene compressional pulse on the basin margin. Palynomorph, benthic foraminiferal, strontium isotopic, paleomagnetic, and radiometric data document the climatic and chronological events surrounding the unconformity. A widespread hardground (K-59 limestone) occurs at the unconformity and caps the Late Miocene Akpak Sequence. The hardground yields the benthic foraminifera Cibicides grossus, a regional marker in the Arctic Pliocene, and the bryozoan Adeonella sp. aff. A. polystomella, previously known from temperate North Atlantic environments. The 87 Sr/ 86 Sr data and new biostrati gra phic data indicate that the C. grossus Zone in the BeaufortMackenzie area may be younger than previously estimated, ranging into the earliest Pleistocene. Late Miocene regional uplift across the cratonic margin, coupled with eustatic lowstand followed by Early Pliocene tectonic quiescence and dry cool climatic conditions, combined to produce widespread erosion (pediments and peneplanation). Rapid erosion contributed to the >4 km-thick, PliocenePleistocene Iperk Sequence and a 23-fold increase in sedimentation rates relative to the Early and Middle Miocene. |
format |
Article in Journal/Newspaper |
author |
McNeil, D H Duk-Rodkin, A Dixon, J Dietrich, J R White, J M Miller, K G Issler, D R |
author_facet |
McNeil, D H Duk-Rodkin, A Dixon, J Dietrich, J R White, J M Miller, K G Issler, D R |
author_sort |
McNeil, D H |
title |
Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
title_short |
Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
title_full |
Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
title_fullStr |
Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
title_full_unstemmed |
Sequence stratigraphy, biotic change, 87 Sr/ 86 Sr record, paleoclimatic history, and sedimentation rate change across a regional late Cenozoic unconformity in Arctic Canada |
title_sort |
sequence stratigraphy, biotic change, 87 sr/ 86 sr record, paleoclimatic history, and sedimentation rate change across a regional late cenozoic unconformity in arctic canada |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/e00-098 http://www.nrcresearchpress.com/doi/pdf/10.1139/e00-098 |
genre |
Arctic Foraminifera* Mackenzie Delta North Atlantic |
genre_facet |
Arctic Foraminifera* Mackenzie Delta North Atlantic |
op_source |
Canadian Journal of Earth Sciences volume 38, issue 2, page 309-331 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e00-098 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
38 |
container_issue |
2 |
container_start_page |
309 |
op_container_end_page |
331 |
_version_ |
1797577359261433856 |