Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian
Continental margin deposition between the Sturtian- and Marinoan-aged global glacial periods is represented in NW Canada by a siliciclastic-to-carbonate grand cycle. The Keele Formation, a 300–600 m thick carbonate and siliciclastic deposit, comprises the upper part of this interglacial cycle. Sedim...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.555.9640 2023-05-15T16:22:29+02:00 Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian Middle Neoproterozoic Keele Formation Edith S. Day Noel P. James Guy M. Narbonne R. W. Dalrymple The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.9640 http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.9640 http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf Neoproterozoi text 2003 ftciteseerx 2016-01-08T11:46:49Z Continental margin deposition between the Sturtian- and Marinoan-aged global glacial periods is represented in NW Canada by a siliciclastic-to-carbonate grand cycle. The Keele Formation, a 300–600 m thick carbonate and siliciclastic deposit, comprises the upper part of this interglacial cycle. Sedimentary facies in the lower, carbonate-dominated member of the Keele span a broad spectrum of depositional environments, from below storm-wave-base to peritidal to continental, and are disposed across a relatively narrow paleogeographic belt. Lateral arrangement of facies and the gradual stratigraphic transitions between them, suggest deposition in a ramp setting; local slump structures and occasional debrites in deep-water facies imply that the ramp was distally steepened. Fluvial facies are concentrated at a single locality, indicating that terrigenous-clastic sediment was derived from a point source or sources. Most strata of the carbonates are “Bahamian ” in character and similar to Phanerozoic warm-water carbonates in that they contain abundant calcite ooids of interpreted original aragonitic mineralogy and have well-developed muddy peritidal facies. Nevertheless, close juxtaposition of deep- and shallow-water facies in Keele rocks indicates high-amplitude sea-level change during deposition, on the order of ∼100 m, suggesting accumulation in a climatic icehouse period. This interpretation implies that although the globe possessed polar and high-altitude glaciers at this time, sea-surface temperature, at least at tropical latitudes, warmed dramatically between Neoproterozoic glacial episodes. The onset of Marinoan glaciation here is heralded by an abrupt shift to nearshore marine siliciclastic sedimentary rocks. These deposits form Text glacier* Unknown Canada The Ramp ENVELOPE(-38.305,-38.305,-53.990,-53.990) |
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language |
English |
topic |
Neoproterozoi |
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Neoproterozoi Middle Neoproterozoic Keele Formation Edith S. Day Noel P. James Guy M. Narbonne R. W. Dalrymple Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
topic_facet |
Neoproterozoi |
description |
Continental margin deposition between the Sturtian- and Marinoan-aged global glacial periods is represented in NW Canada by a siliciclastic-to-carbonate grand cycle. The Keele Formation, a 300–600 m thick carbonate and siliciclastic deposit, comprises the upper part of this interglacial cycle. Sedimentary facies in the lower, carbonate-dominated member of the Keele span a broad spectrum of depositional environments, from below storm-wave-base to peritidal to continental, and are disposed across a relatively narrow paleogeographic belt. Lateral arrangement of facies and the gradual stratigraphic transitions between them, suggest deposition in a ramp setting; local slump structures and occasional debrites in deep-water facies imply that the ramp was distally steepened. Fluvial facies are concentrated at a single locality, indicating that terrigenous-clastic sediment was derived from a point source or sources. Most strata of the carbonates are “Bahamian ” in character and similar to Phanerozoic warm-water carbonates in that they contain abundant calcite ooids of interpreted original aragonitic mineralogy and have well-developed muddy peritidal facies. Nevertheless, close juxtaposition of deep- and shallow-water facies in Keele rocks indicates high-amplitude sea-level change during deposition, on the order of ∼100 m, suggesting accumulation in a climatic icehouse period. This interpretation implies that although the globe possessed polar and high-altitude glaciers at this time, sea-surface temperature, at least at tropical latitudes, warmed dramatically between Neoproterozoic glacial episodes. The onset of Marinoan glaciation here is heralded by an abrupt shift to nearshore marine siliciclastic sedimentary rocks. These deposits form |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Middle Neoproterozoic Keele Formation Edith S. Day Noel P. James Guy M. Narbonne R. W. Dalrymple |
author_facet |
Middle Neoproterozoic Keele Formation Edith S. Day Noel P. James Guy M. Narbonne R. W. Dalrymple |
author_sort |
Middle Neoproterozoic Keele Formation |
title |
Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
title_short |
Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
title_full |
Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
title_fullStr |
Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
title_full_unstemmed |
Precambrian Research 133 (2004) 223–247 A sedimentary prelude to Marinoan glaciation, Cryogenian |
title_sort |
precambrian research 133 (2004) 223–247 a sedimentary prelude to marinoan glaciation, cryogenian |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.9640 http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf |
long_lat |
ENVELOPE(-38.305,-38.305,-53.990,-53.990) |
geographic |
Canada The Ramp |
geographic_facet |
Canada The Ramp |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.9640 http://geol.queensu.ca/people/narbonne/DayJamesNarbonneDalrymple_PCResearch_2004.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766010456912166912 |