Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada
The Late Coniacian, shallow‐marine Bad Heart Formation of the Western Canada foreland basin is very unusual in that it contains economically significant ooidal ironstone. Deposition of shallow‐water and iron‐rich facies appears to have been localized over the crest and flanks of a subtle intrabasina...
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crwiley:10.1046/j.1365-3091.1999.00271.x 2024-06-23T07:56:01+00:00 Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada Donaldson, W. Steven Plint, A. Guy Longstaffe, Fred J. 1999 http://dx.doi.org/10.1046/j.1365-3091.1999.00271.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.1999.00271.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.1999.00271.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 46, issue 6, page 1159-1182 ISSN 0037-0746 1365-3091 journal-article 1999 crwiley https://doi.org/10.1046/j.1365-3091.1999.00271.x 2024-06-06T04:22:28Z The Late Coniacian, shallow‐marine Bad Heart Formation of the Western Canada foreland basin is very unusual in that it contains economically significant ooidal ironstone. Deposition of shallow‐water and iron‐rich facies appears to have been localized over the crest and flanks of a subtle intrabasinal arch, in part interpreted as a forebulge and partly attributed to reactivation of the long‐lived Peace River Arch. The formation comprises two upward‐shoaling allomembers, typically 5–10 m thick, that are bounded by regionally mappable ravinement surfaces. The lower unit, allomember 1, grades up from laminated mudstone to bioturbated silty sandstone, which is abruptly overlain by bioturbated ooidal silty sandstone grading into an almost clastic‐free ooidal ironstone up to 7 m thick. Ooidal ironstone was concentrated into NW‐ to SE‐trending ridges, kilometres wide and tens of kilometres long. Ironstone formation appears to have been promoted by: (a) drowning of the arch, which progressively curtailed sediment supply; and (b) enhanced reworking over the shallowly submerged arch and over a fault‐bounded block that underwent episodic vertical movement of 10–20 m during Bad Heart deposition. Allomember 2 also shoals upwards from mudstone to bioturbated and laminated silty sandstone but lacks ooids, apparently reflecting a rejuvenated supply of detrital sediment from the arch. The marine ravinement surface above allomember 2 is a Skolithos firmground, above which is developed a regional blanket of ooidal sediment. In the east, ooids are dispersed in a bioturbated silty sandstone with abundant evidence of repeated reworking and early siderite and phosphate cements. Westwards, this facies grades, over about 40 km, into almost clastic‐free ooidal ironstone about 5 m thick; the lateral facies change may reflect progressive clastic starvation distal to a low‐relief source area. The two allomembers are interpreted to reflect eustatic oscillations of about 10 m, superimposed on episodic tectonic warping and block‐faulting ... Article in Journal/Newspaper Peace River Wiley Online Library Bad Heart ENVELOPE(-118.303,-118.303,55.500,55.500) Canada The Arch ENVELOPE(-55.981,-55.981,49.700,49.700) Sedimentology 46 6 1159 1182 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The Late Coniacian, shallow‐marine Bad Heart Formation of the Western Canada foreland basin is very unusual in that it contains economically significant ooidal ironstone. Deposition of shallow‐water and iron‐rich facies appears to have been localized over the crest and flanks of a subtle intrabasinal arch, in part interpreted as a forebulge and partly attributed to reactivation of the long‐lived Peace River Arch. The formation comprises two upward‐shoaling allomembers, typically 5–10 m thick, that are bounded by regionally mappable ravinement surfaces. The lower unit, allomember 1, grades up from laminated mudstone to bioturbated silty sandstone, which is abruptly overlain by bioturbated ooidal silty sandstone grading into an almost clastic‐free ooidal ironstone up to 7 m thick. Ooidal ironstone was concentrated into NW‐ to SE‐trending ridges, kilometres wide and tens of kilometres long. Ironstone formation appears to have been promoted by: (a) drowning of the arch, which progressively curtailed sediment supply; and (b) enhanced reworking over the shallowly submerged arch and over a fault‐bounded block that underwent episodic vertical movement of 10–20 m during Bad Heart deposition. Allomember 2 also shoals upwards from mudstone to bioturbated and laminated silty sandstone but lacks ooids, apparently reflecting a rejuvenated supply of detrital sediment from the arch. The marine ravinement surface above allomember 2 is a Skolithos firmground, above which is developed a regional blanket of ooidal sediment. In the east, ooids are dispersed in a bioturbated silty sandstone with abundant evidence of repeated reworking and early siderite and phosphate cements. Westwards, this facies grades, over about 40 km, into almost clastic‐free ooidal ironstone about 5 m thick; the lateral facies change may reflect progressive clastic starvation distal to a low‐relief source area. The two allomembers are interpreted to reflect eustatic oscillations of about 10 m, superimposed on episodic tectonic warping and block‐faulting ... |
format |
Article in Journal/Newspaper |
author |
Donaldson, W. Steven Plint, A. Guy Longstaffe, Fred J. |
spellingShingle |
Donaldson, W. Steven Plint, A. Guy Longstaffe, Fred J. Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
author_facet |
Donaldson, W. Steven Plint, A. Guy Longstaffe, Fred J. |
author_sort |
Donaldson, W. Steven |
title |
Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
title_short |
Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
title_full |
Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
title_fullStr |
Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
title_full_unstemmed |
Tectonic and eustatic control on deposition and preservation of Upper Cretaceous ooidal ironstone and associated facies: Peace River Arch area, NW Alberta, Canada |
title_sort |
tectonic and eustatic control on deposition and preservation of upper cretaceous ooidal ironstone and associated facies: peace river arch area, nw alberta, canada |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1046/j.1365-3091.1999.00271.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3091.1999.00271.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3091.1999.00271.x |
long_lat |
ENVELOPE(-118.303,-118.303,55.500,55.500) ENVELOPE(-55.981,-55.981,49.700,49.700) |
geographic |
Bad Heart Canada The Arch |
geographic_facet |
Bad Heart Canada The Arch |
genre |
Peace River |
genre_facet |
Peace River |
op_source |
Sedimentology volume 46, issue 6, page 1159-1182 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3091.1999.00271.x |
container_title |
Sedimentology |
container_volume |
46 |
container_issue |
6 |
container_start_page |
1159 |
op_container_end_page |
1182 |
_version_ |
1802648851019988992 |