Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone
The Late Proterozoic Rock Harbour Group, as exposed on the Flat Islands, Placentia Bay, consists of a 700 m thick fining-upward sequence of deep-water conglomerates, pebbly sandstones, and thinly-bedded siltstones, capped by a chaotic olistostrome. This sequence rests unconformably on sediments and...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1981
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e81-043 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-043 |
id |
crcansciencepubl:10.1139/e81-043 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e81-043 2023-12-17T10:44:57+01:00 Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone Hiscott, Richard N. 1981 http://dx.doi.org/10.1139/e81-043 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-043 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 18, issue 3, page 495-508 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1981 crcansciencepubl https://doi.org/10.1139/e81-043 2023-11-19T13:39:41Z The Late Proterozoic Rock Harbour Group, as exposed on the Flat Islands, Placentia Bay, consists of a 700 m thick fining-upward sequence of deep-water conglomerates, pebbly sandstones, and thinly-bedded siltstones, capped by a chaotic olistostrome. This sequence rests unconformably on sediments and pillowed tholeiitic basalts of the Burin Group, which were deformed, eroded, and then exposed on the sea floor before Rock Harbour deposition. The conglomerates, sandstones, and siltstones of the Rock Harbour Group may have been deposited within a deep slope canyon cut into the Burin Group, or in a perched slope basin at the margin of the rift system, which was initiated immediately before extrusion of the oceanic tholeiites that characterize the Burin Group. Remarkably good analogues for these two depositional settings can be found in the modern Gulf of California.Although the precise age of the Rock Harbour Group is uncertain, it may be a deep-water equivalent of mixtites found within the Conception Group in the eastern Avalon Zone. However, lithologically similar deep-water sandstones and conglomerates spanning the entire period of development of the Burin Rift Zone may be present in the vicinity of Placentia Bay. If so, then it is reasonable to expect a considerable range in the ages of these units from place to place. Article in Journal/Newspaper Newfoundland Flat Islands Canadian Science Publishing (via Crossref) Flat Islands ENVELOPE(62.780,62.780,-67.591,-67.591) Canadian Journal of Earth Sciences 18 3 495 508 |
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 Hiscott, Richard N. Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
topic_facet |
General Earth and Planetary Sciences |
description |
The Late Proterozoic Rock Harbour Group, as exposed on the Flat Islands, Placentia Bay, consists of a 700 m thick fining-upward sequence of deep-water conglomerates, pebbly sandstones, and thinly-bedded siltstones, capped by a chaotic olistostrome. This sequence rests unconformably on sediments and pillowed tholeiitic basalts of the Burin Group, which were deformed, eroded, and then exposed on the sea floor before Rock Harbour deposition. The conglomerates, sandstones, and siltstones of the Rock Harbour Group may have been deposited within a deep slope canyon cut into the Burin Group, or in a perched slope basin at the margin of the rift system, which was initiated immediately before extrusion of the oceanic tholeiites that characterize the Burin Group. Remarkably good analogues for these two depositional settings can be found in the modern Gulf of California.Although the precise age of the Rock Harbour Group is uncertain, it may be a deep-water equivalent of mixtites found within the Conception Group in the eastern Avalon Zone. However, lithologically similar deep-water sandstones and conglomerates spanning the entire period of development of the Burin Rift Zone may be present in the vicinity of Placentia Bay. If so, then it is reasonable to expect a considerable range in the ages of these units from place to place. |
format |
Article in Journal/Newspaper |
author |
Hiscott, Richard N. |
author_facet |
Hiscott, Richard N. |
author_sort |
Hiscott, Richard N. |
title |
Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
title_short |
Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
title_full |
Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
title_fullStr |
Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
title_full_unstemmed |
Stratigraphy and sedimentology of the Late Proterozoic Rock Harbour Group, Flat Islands, Placentia Bay, Newfoundland Avalon Zone |
title_sort |
stratigraphy and sedimentology of the late proterozoic rock harbour group, flat islands, placentia bay, newfoundland avalon zone |
publisher |
Canadian Science Publishing |
publishDate |
1981 |
url |
http://dx.doi.org/10.1139/e81-043 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-043 |
long_lat |
ENVELOPE(62.780,62.780,-67.591,-67.591) |
geographic |
Flat Islands |
geographic_facet |
Flat Islands |
genre |
Newfoundland Flat Islands |
genre_facet |
Newfoundland Flat Islands |
op_source |
Canadian Journal of Earth Sciences volume 18, issue 3, page 495-508 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e81-043 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
18 |
container_issue |
3 |
container_start_page |
495 |
op_container_end_page |
508 |
_version_ |
1785564592624107520 |