Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia
Two glacial episodes, the Sturtian (ca. 720 Ma) and Marinoan-Varangerian (ca, 590 Ma), characterize many Neoproterozoic successions worldwide. In contrast, northeast Laurentia is typically considered as containing only the latter; in Scotland and Ireland this is represented by the Port Askaig Tillit...
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/c20ffb62-8d0b-4729-abae-21e67dfb45ea 2024-06-23T07:54:31+00:00 Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia Condon, DJ Prave, Anthony Robert 2000-10 https://research-portal.st-andrews.ac.uk/en/researchoutput/two-from-donegal-neoproterozoic-glaciogenic-episodes-on-the-northeast-margin-of-laurentia(c20ffb62-8d0b-4729-abae-21e67dfb45ea).html http://www.scopus.com/inward/record.url?scp=0034431826&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/two-from-donegal-neoproterozoic-glaciogenic-episodes-on-the-northeast-margin-of-laurentia(c20ffb62-8d0b-4729-abae-21e67dfb45ea).html info:eu-repo/semantics/restrictedAccess Condon , DJ & Prave , A R 2000 , ' Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia ' , Geology , vol. 28 , pp. 951-954 . Neoproterozoic glaciation Dalradian Laurentia LOW-LATITUDE GLACIATION DALRADIAN SUPERGROUP MACKENZIE MOUNTAINS NORTHWESTERN CANADA U-PB SCOTLAND EVOLUTION SEDIMENTATION DEPOSITS EARTH article 2000 ftunstandrewcris 2024-06-13T00:10:12Z Two glacial episodes, the Sturtian (ca. 720 Ma) and Marinoan-Varangerian (ca, 590 Ma), characterize many Neoproterozoic successions worldwide. In contrast, northeast Laurentia is typically considered as containing only the latter; in Scotland and Ireland this is represented by the Port Askaig Tillite. Here we present evidence (ice-rafted debris) for a second, younger Neoproterozoic glacial event in the Dalradian Southern Highland Group of Donegal, Ireland. These deposits overlie strata correlative to ca. 595 Ma rocks in Scotland, making this heretofore unrecognized glacial episode a Marinoan-Varangerian equivalent. In that the Port Askaig occurs similar to 3-5 km stratigraphically below the Southern Highland Group rocks, it is most likely Sturtian, not Marinoan-Varangerian, in age. Thus, the Dalradian succession in the Irish Caledonides contains strata representing both the Sturtian and Marinoan-Varanger glaciations. Article in Journal/Newspaper Mackenzie mountains Varanger University of St Andrews: Research Portal Canada |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Neoproterozoic glaciation Dalradian Laurentia LOW-LATITUDE GLACIATION DALRADIAN SUPERGROUP MACKENZIE MOUNTAINS NORTHWESTERN CANADA U-PB SCOTLAND EVOLUTION SEDIMENTATION DEPOSITS EARTH |
spellingShingle |
Neoproterozoic glaciation Dalradian Laurentia LOW-LATITUDE GLACIATION DALRADIAN SUPERGROUP MACKENZIE MOUNTAINS NORTHWESTERN CANADA U-PB SCOTLAND EVOLUTION SEDIMENTATION DEPOSITS EARTH Condon, DJ Prave, Anthony Robert Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
topic_facet |
Neoproterozoic glaciation Dalradian Laurentia LOW-LATITUDE GLACIATION DALRADIAN SUPERGROUP MACKENZIE MOUNTAINS NORTHWESTERN CANADA U-PB SCOTLAND EVOLUTION SEDIMENTATION DEPOSITS EARTH |
description |
Two glacial episodes, the Sturtian (ca. 720 Ma) and Marinoan-Varangerian (ca, 590 Ma), characterize many Neoproterozoic successions worldwide. In contrast, northeast Laurentia is typically considered as containing only the latter; in Scotland and Ireland this is represented by the Port Askaig Tillite. Here we present evidence (ice-rafted debris) for a second, younger Neoproterozoic glacial event in the Dalradian Southern Highland Group of Donegal, Ireland. These deposits overlie strata correlative to ca. 595 Ma rocks in Scotland, making this heretofore unrecognized glacial episode a Marinoan-Varangerian equivalent. In that the Port Askaig occurs similar to 3-5 km stratigraphically below the Southern Highland Group rocks, it is most likely Sturtian, not Marinoan-Varangerian, in age. Thus, the Dalradian succession in the Irish Caledonides contains strata representing both the Sturtian and Marinoan-Varanger glaciations. |
format |
Article in Journal/Newspaper |
author |
Condon, DJ Prave, Anthony Robert |
author_facet |
Condon, DJ Prave, Anthony Robert |
author_sort |
Condon, DJ |
title |
Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
title_short |
Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
title_full |
Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
title_fullStr |
Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
title_full_unstemmed |
Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia |
title_sort |
two from donegal: neoproterozoic glaciogenic episodes on the northeast margin of laurentia |
publishDate |
2000 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/two-from-donegal-neoproterozoic-glaciogenic-episodes-on-the-northeast-margin-of-laurentia(c20ffb62-8d0b-4729-abae-21e67dfb45ea).html http://www.scopus.com/inward/record.url?scp=0034431826&partnerID=8YFLogxK |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Mackenzie mountains Varanger |
genre_facet |
Mackenzie mountains Varanger |
op_source |
Condon , DJ & Prave , A R 2000 , ' Two from Donegal: Neoproterozoic glaciogenic episodes on the northeast margin of Laurentia ' , Geology , vol. 28 , pp. 951-954 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/two-from-donegal-neoproterozoic-glaciogenic-episodes-on-the-northeast-margin-of-laurentia(c20ffb62-8d0b-4729-abae-21e67dfb45ea).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802646683959427072 |