Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland)
The possibility that the Avalon Platform, where the Avalonian lithotectonic belt is best developed, was involved in late Paleozoic displacement was tested by paleomagnetic study of red sandstones of the Upper Devonian Terrenceville Formation of eastern Newfoundland. Two magnetization directions were...
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ftdatacite:10.7916/d8154sj8 2023-05-15T17:21:51+02:00 Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) Kent, Dennis V. 1982 https://dx.doi.org/10.7916/d8154sj8 https://academiccommons.columbia.edu/doi/10.7916/D8154SJ8 unknown Columbia University Geophysics Text Articles article-journal ScholarlyArticle 1982 ftdatacite https://doi.org/10.7916/d8154sj8 2021-11-05T12:55:41Z The possibility that the Avalon Platform, where the Avalonian lithotectonic belt is best developed, was involved in late Paleozoic displacement was tested by paleomagnetic study of red sandstones of the Upper Devonian Terrenceville Formation of eastern Newfoundland. Two magnetization directions were identified by thermal demagnetization analysis of 60 oriented samples from 10 sites: a high blocking temperature, thermally discrete A component of normal and reversed polarity, and an intermediate blocking temperature, thermally distributed B component of reversed polarity. The B component (D = 185.9°, I = -3.3°, a_95 = 7.2° for N = 8 sites) is interpreted as a postfolding secondary magnetization and gives a paleomagnetic pole position (latitude = 43.6°N, longitude = 117.1°E) near Early to Late Permian paleopoles for North America. The A component (D = 181.6°,I = 28.0°, a_95 = 10.1° for N = 9 sites) is interpreted as the characteristic magnetization possibly dating from near the time of deposition of the Terrence ville Formation. The corresponding paleomagnetic pole position (latitude = 27.4°N, longitude = 123.5°E) falls within a group of Late Devonian-early Carboniferous paleopoles obtained from the Acadia displaced terrain, encompassing the coastal areas of New England and the Canadian maritimes which form another part of the Avalonian belt. These paleopoles are systematically offset by 15° to 20° in latitude from coeval pole positions obtained from cratonic North America. Thus the Avalonian belt of the northern Appalachians, which is thought to represent a remnant of a Precambrian and early Paleozoic microcontinent on tectonostratigraphic considerations, appears to correspond to a late Paleozoic displaced terrain on the basis of paleomagnetic evidence. Text Newfoundland DataCite Metadata Store (German National Library of Science and Technology) |
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Geophysics Kent, Dennis V. Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
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Geophysics |
description |
The possibility that the Avalon Platform, where the Avalonian lithotectonic belt is best developed, was involved in late Paleozoic displacement was tested by paleomagnetic study of red sandstones of the Upper Devonian Terrenceville Formation of eastern Newfoundland. Two magnetization directions were identified by thermal demagnetization analysis of 60 oriented samples from 10 sites: a high blocking temperature, thermally discrete A component of normal and reversed polarity, and an intermediate blocking temperature, thermally distributed B component of reversed polarity. The B component (D = 185.9°, I = -3.3°, a_95 = 7.2° for N = 8 sites) is interpreted as a postfolding secondary magnetization and gives a paleomagnetic pole position (latitude = 43.6°N, longitude = 117.1°E) near Early to Late Permian paleopoles for North America. The A component (D = 181.6°,I = 28.0°, a_95 = 10.1° for N = 9 sites) is interpreted as the characteristic magnetization possibly dating from near the time of deposition of the Terrence ville Formation. The corresponding paleomagnetic pole position (latitude = 27.4°N, longitude = 123.5°E) falls within a group of Late Devonian-early Carboniferous paleopoles obtained from the Acadia displaced terrain, encompassing the coastal areas of New England and the Canadian maritimes which form another part of the Avalonian belt. These paleopoles are systematically offset by 15° to 20° in latitude from coeval pole positions obtained from cratonic North America. Thus the Avalonian belt of the northern Appalachians, which is thought to represent a remnant of a Precambrian and early Paleozoic microcontinent on tectonostratigraphic considerations, appears to correspond to a late Paleozoic displaced terrain on the basis of paleomagnetic evidence. |
format |
Text |
author |
Kent, Dennis V. |
author_facet |
Kent, Dennis V. |
author_sort |
Kent, Dennis V. |
title |
Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
title_short |
Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
title_full |
Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
title_fullStr |
Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
title_full_unstemmed |
Paleomagnetic Evidence for Post-Devonian Displacement of the Avalon Platform (Newfoundland) |
title_sort |
paleomagnetic evidence for post-devonian displacement of the avalon platform (newfoundland) |
publisher |
Columbia University |
publishDate |
1982 |
url |
https://dx.doi.org/10.7916/d8154sj8 https://academiccommons.columbia.edu/doi/10.7916/D8154SJ8 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_doi |
https://doi.org/10.7916/d8154sj8 |
_version_ |
1766107695126937600 |