The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general
Abstract Upper Precambrian diamictites in Varangerfjorden (northern Norway) have been examined for evidence of origin, whether glaciogenic, gravity flow or polygenetic. Studies of geomorphology, sedimentology and surface microtextures on quartz sand grains are integrated to provide multiple pieces o...
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2017
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crdegruyter:10.1515/logos-2017-0019 2023-05-15T17:43:19+02:00 The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general Molén, Mats O. 2017 http://dx.doi.org/10.1515/logos-2017-0019 http://content.sciendo.com/view/journals/logos/23/3/article-p163.xml https://www.sciendo.com/article/10.1515/logos-2017-0019 en eng Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Geologos volume 23, issue 3, page 163-181 ISSN 2080-6574 General Earth and Planetary Sciences journal-article 2017 crdegruyter https://doi.org/10.1515/logos-2017-0019 2022-07-08T14:11:53Z Abstract Upper Precambrian diamictites in Varangerfjorden (northern Norway) have been examined for evidence of origin, whether glaciogenic, gravity flow or polygenetic. Studies of geomorphology, sedimentology and surface microtextures on quartz sand grains are integrated to provide multiple pieces of evidence for the geological agents responsible for the origin of the diamictites. The documented sedimentary and erosional structures, formerly interpreted in a glaciogenic context (e.g., diamict structure, pavements and striations) have been reanalysed. Field and laboratory data demonstrate that, contrary to conclusions reached in many earlier studies, the diamictites and adjacent deposits did not originate from glaciogenic processes. Evidence from macrostructures may occasionally be equivocal or can be interpreted as representing reworked, glacially derived material. Evidence from surface microtextures, from outcrops which are believed to exhibit the most unequivocal signs for glaciation, display no imprint at all of glaciogenic processes, and a multicyclical origin of the deposits can be demonstrated. The geological context implies (and no geological data contradict this) an origin by gravity flows, possibly in a submarine fan environment. This reinterpretation of the diamictites in northern Norway may imply that the palaeoclimatological hypothesis of a deep frozen earth during parts of the Neoproterozoic has to be revised. Article in Journal/Newspaper Northern Norway Varangerfjord* Varangerfjorden De Gruyter (via Crossref) Norway Varangerfjorden ENVELOPE(30.000,30.000,70.000,70.000) Geologos 23 3 163 181 |
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De Gruyter (via Crossref) |
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English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Molén, Mats O. The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
topic_facet |
General Earth and Planetary Sciences |
description |
Abstract Upper Precambrian diamictites in Varangerfjorden (northern Norway) have been examined for evidence of origin, whether glaciogenic, gravity flow or polygenetic. Studies of geomorphology, sedimentology and surface microtextures on quartz sand grains are integrated to provide multiple pieces of evidence for the geological agents responsible for the origin of the diamictites. The documented sedimentary and erosional structures, formerly interpreted in a glaciogenic context (e.g., diamict structure, pavements and striations) have been reanalysed. Field and laboratory data demonstrate that, contrary to conclusions reached in many earlier studies, the diamictites and adjacent deposits did not originate from glaciogenic processes. Evidence from macrostructures may occasionally be equivocal or can be interpreted as representing reworked, glacially derived material. Evidence from surface microtextures, from outcrops which are believed to exhibit the most unequivocal signs for glaciation, display no imprint at all of glaciogenic processes, and a multicyclical origin of the deposits can be demonstrated. The geological context implies (and no geological data contradict this) an origin by gravity flows, possibly in a submarine fan environment. This reinterpretation of the diamictites in northern Norway may imply that the palaeoclimatological hypothesis of a deep frozen earth during parts of the Neoproterozoic has to be revised. |
format |
Article in Journal/Newspaper |
author |
Molén, Mats O. |
author_facet |
Molén, Mats O. |
author_sort |
Molén, Mats O. |
title |
The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
title_short |
The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
title_full |
The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
title_fullStr |
The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
title_full_unstemmed |
The origin of upper Precambrian diamictites, northern Norway: a case study applicable to diamictites in general |
title_sort |
origin of upper precambrian diamictites, northern norway: a case study applicable to diamictites in general |
publisher |
Walter de Gruyter GmbH |
publishDate |
2017 |
url |
http://dx.doi.org/10.1515/logos-2017-0019 http://content.sciendo.com/view/journals/logos/23/3/article-p163.xml https://www.sciendo.com/article/10.1515/logos-2017-0019 |
long_lat |
ENVELOPE(30.000,30.000,70.000,70.000) |
geographic |
Norway Varangerfjorden |
geographic_facet |
Norway Varangerfjorden |
genre |
Northern Norway Varangerfjord* Varangerfjorden |
genre_facet |
Northern Norway Varangerfjord* Varangerfjorden |
op_source |
Geologos volume 23, issue 3, page 163-181 ISSN 2080-6574 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1515/logos-2017-0019 |
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Geologos |
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23 |
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3 |
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163 |
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181 |
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