Proto-basement in Svalbard
Candidates for possible Precambrian proto-basement throughout Svalbard are considered and evaluated. The paper provides a tectono-stratigraphic framework for consideration of new data. Proto-basement, in the sense of basement in Proterozoic time, implies the occurrence of a Precambrian tectonic even...
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Norwegian Polar Institute
1997
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Online Access: | https://polarresearch.net/index.php/polar/article/view/1914 https://doi.org/10.3402/polar.v16i2.6631 |
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ftjpolarres:oai:journals.openacademia.net:article/1914 2023-05-15T16:02:48+02:00 Proto-basement in Svalbard Harland, W. B. 1997-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/1914 https://doi.org/10.3402/polar.v16i2.6631 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/1914/5163 https://polarresearch.net/index.php/polar/article/view/1914 doi:10.3402/polar.v16i2.6631 Copyright (c) 2018 Polar Research Polar Research; Vol. 16 No. 2 (1997); 123-147 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1997 ftjpolarres https://doi.org/10.3402/polar.v16i2.6631 2021-11-11T19:11:42Z Candidates for possible Precambrian proto-basement throughout Svalbard are considered and evaluated. The paper provides a tectono-stratigraphic framework for consideration of new data. Proto-basement, in the sense of basement in Proterozoic time, implies the occurrence of a Precambrian tectonic event. Vendian rocks are widespread in Svalbard and, because there is no known Vendian major tectonic event, the search is narrowed to pre-Vendian rocks. The approach is primarily tectono-stratigraphic, to identify a significant break by unconformity, contrast in metamorphic facies and isotopic age determinations. The paper concludes that the following rock units are proto-basement: Isbjømhamna and (newly defined) Eimfjellet groups, Nordbukta Group, Magnethøgda Group, the Richarddalen Complex; the Atomfjella Complex, the Brennevinsfjorden Group and the granitoids related to the Kapp Hansteen Group and the Duvefjorden Complex. While considered unlikely to be proto-basement the following cannot be ruled out: the Mefonntoppane and Kistefjellet rocks and the Sigfredbogen unit, the blue-schist Vestgötabreen rocks, the Pinkie Formation and parts of the Kongsvegen Group. Terrane implications are consistent with the three terrane model of Harland & Wright (1979), modified by Harland et al. (1993); but the data presented here hardly constrain such a model. In so far as the conclusions here are valid the effect is to subtract from, rather than add to, the outcrops commonly mapped as likely proto-basement. Article in Journal/Newspaper Duvefjorden Polar Research Svalbard Polar Research (E-Journal) Svalbard Kongsvegen ENVELOPE(12.657,12.657,78.854,78.854) Duvefjorden ENVELOPE(23.607,23.607,80.285,80.285) Richarddalen ENVELOPE(12.333,12.333,79.667,79.667) Vestgötabreen ENVELOPE(12.800,12.800,78.450,78.450) Eimfjellet ENVELOPE(15.404,15.404,77.049,77.049) Brennevinsfjorden ENVELOPE(19.364,19.364,80.357,80.357) Kapp Hansteen ENVELOPE(19.030,19.030,80.347,80.347) Kistefjellet ENVELOPE(20.759,20.759,69.623,69.623) Magnethøgda ENVELOPE(14.886,14.886,77.490,77.490) Mefonntoppane ENVELOPE(16.480,16.480,76.855,76.855) Sigfredbogen ENVELOPE(15.698,15.698,76.923,76.923) Nordbukta ENVELOPE(8.005,8.005,63.096,63.096) Polar Research 16 2 123 147 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Candidates for possible Precambrian proto-basement throughout Svalbard are considered and evaluated. The paper provides a tectono-stratigraphic framework for consideration of new data. Proto-basement, in the sense of basement in Proterozoic time, implies the occurrence of a Precambrian tectonic event. Vendian rocks are widespread in Svalbard and, because there is no known Vendian major tectonic event, the search is narrowed to pre-Vendian rocks. The approach is primarily tectono-stratigraphic, to identify a significant break by unconformity, contrast in metamorphic facies and isotopic age determinations. The paper concludes that the following rock units are proto-basement: Isbjømhamna and (newly defined) Eimfjellet groups, Nordbukta Group, Magnethøgda Group, the Richarddalen Complex; the Atomfjella Complex, the Brennevinsfjorden Group and the granitoids related to the Kapp Hansteen Group and the Duvefjorden Complex. While considered unlikely to be proto-basement the following cannot be ruled out: the Mefonntoppane and Kistefjellet rocks and the Sigfredbogen unit, the blue-schist Vestgötabreen rocks, the Pinkie Formation and parts of the Kongsvegen Group. Terrane implications are consistent with the three terrane model of Harland & Wright (1979), modified by Harland et al. (1993); but the data presented here hardly constrain such a model. In so far as the conclusions here are valid the effect is to subtract from, rather than add to, the outcrops commonly mapped as likely proto-basement. |
format |
Article in Journal/Newspaper |
author |
Harland, W. B. |
spellingShingle |
Harland, W. B. Proto-basement in Svalbard |
author_facet |
Harland, W. B. |
author_sort |
Harland, W. B. |
title |
Proto-basement in Svalbard |
title_short |
Proto-basement in Svalbard |
title_full |
Proto-basement in Svalbard |
title_fullStr |
Proto-basement in Svalbard |
title_full_unstemmed |
Proto-basement in Svalbard |
title_sort |
proto-basement in svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
1997 |
url |
https://polarresearch.net/index.php/polar/article/view/1914 https://doi.org/10.3402/polar.v16i2.6631 |
long_lat |
ENVELOPE(12.657,12.657,78.854,78.854) ENVELOPE(23.607,23.607,80.285,80.285) ENVELOPE(12.333,12.333,79.667,79.667) ENVELOPE(12.800,12.800,78.450,78.450) ENVELOPE(15.404,15.404,77.049,77.049) ENVELOPE(19.364,19.364,80.357,80.357) ENVELOPE(19.030,19.030,80.347,80.347) ENVELOPE(20.759,20.759,69.623,69.623) ENVELOPE(14.886,14.886,77.490,77.490) ENVELOPE(16.480,16.480,76.855,76.855) ENVELOPE(15.698,15.698,76.923,76.923) ENVELOPE(8.005,8.005,63.096,63.096) |
geographic |
Svalbard Kongsvegen Duvefjorden Richarddalen Vestgötabreen Eimfjellet Brennevinsfjorden Kapp Hansteen Kistefjellet Magnethøgda Mefonntoppane Sigfredbogen Nordbukta |
geographic_facet |
Svalbard Kongsvegen Duvefjorden Richarddalen Vestgötabreen Eimfjellet Brennevinsfjorden Kapp Hansteen Kistefjellet Magnethøgda Mefonntoppane Sigfredbogen Nordbukta |
genre |
Duvefjorden Polar Research Svalbard |
genre_facet |
Duvefjorden Polar Research Svalbard |
op_source |
Polar Research; Vol. 16 No. 2 (1997); 123-147 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/1914/5163 https://polarresearch.net/index.php/polar/article/view/1914 doi:10.3402/polar.v16i2.6631 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v16i2.6631 |
container_title |
Polar Research |
container_volume |
16 |
container_issue |
2 |
container_start_page |
123 |
op_container_end_page |
147 |
_version_ |
1766398485908684800 |