Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden
The lower Cambrian Vakkejokk Breccia is a proximal ejecta layer from a shallow marine impact. It is exposed for ~7 km along a steep mountainside in Lapland, northernmost Sweden. In its central parts, the layer is up to ~27 m thick. Here the breccia shows a vertical differentiation into (1) a lower s...
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Online Access: | https://lup.lub.lu.se/record/5418d2eb-5d0a-4080-8973-2cd83be2f376 https://doi.org/10.1111/maps.13275 |
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ftulundlup:oai:lup.lub.lu.se:5418d2eb-5d0a-4080-8973-2cd83be2f376 2023-05-15T17:40:18+02:00 Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden Ormö, J. Minde, P. Nielsen, A. T. Alwmark, C. 2019 https://lup.lub.lu.se/record/5418d2eb-5d0a-4080-8973-2cd83be2f376 https://doi.org/10.1111/maps.13275 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/5418d2eb-5d0a-4080-8973-2cd83be2f376 http://dx.doi.org/10.1111/maps.13275 scopus:85063258210 Meteoritics and Planetary Science; 54(6), pp 1246-1261 (2019) ISSN: 1086-9379 Geology contributiontojournal/article info:eu-repo/semantics/article text 2019 ftulundlup https://doi.org/10.1111/maps.13275 2023-02-01T23:37:10Z The lower Cambrian Vakkejokk Breccia is a proximal ejecta layer from a shallow marine impact. It is exposed for ~7 km along a steep mountainside in Lapland, northernmost Sweden. In its central parts, the layer is up to ~27 m thick. Here the breccia shows a vertical differentiation into (1) a lower subunit consisting of strongly deformed target sediments mixed with up to decameter size, mainly crystalline basement clasts (i.e., lower polymict breccia [LPB]); (2) a middle subunit consisting of a polymict, blocky to gravelly breccia, commonly graded (i.e., graded polymict breccia [GPB]), that, in turn, is sporadically overlain by (3) a few dm thick, sandy bed (i.e., top sandstone [TS]). Previous work interpreted the graded beds as deposited by resurging water during early crater modification. We made three short (<1.35 m) core drillings through the graded beds. The line-logging technique previously used on cores from other marine-target craters was complemented by logging of equal-sized cells in photos made along the cores. Granulometry and clast lithology determinations provide further evidence for the top beds of the breccia being resurge deposits. However, the magnitude of this resurge can only be assessed by future deep core drilling of the infill of the crater hidden below the mountain. Article in Journal/Newspaper North Sweden Lapland Lund University Publications (LUP) Meteoritics & Planetary Science 54 6 1246 1261 |
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Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Ormö, J. Minde, P. Nielsen, A. T. Alwmark, C. Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
topic_facet |
Geology |
description |
The lower Cambrian Vakkejokk Breccia is a proximal ejecta layer from a shallow marine impact. It is exposed for ~7 km along a steep mountainside in Lapland, northernmost Sweden. In its central parts, the layer is up to ~27 m thick. Here the breccia shows a vertical differentiation into (1) a lower subunit consisting of strongly deformed target sediments mixed with up to decameter size, mainly crystalline basement clasts (i.e., lower polymict breccia [LPB]); (2) a middle subunit consisting of a polymict, blocky to gravelly breccia, commonly graded (i.e., graded polymict breccia [GPB]), that, in turn, is sporadically overlain by (3) a few dm thick, sandy bed (i.e., top sandstone [TS]). Previous work interpreted the graded beds as deposited by resurging water during early crater modification. We made three short (<1.35 m) core drillings through the graded beds. The line-logging technique previously used on cores from other marine-target craters was complemented by logging of equal-sized cells in photos made along the cores. Granulometry and clast lithology determinations provide further evidence for the top beds of the breccia being resurge deposits. However, the magnitude of this resurge can only be assessed by future deep core drilling of the infill of the crater hidden below the mountain. |
format |
Article in Journal/Newspaper |
author |
Ormö, J. Minde, P. Nielsen, A. T. Alwmark, C. |
author_facet |
Ormö, J. Minde, P. Nielsen, A. T. Alwmark, C. |
author_sort |
Ormö, J. |
title |
Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
title_short |
Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
title_full |
Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
title_fullStr |
Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
title_full_unstemmed |
Resurge deposits associated with the shallow marine early Cambrian Vakkejokk impact, north Sweden |
title_sort |
resurge deposits associated with the shallow marine early cambrian vakkejokk impact, north sweden |
publisher |
Wiley-Blackwell |
publishDate |
2019 |
url |
https://lup.lub.lu.se/record/5418d2eb-5d0a-4080-8973-2cd83be2f376 https://doi.org/10.1111/maps.13275 |
genre |
North Sweden Lapland |
genre_facet |
North Sweden Lapland |
op_source |
Meteoritics and Planetary Science; 54(6), pp 1246-1261 (2019) ISSN: 1086-9379 |
op_relation |
https://lup.lub.lu.se/record/5418d2eb-5d0a-4080-8973-2cd83be2f376 http://dx.doi.org/10.1111/maps.13275 scopus:85063258210 |
op_doi |
https://doi.org/10.1111/maps.13275 |
container_title |
Meteoritics & Planetary Science |
container_volume |
54 |
container_issue |
6 |
container_start_page |
1246 |
op_container_end_page |
1261 |
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1766141192457682944 |