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Impact cratering record of Sweden; a review

Sanna Holm-Alwmark
Impact cratering record of Sweden; a review (in Large meteorite impacts and planetry evolution VI, Wolf Uwe Reimold (editor) and Christian Koeberl (editor))
Special Paper - Geological Society of America (August 2021) 550: 1-39

Abstract

Studies of impact structures in Sweden date back almost 60 years. They have so far resulted in the confirmation and understanding of eight impact structures and one impact-derived breccia layer, including the largest confirmed impact structure in the western part of Europe, the Siljan impact structure. Several additional structures have been proposed as impact derived, but they have to date not been confirmed. In this contribution, I summarize the current state of knowledge about the impact cratering record of Sweden. This is an up-to-date, comprehensive review of the features of known impact structures (and impact-related deposits) in Sweden. The described impact structures formed over a time period spanning from the Cambrian to the Cretaceous, and the preservation of several small ( approximately 1-2 km in diameter) Paleozoic impact structures indicates that the conditions securing their protection were close to optimal, with formation in a shallow epicontinental sea and rapid cover by protective sediments followed by a regional geologic evolution permitting their preservation. The generally well-preserved state of some of these crater structures contradicts the general assumption that such small impact structures can only be preserved for approximately a couple of thousand to a few million years. The Lockne-Malingen, Tvaren, Granby, and Hummeln impact structures all have ages that place their formation in a period of proposed increased cratering rate on Earth following the breakup event of the L-chondrite parent body in the asteroid belt. However, to date, evidence other than a temporal correlation is missing for all of these structures except for Lockne (and Malingen), which has been shown to have formed by the impact of an L-chondritic body.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 550
Title: Impact cratering record of Sweden; a review
Title: Large meteorite impacts and planetry evolution VI
Author(s): Holm-Alwmark, Sanna
Author(s): Reimold, Wolf Uweeditor
Author(s): Koeberl, Christianeditor
Affiliation: University of Copenhagen, Niels Bohr Institute, Copenhagen, Denmark
Affiliation: Universidade de Brasilia, Instituto de Geociencias, Brasilia, Brazil
Pages: 1-39
Published: 20210802
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 9780813795508
Meeting name: Large meteorite impacts and planetary evolution conference VI (LMI VI)
Meeting location: Brasilia, BRA, Brazil
Meeting date: 20190930Sept. 30-Oct. 3, 2019
References: 266
Accession Number: 2021-075721
Categories: Extraterrestrial geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 3 tables, geol. sketch map
N60°45'00" - N61°15'00", E14°25'00" - E15°30'00"
N63°00'00" - N63°00'00", E14°49'00" - E14°49'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute.
Update Code: 202152
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