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Impact origin for the Hummeln Structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body

C. Alwmark, L. Ferriere, S. Holm-Alwmark, J. Ormoe, H. Leroux and E. Sturkell
Impact origin for the Hummeln Structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body
Geology (Boulder) (February 2015) 43 (4): 279-282

Abstract

Several studies of meteorites show that a large disruption of an asteroid occurred ca. 470 Ma in our solar system's asteroid belt. As a consequence, a large number of meteorite impacts occurred on Earth during the following few million years. The finding and characterization, for the first time, of planar deformation features in quartz grains from rocks collected at the Middle Ordovician Hummeln structure (Sweden) prove the hypervelocity impact origin of the structure. The unambiguous shock features allow us to close an approximately 200-yr-old discussion about its origin, and further the hypothesis of enhanced asteroid bombardment during the Middle Ordovician, adding an impact crater to the increasing number confirmed and properly dated from this period. Despite its relatively small size ( approximately 1.2 km in diameter), similar to the young Meteor Crater (Arizona, USA), and its old age, the Hummeln structure is remarkably well preserved, contradicting the general assumption that small craters are not preserved on Earth for more than a few tens of thousands to a couple of million years.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 4
Title: Impact origin for the Hummeln Structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body
Affiliation: Lund University, Department of Geology, Lund, Sweden
Pages: 279-282
Published: 20150218
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 33
Accession Number: 2015-021936
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
Secondary Affiliation: Natural History Museum, AUT, AustriaInstituto Nacional de Tecnica Aeroespacial, ESP, SpainUniversite Lille 1, FRA, FranceUniversity of Goteborg, SWE, Sweden
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201511
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