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

Alwmark, Carl LU ; Ferriere, L.; Alwmark, Sanna LU ; Ormoe, J.; Leroux, H. and Sturkell, E. (2015) In Geology 43(4). p.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 similar to 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... (More)
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 similar to 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 (similar to 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geology
volume
43
issue
4
pages
279 - 282
publisher
Geological Society of America
external identifiers
  • wos:000352097900007
  • scopus:84948614732
ISSN
0091-7613
DOI
10.1130/G36429.1
language
English
LU publication?
yes
id
39a722cc-4331-4626-b851-5a700d552388 (old id 5277800)
date added to LUP
2015-04-24 09:33:08
date last changed
2017-01-01 06:21:08
@article{39a722cc-4331-4626-b851-5a700d552388,
  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 similar to 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 (similar to 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.},
  author       = {Alwmark, Carl and Ferriere, L. and Alwmark, Sanna and Ormoe, J. and Leroux, H. and Sturkell, E.},
  issn         = {0091-7613},
  language     = {eng},
  number       = {4},
  pages        = {279--282},
  publisher    = {Geological Society of America},
  series       = {Geology},
  title        = {Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body},
  url          = {http://dx.doi.org/10.1130/G36429.1},
  volume       = {43},
  year         = {2015},
}