Lumparn
{{Infobox terrestrial impact site
| name = Lumparn
| other_name = Lumpari
| photo = Lumparn.png
| photo_size =
| photo_alt =
| photo_caption = Lumparn with the impact structure area in grey
| map = Finland
| map_alt =
| map_caption = Location of the crater in the Botnian Gulf
| map_size = 250
| location = Fasta Åland
| label =
| label_position =
| coordinates = {{coord|60|9|N|20|6|E|display=inline,title}}
| coordinates_ref =
| confidence = Confirmed
| diameter = {{convert|9|km|mi|abbr=on}}
| depth =
| rise =
| imp_size =
| age = ~1000 Ma
Proterozoic
| exposed = No
| drilled = Yes
| bolide =
| translation =
| language =
| pronunciation =
| topo =
| access =
| country = {{flag|Finland}}
| state =
| province = Åland
| district = Åland
| municipality = Sund, Lumparland, Lemland & Jomala
}}
Lumparn (fi. Lumpari) is a large bay devoid of islands in the main island of Åland, Finland, bordered by Sund to the north, Lumparland to the east, Lemland to the south and Jomala to the west.
Description
Most of the bay fills a nine kilometer wide impact structure. The structure is estimated to be about 1000 million years old (Proterozoic).{{cite Earth Impact DB | name = Lumparn| accessdate = 2009-08-15}} The depression was originally believed to be a rift. Extraterrestrial origin was first proposed in 1979, but not until 1993 was the impact structure finally confirmed. Long shatter cones have been discovered in the southwestern part of the bay. The remains of the crater are filled with sediments. Between Pleistocene sediments and crushed rapakivi granite bedrock there is a layer of Paleozoic (Ordovician) limestones. This makes Lumparn one of the few places in Finland where fossils have been found.
The bay has also previously been referred to as Lumpari[http://water.worldcitydb.com/lumpari_1978598.html Lumpari World Water Features Database | WorldCityDB.com] {{webarchive|url=https://web.archive.org/web/20070927035612/http://water.worldcitydb.com/lumpari_1978598.html |date=2007-09-27 }} in some Finnish documents, though the Research Institute for the Languages of Finland does not list Lumpari as in current usage.[http://kaino.kotus.fi/www/verkkojulkaisut/ortnamn/ortnamn2.html#L Svenska Ortnamn i Finland] {{webarchive|url=https://web.archive.org/web/20071113223403/http://kaino.kotus.fi/www/verkkojulkaisut/ortnamn/ortnamn2.html |date=2007-11-13 }}, The Research Institute for the Languages of Finland, see "Lumparn"
Gallery
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See also
References
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External links
- [https://web.archive.org/web/20070927213438/http://www.somerikko.net/old/geo/imp/lumpa_e.htm Lumparn impact structure] (archived link)
- {{in lang|fi}} [http://www.helsinki.fi/ml/maant/suomi.html The Landforms of Finland]
- {{cite journal | author=Svensson, N.-B. | title=Lumparn Bay: A Meteorite Impact Crater in the Aland Archipelago, Southwest Finland | journal=Meteoritics | year=1993 | volume=28 | issue=3 | pages=445 | bibcode=1993Metic..28S.445S }}
- [https://www.openstreetmap.org/#map=12/60.15/20.13333 Map of Lumparn]
{{Impact cratering on Earth}}
Category:Impact craters of Finland
Category:Proterozoic impact craters
Category:Mesoproterozoic Europe
{{Åland-geo-stub}}