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Coordinates: 60°9′N 20°6′E / 60.150°N 20.100°E

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Lumparn
Lumpari
Lumparn with the impact structure area in grey
Impact crater/structure
Confidence	Confirmed
Diameter	9 km (5.6 mi)
Age	~1000 Ma Proterozoic
Exposed	No
Drilled	Yes
Location
Location	Fasta Åland
Coordinates	60°9′N 20°6′E / 60.150°N 20.100°E / 60.150; 20.100
Country	Finland
Province	Åland
District	Åland
Municipality	Sund, Lumparland, Lemland & Jomala
Location of the crater in the Botnian Gulf

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).^[1] 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^[2] in some Finnish documents, though the Research Institute for the Languages of Finland does not list Lumpari as in current usage.^[3]

Gallery

References

^ "Lumparn". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-15.
^ Lumpari World Water Features Database | WorldCityDB.com Archived 2007-09-27 at the Wayback Machine
^ Svenska Ortnamn i Finland Archived 2007-11-13 at the Wayback Machine, The Research Institute for the Languages of Finland, see "Lumparn"

External links

Lumparn impact structure (archived link)
(in Finnish) The Landforms of Finland
Svensson, N.-B. (1993). "Lumparn Bay: A Meteorite Impact Crater in the Aland Archipelago, Southwest Finland". Meteoritics. 28 (3): 445. Bibcode:1993Metic..28S.445S.
Map of Lumparn

v t e Impact cratering on Earth
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Topics	Alvarez hypothesis Australite Breccia Coesite Complex crater Cretaceous–Paleogene boundary Cryptoexplosion Ejecta blanket Impact crater Impact structure Impactite Late Heavy Bombardment Lechatelierite Meteorite Moldavite Ordovician meteor event Philippinite Planar deformation features Shatter cone Shock metamorphism Shocked quartz Stishovite Suevite Tektite
Research	Ralph Belknap Baldwin Daniel Barringer Barringer Medal Edward C. T. Chao Robert S. Dietz William Kenneth Hartmann H. Jay Melosh Graham Ryder Peter H. Schultz Eugene Merle Shoemaker Earth Impact Database Impact Field Studies Group Lunar and Planetary Institute Traces of Catastrophe

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