Suvasvesi
Encyclopedia
Suvasvesi is a lake
in Eastern Finland
near the town of Kuopio
. Suvasvesi consists of two circular open lakes, Kuukkarinselkä in north and Haapaselkä in south. The lakes are separated by a group of islands. The lake has 688 islands in total. The area of the lake is 234 km² making it the 18th largest lake in Finland. Kuukkarinselkä is the third deepest lake in Finland measuring 89.0 m in the deepest point.
In 2001 shatter cone
s were found in Kuukkarinselkä making it the 6th known impact crater
in Finland. The crater, usually referred as Suvasvesi North crater, is located in the center of Kuukkarinselkä and measures about 3.5 km in diameter. Its age is still poorly known (but estimated to be 780 Ma or 240 Ma by paleomagnetic
dating).
Haapaselkä resembles the northern counterpart and it was also suspected to be an impact crater. Haapaselkä crater is usually referred as Suvasvesi South crater. It is similar in size, and the age of the crater is older than 700 Ma (probably about 710-720 Ma) based on argon-argon dating
of impact melt rocks
found near the southeastern shore of Lake Haapaselkä. It may be related to the Suvasvesi North making the Suvasvesi structure a very rare double impact crater.
Lake
A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...
in Eastern Finland
Finland
Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...
near the town of Kuopio
Kuopio
Kuopio is a city and a municipality located in the region of Northern Savonia, Finland. A population of makes it the ninth biggest city in the country. The city has a total area of , of which is water and half forest...
. Suvasvesi consists of two circular open lakes, Kuukkarinselkä in north and Haapaselkä in south. The lakes are separated by a group of islands. The lake has 688 islands in total. The area of the lake is 234 km² making it the 18th largest lake in Finland. Kuukkarinselkä is the third deepest lake in Finland measuring 89.0 m in the deepest point.
In 2001 shatter cone
Shatter cone
Shatter cones are rare geological features that are only known to form in the bedrock beneath meteorite impact craters or underground nuclear explosions...
s were found in Kuukkarinselkä making it the 6th known impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
in Finland. The crater, usually referred as Suvasvesi North crater, is located in the center of Kuukkarinselkä and measures about 3.5 km in diameter. Its age is still poorly known (but estimated to be 780 Ma or 240 Ma by paleomagnetic
Paleomagnetism
Paleomagnetism is the study of the record of the Earth's magnetic field in rocks. Certain minerals in rocks lock-in a record of the direction and intensity of the magnetic field when they form. This record provides information on the past behavior of Earth's magnetic field and the past location of...
dating).
Haapaselkä resembles the northern counterpart and it was also suspected to be an impact crater. Haapaselkä crater is usually referred as Suvasvesi South crater. It is similar in size, and the age of the crater is older than 700 Ma (probably about 710-720 Ma) based on argon-argon dating
Argon-argon dating
Argon-argon dating is a radiometric dating method invented to supersede potassium-argon dating in accuracy. The older method required two samples for dating while the newer method requires only one...
of impact melt rocks
Impactite
Impactite is an informal term describing a rock created or modified by the impact of a meteorite. The term encompasses shock-metamorphosed target rocks, melts and mixtures of the two, as well as sedimentary rocks with significant impact-derived components .-Some localities:*Nördlinger Ries...
found near the southeastern shore of Lake Haapaselkä. It may be related to the Suvasvesi North making the Suvasvesi structure a very rare double impact crater.