Anabar Shield (russian: Анабарский щит) is a

shield A shield is a piece of personal armour held in the hand, which may or may not be strapped to the wrist or forearm. Shields are used to intercept specific attacks, whether from close-ranged weaponry or projectiles such as arrows, by means of ...

Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part ...

. It is an exposed

basement A basement or cellar is one or more Storey, floors of a building that are completely or partly below the storey, ground floor. It generally is used as a utility space for a building, where such items as the Furnace (house heating), furnace, ...

of the

Siberian Craton Siberia, also known as Angaraland (or simply Angara) and Angarida, is an ancient craton in the heart of Siberia. Today forming the Central Siberian Plateau, it was an independent continent before the Permian period. The Verkhoyansk Sea, a passive ...

. Together with the Aldan Shield to the southeast, the Anabar Shield is one of the main features of the

craton A craton (, , or ; from grc-gre, κράτος "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle. Having often survived cycles of merging and ...

. On the surface it appears as an upland of moderate height, built of

gneiss Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures a ...

es and crystalline

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especiall ...

s folded in the

Archean The Archean Eon ( , also spelled Archaean or Archæan) is the second of four geologic eons of Earth's history, representing the time from . The Archean was preceded by the Hadean Eon and followed by the Proterozoic. The Earth during the Arc ...

. There are numerous dislocations and intrusions. The outer zone has slightly undulated layers of

Proterozoic The Proterozoic () is a geological eon spanning the time interval from 2500 to 538.8million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided i ...

deposits.Анабарский массив

Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; ) is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Bolshaya rossiyskaya e ...

The Anabar Shield coincides geographically with the

Anabar Plateau The Anabar Plateau ( rus, Анабарское плато) is a mountain plateau in Krasnoyarsk Krai and the Sakha Republic (Yakutia), Siberia, Russia. The plateau is in a latitude dominated by permafrost. The permafrost thickness under the Anab ...

, located at the northern end of the

Central Siberian Plateau The Central Siberian Plateau (russian: Среднесибирское плоскогорье, Srednesibirskoye ploskogorye; sah, Орто Сибиир хаптал хайалаах сирэ) is a vast mountainous area in Siberia, one of the Gre ...

, in the upper reaches of the Anabar, Olenyok and

Kotuy The Kotuy () is a river in Krasnoyarsk Krai, Russia. It is one of the two rivers that form the Khatanga; the other one being the Kheta. The Kotuy is long, and the area of its basin is . It freezes up in late September or early October and brea ...

rivers.The Archean Litosphere as seen in the Anabar Shield
/ref>

References

External links

The crust-mantle evolution of the Anabar tectonic province in the Siberian Craton: Coupled or decoupled?
{{Coord, 70, 30, N, 108, 0, E, source:ruwiki_region:RU_type:geology, format=dms, display=title Geology of Krasnoyarsk Krai Geology of the Sakha Republic Proterozoic Archean

See also

References

External links