page_title: Siberia
section_title: Geology
hierarchical_section_title: Siberia / Geography / Geology
caption_attribution_description: Altay mountains (Belukha), photo by Vít Hněvkovský, 2006 Pohoří Altaj (hora Bělucha)
context_page_description: Siberia is an extensive geographical region spanning much of Eurasia and Northern Asia. Siberia has been part of modern Russia since the latter half of the 16th century.
  The territory of Siberia extends eastwards from the Ural Mountains to the watershed
  between the Pacific and Arctic drainage basins. The river Yenisey conditionally divides Siberia into two parts, Western and Eastern. Siberia stretches southwards from the Arctic Ocean to the hills of north-central Kazakhstan and to the national borders of Mongolia and China.
  With an area of 13.1 million square kilometres, Siberia accounts for 77% of Russia's land area, but it is home to only 23% of the country's population. This is equivalent to an average population density of about 3 inhabitants per square kilometre, making Siberia one of the most sparsely populated regions on Earth. If it were a country by itself, it would still be the largest country by area, but in population it would be the world's 35th-largest and Asia's 14th-largest.
context_section_description: The West Siberian Plain consists mostly of Cenozoic alluvial deposits and is somewhat flat. Many deposits on this plain result from ice dams which produced a large glacial lake. This mid- to late-Pleistocene lake blocked the northward flow of the Ob and Yenisey rivers, resulting in a redirection southwest into the Caspian and Aral seas via the Turgai Valley. The area is very swampy, and soils are mostly peaty histosols and, in the treeless northern part, histels. In the south of the plain, where permafrost is largely absent, rich grasslands that are an extension of the Kazakh Steppe formed the original vegetation, most of which is no longer visible.
  The Central Siberian Plateau is an ancient craton (sometimes named Angaraland) that formed an independent continent before the Permian (see the Siberian continent). It is exceptionally rich in minerals, containing large deposits of gold, diamonds, and ores of manganese, lead, zinc, nickel, cobalt, and molybdenum. Much of the area includes the Siberian Traps—a large igneous province. This massive eruptive period was approximately coincident with the Permian–Triassic extinction event. The volcanic event is said to be the largest known volcanic eruption in Earth's history. Only the extreme northwest was glaciated during the Quaternary, but almost all is under exceptionally deep permafrost, and the only tree that can thrive, despite the warm summers, is the deciduous Siberian Larch (Larix sibirica) with its very shallow roots. Outside the extreme northwest, the taiga is dominant, covering a significant fraction of the entirety of Siberia. Soils here are mainly turbels, giving way to spodosols where the active layer becomes thicker and the ice content lower.
  The Lena-Tunguska petroleum province includes the Central Siberian platform (some authors refer to it as the Eastern Siberian platform), bounded on the northeast and east by the Late Carboniferous through Jurassic Verkhoyansk foldbelt, on the northwest by the Paleozoic Taymr foldbelt, and on the southeast, south and southwest by the Middle Silurian to Middle Devonian Baykalian foldbelt. A regional geologic reconnaissance study begun in 1932, followed by surface and subsurface mapping, revealed the Markova-Angara Arch (anticline). This led to the discovery of the Markovo Oil Field in 1962 with the Markovo—1 well, which produced from the Early Cambrian Osa Horizon bar-sandstone at a depth of 2,156 metres (7,073 ft). The Sredne-Botuobin Gas Field was discovered in 1970, producing from the Osa and the Proterozoic Parfenovo Horizon. The Yaraktin Oil Field was discovered in 1971, producing from the Vendian Yaraktin Horizon at depths of up to 1,750 metres (5,740 ft), which lies below Permian to Lower Jurassic basalt traps.
caption: Belukha Mountain
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