|
Geology Of Russia
The geology of Russia, the world's largest country, which extends over much of northern Eurasia, consists of several stable cratons and sedimentary platforms bounded by orogenic (mountain) belts. European Russia is on the East European craton, at the heart of which is a complex of igneous and metamorphic rocks dating back to the Precambrian. The craton is bounded on the east by the long tract of compressed and highly deformed rock that constitutes the Ural orogen. In Asiatic Russia, the area between the Ural Mountains and the Yenisei River is the young West Siberian Plain. East of the Yenisei River is the ancient Central Siberian Plateau, extending to the Lena River. East of the Lena River there is the Verhoyansk-Chukotka collision zone, stretching to the Chukchi Peninsula. The orogens within Russia belong to the Baltic Shield, the Timanides, the Urals, the Altai Mountains, the Ural-Mongolian epipaleozoic orogen and the northwestern part of the Pacific orogeny. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Siberian Plateau
The Central Siberian Plateau (; ) is a vast mountainous area in Siberia, one of the Great Russian Regions. Geography The plateau occupies a great part of central Siberia between the Yenisei and Lena rivers. It is located in the Siberian Platform and extends over an area of , between the Yenisei in the west and the Central Yakutian Lowland in the east. To the south it is bound by the Altai Mountains, Salair Ridge, Kuznetsk Alatau, the Eastern and Western Sayan Mountains and other mountains of Tuva, as well as the North Baikal Highlands and Baikal Mountains. To the north of the plateau lie the North Siberian Lowland and to the east the plateau gives way to the Central Yakutian Lowland and the Lena Plateau.Среднесибирское плоскогорье (Central Siberian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1000000000 (number)
1,000,000,000 (one billion, long and short scale, short scale; one thousand million or one milliard, one yard, Long and short scales, long scale) is the natural number following 100,000,000#900,000,000 to 999,999,999, 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn. In standard form, it is written as 1 × 109. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is Giga-, G. One billion years may be called an ''aeon, eon'' in astronomy or geology. Previously in British English (but not in Comparison of American and British English#Numbers, American English), the word "billion" referred exclusively to a Trillion, million millions (1,000,000,000,000). However, this is not common anymore, and the word has been used to mean one thousand million (1,000,000,000) for several decades. The term ''milliard'' could also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English, variations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magmatic Rock
Igneous rock ( ), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of the top of the Earth's crust by volume. Igneous rocks f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crust (geology)
In geology, the crust is the outermost solid shell of a planet, dwarf planet, or natural satellite. It is usually distinguished from the underlying mantle by its chemical makeup; however, in the case of icy satellites, it may be defined based on its phase (solid crust vs. liquid mantle). The crusts of Earth, Mercury, Venus, Mars, Io, the Moon and other planetary bodies formed via igneous processes and were later modified by erosion, impact cratering, volcanism, and sedimentation. Most terrestrial planets have fairly uniform crusts. Earth, however, has two distinct types: continental crust and oceanic crust. These two types have different chemical compositions and physical properties and were formed by different geological processes. Types of crust Planetary geologists divide crust into three categories based on how and when it formed. Primary crust / primordial crust This is a planet's "original" crust. It forms from solidification of a magma ocean. Toward the end o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proterozoic
The Proterozoic ( ) is the third of the four geologic eons of Earth's history, spanning the time interval from 2500 to 538.8 Mya, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozoic, and is the most recent part of the Precambrian "supereon". The Proterozoic is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic and Neoproterozoic. It covers the time from the appearance of free oxygen in Earth's atmosphere to just before the proliferation of complex life on the Earth during the Cambrian Explosion. The name ''Proterozoic'' combines two words of Greek origin: meaning "former, earlier", and , meaning "of life". Well-identified events of this eon were the transition to an oxygenated atmosphere during the Paleoproterozoic; the evolution of eukaryotes via symbiogenesis; several global glaciations, which produced the 300 million years-long Huronian glaciation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riphean Stage .
The Riphean has been divided by geologists into the Early Riph ...
The Riphean is a stage or age of the geologic timescale from . The name Riphean is used in the Proterozoic stratigraphy of Russia and the Fennoscandian Shield in Finland. It was also used in a number of older international geologic timescales but, in the most recent timescales of the ICS, it is replaced by the Calymmian, Ectasian, Stenian, Tonian and Cryogenian periods of the Neoproterozoic and Mesoproterozoic eras. During the Riphean, there was a great increase in stromatolite diversity, possibly related to the appearance of eukaryotes. The word 'Riphean' comes from the ancient name "Riphean Mountains", sometimes identified with the Ural Mountains The Ural Mountains ( ),; , ; , or simply the Urals, are a mountain range in Eurasia that runs north–south mostly through Russia, from the coast of the Arctic Ocean to the river Ural (river), Ural and northwestern Kazakhstan. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metasediment
In geology, metasedimentary rock is a type of metamorphic rock. Such a rock was first formed through the deposition and solidification of sediment Sediment is a solid material that is transported to a new location where it is deposited. It occurs naturally and, through the processes of weathering and erosion, is broken down and subsequently sediment transport, transported by the action of .... Then, the rock was buried underneath subsequent rock and was subjected to high pressures and temperatures, causing the rock to recrystallize. The overall composition of a metasedimentary rock can be used to identify the original sedimentary rock, even where they have been subject to high-grade metamorphism and intense deformation. Types of metasedimentary rocks See also * References Metamorphic petrology {{Rock-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caucasus Mountains
The Caucasus Mountains * * Azerbaijani: , * * * * * * * * * * * is a mountain range at the intersection of Asia and Europe. Stretching between the Black Sea and the Caspian Sea, they are surrounded by the Caucasus region and are home to Mount Elbrus, the highest peak in Europe at above sea level. The Caucasus Mountains include the Greater Caucasus in the north and the Lesser Caucasus in the south. The Greater Caucasus runs west-northwest to east-southeast, from the Western Caucasus on the northeastern shore of the Black Sea to close to Baku on the Caspian Sea, in Azerbaijan. The Lesser Caucasus runs parallel to the Greater about south. The Greater and Lesser Caucasus ranges are connected by the Likhi Range, and to the west and east of the Likhi Range lie the Colchis Plain and the Kur-Araz Lowland respectively. The Meskheti Range is a part of the Lesser Caucasus system. In the southeast, the Aras River separates the Lesser Caucasus from the Tal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleozoic
The Paleozoic ( , , ; or Palaeozoic) Era is the first of three Era (geology), geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era. The Paleozoic is subdivided into six period (geology), geologic periods (from oldest to youngest), Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Some geological timescales divide the Paleozoic informally into early and late sub-eras: the Early Paleozoic consisting of the Cambrian, Ordovician and Silurian; the Late Paleozoic consisting of the Devonian, Carboniferous and Permian. The name ''Paleozoic'' was first used by Adam Sedgwick (1785–1873) in 1838 to describe the Cambrian and Ordovician periods. It was redefined by John Phillips (geologist), John Phillips (1800–1874) in 1840 to cover the Cambrian to Permian periods. It is derived from the Ancient Greek, Greek ''palaiós'' (π� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Altai Mountains
The Altai Mountains (), also spelled Altay Mountains, are a mountain range in Central Asia, Central and East Asia, where Russia, China, Mongolia, and Kazakhstan converge, and where the rivers Irtysh and Ob River, Ob have their headwaters. The massif merges with the Sayan Mountains in the northeast, and gradually becomes lower in the southeast, where it merges into the high plateau of the Gobi Desert. It spans from about 45° to 52° N and from about 84° to 99° E. The region is inhabited by a sparse but ethnically diverse population, including Russian people, Russians, Kazakh people, Kazakhs, Altai people, Altais, Tuvan people, Tuvans, Mongol people, Mongols, and Volga Germans, though predominantly represented by indigenous ethnic minorities of semi-nomadic people. The local economy is based on bovine, sheep, horse animal husbandry, husbandry, hunting, agriculture, forestry, and mining. The proposed Altaic languages, Altaic language family takes its name from this mountain ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timanide Orogen
The Timanide Orogen (, literally: "Protouralian–Timanide Orogen") is a pre-Uralian orogen that formed in northeastern Baltica during the Neoproterozoic in the Timanide orogeny. The orogen is about 3000 km long. Its extreme points include the southern Urals in the south and the Polar Urals, the Kanin and Varanger peninsulas in the north. The Timan Ridge is the type area of the orogen. To the west, at the Varanger Peninsula, the north-west oriented Timanide Orogen is truncated by the younger Scandinavian Caledonide Orogen that has an oblique disposition. The northeastern parts of the orogen are made up of volcanic and sedimentary rocks, granitoids and few ophiolites. In contrast the southwestern part of the orogen is made up mostly of sedimentary rocks. I and A type granitoids and volcanic rocks are common in the orogen. From the Late Neoproterozoic o the Middle Cambrian Middle or The Middle may refer to: * Centre (geometry), the point equally distant from the outer limits ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
