Central Asian Orogenic Belt
Phanerozoic accretionary orogen / From Wikipedia, the free encyclopedia
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The Central Asian Orogenic Belt (CAOB), also called the Altaids,[1][2] is one of the world's largest Phanerozoic accretionary orogens,[1][3] and thus a leading laboratory of geologically recent crustal growth.[4] The orogenic belt is bounded by the East European Craton and the North China Craton[1] in the Northwest-Southeast direction, as well as Siberia Craton and Tarim Craton in the Northeast-Southwest direction.[1] It formed by ocean closures during Neoproterozoic to the late Phanerozoic time,[5] from around 750 to 150 Ma.[2] Like many other accretionary orogenic belts, the Central Asian Orogenic Belt consists of a huge amount of magmatic arcs, arc-related basins, accretionary complexes, seamounts, continental fragments and ophiolites.[1][3] It is also considered a relatively distinctive collisional orogenic belt because widespread subduction-accretion complexes and arc magmatic rocks can be found in the region, but collision-related foreland basins are not common.[1]
The formation history of the Central Asian Orogenic Belt is complex and highly disputed among academic scientists. Currently, there are two major evolutionary hypotheses that could potentially explain the geological history of the Central Asian Orogenic Belt.[3] One of the hypothesis stated by geologist Celal Sengor proposed that the Central Asian Orogenic Belt formed due to the accretion of multiple oceanic arcs and continental crusts, while another hypothesis proposed that it was produced by accumulating subduction-accretion complexes on a magmatic arc.[3]
The Central Asian Orogenic Belt is now one of the most researched orogenic belts in the world due to its high significance in researching continental accretion and ore formation.[1] It contains plentiful natural resources, including mineral ores, oil and gas. These rich mineral resources explain why the Central Asian Orogenic Belt is also called the Central Asian metallogenic domain, which is one of the largest metallogenic domains in the world.[1]