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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Altai Mountains
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Mongolian Altai (1)
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Central Asia (1)
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Far East
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Mongolia
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Mongolian Altai (1)
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Commonwealth of Independent States
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Russian Federation
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elements, isotopes
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metals
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hafnium
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igneous rocks
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Primary terms
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Asia
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metamorphic rocks
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Bayan Tsagaan Uul Massif
Cathodoluminescent images of zircon grains from rocks of the Vendian intrus...
Cathodoluminescent images of zircon grains from rocks of the Vendian intrus...
Vendian Island-Arc Intrusive Magmatism of the Lake Zone of Western Mongolia (Geological, Geochronological, and Petrochemical Data)
Intrusive Complexes of the Late Neoproterozoic Island Arc Structure of the Lake Zone (Mongolia): Isotope Systematics and Sources of Melts
The Ms = 7.0 Uureg Nuur earthquake of 15.05.1970 (Mongolian Altai): the aftershock process and current seismicity in the epicentral area
Schematic geological map of the Lake structural-formational zone of Western...
Geochemistry, Sm–Nd, Rb–Sr, and Lu–Hf Isotopes, Sources, and Conditions of Formation of Early Paleozoic Plagiogranitoids in the South of the Lake Zone in Western Mongolia
Composition and Age of Plagiogranitoids in the South of the Lake Zone (Western Mongolia)
Neoproterozoic to early Paleozoic tectonic evolution of the Zavkhan terrane of Mongolia: Implications for continental growth in the Central Asian orogenic belt
Zircon Ages from the Baydrag Block and the Bayankhongor Ophiolite Zone: Time Constraints on Late Neoproterozoic to Cambrian Subduction- and Accretion-Related Magmatism in Central Mongolia
Structural and topographic characteristics of restraining bend mountain ranges of the Altai, Gobi Altai and easternmost Tien Shan
Abstract Restraining bend mountain ranges are fundamental orogenic elements in the Altai, Gobi Altai and eastern Tien Shan. In this paper, 12 separate restraining bends are reviewed to identify common structural and topographic characteristics. The 12 restraining bends occur in one of three different tectonic settings: (1) strike-slip fault termination zones; (2) at a major strike-slip fault bend where the individual strike-slip fault can be traced continuously from one end of the range to the other; and (3) where two separate strike-slip fault segments converge and overlap. Fault maps of the 12 separate bends reveal that they are all flower or half-flower structures in cross-section, but there is considerable architectural diversity and all have unique individual topographic, structural and dimensional characteristics. Many factors account for the architectural diversity of the restraining bend mountains, especially stepover width, total amounts of strike-slip displacement, reactivation of older structures, tectonic setting, and the angular relation between fault trace and maximum horizontal stress. The stepover sense for regionally important strike-slip faults is controlled by pre-existing basement heterogeneities and is dominantly contractional. Therefore, releasing bends and transtensional basins are largely absent. Throughout the region there is a continuum of mountain range types, from purely contractional ridges to isolated restraining bends along strike-slip-dominated zones. Nucleation, topographic uplift, along- and across-strike growth of the bend, and restraining bend coalescence with adjacent ranges appears to be an important mountain-building process in the Altai, Gobi Altai and eastern Tien Shan; similar processes are likely in other intracontinental transpressional orogens.
INTERESTING PAPERS IN OTHER JOURNALS
The Structure of the Mongol-Okhotsk Fold Belt and the Problem of Recognition of the Amur Microcontinent
Tectonic setting and structural evolution of the Late Cenozoic Gobi Altai orogen
Abstract The Gobi Altai is an intraplate, intracontinental transpressional orogen in southern Mongolia that formed in the Late Cenozoic as a distant response to the Indo-Eurasia collision. The modern range formed within crust constructed by successive terrane accretion and ocean suturing events and widespread granite plutonism throughout the Palaeozoic. Modern reactivation of the Gobi Altai crust and the kinematics of Quaternary faults are fundamentally controlled by Palaeozoic basement structural trends, the location of rigid Precambrian blocks, orientation of SH max and possible thermal weakening of the lower crust as a result of an extensive history of Mesozoic–Cenozoic basaltic volcanism in the region, and the presence of thermally elevated asthenosphere under the Hangay Dome to the north. Modern mountain building processes in the Gobi Altai typically involve reactivation of NW–SE-striking basement structures in thrust mode and development of linking east–west left-lateral strike-slip faults that crosscut basement structures within an overall left-lateral transpressional regime. Restraining bends, other transpressional ridges and thrust basement blocks are the main range type, but are discontinuously distributed and separated by internally drained basins filling with modern alluvial deposits. Unlike a contractional thrust belt, there is no orogenic foreland or hinterland, and thrusts are both NE and SW directed with no evidence for a basal décollement. Normal faults related to widespread Cretaceous rifting in the region appear to be unfavourably oriented for Late Cenozoic reactivation despite widespread topographic inversion of Cretaceous basin sequences. Because the Gobi Altai is an actively developing youthful mountain range in an arid region with low erosion rates, it provides an excellent opportunity to study the way in which a continental interior reactivates as a result a distant continental collision. In addition, it offers important insights into how other more advanced intracontinental transpressional orogens may have developed during earlier stages of their evolution.