Cenozoic Tectonics of Asia: Effects of a Continental Collision: Features of recent continental tectonics in Asia can be interpreted as results of the India-Eurasia collision
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Stable URL:http://links.jstor.org/sici?sici=0036-8075%2819750808%293%3A189%3A4201%3C419%3ACTOAEO%3E2.0.CO%3B2-NScience is currently published by American Association for the Advancement of Science.Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available athttp://www.jstor.org/about/terms.html. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtainedprior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content inthe JSTOR archive only for your personal, non-commercial use.Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained athttp://www.jstor.org/journals/aaas.html.Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printedpage of such transmission.The JSTOR Archive is a trusted digital repository providing for long-term preservation and access to leading academicjournals and scholarly literature from around the world. The Archive is supported by libraries, scholarly societies, publishers,and foundations. It is an initiative of JSTOR, a not-for-profit organization with a mission to help the scholarly community takeadvantage of advances in technology. For more information regarding JSTOR, please contact support@jstor.org.http://www.jstor.orgFri Jan 25 16:37:09 2008Keywords:
continental collision
Collision zone
Continental Margin
Stable URL:http://links.jstor.org/sici?sici=0036-8075%2819750808%293%3A189%3A4201%3C419%3ACTOAEO%3E2.0.CO%3B2-NScience is currently published by American Association for the Advancement of Science.Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available athttp://www.jstor.org/about/terms.html. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtainedprior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content inthe JSTOR archive only for your personal, non-commercial use.Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained athttp://www.jstor.org/journals/aaas.html.Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printedpage of such transmission.The JSTOR Archive is a trusted digital repository providing for long-term preservation and access to leading academicjournals and scholarly literature from around the world. The Archive is supported by libraries, scholarly societies, publishers,and foundations. It is an initiative of JSTOR, a not-for-profit organization with a mission to help the scholarly community takeadvantage of advances in technology. For more information regarding JSTOR, please contact support@jstor.org.http://www.jstor.orgFri Jan 25 16:37:09 2008
continental collision
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SUMMARY During the Cambrian, two types of continental margins occurred around Gondwana. The eastern margin (Antarctica, Australia and southern South America) was characterized by a narrow continental shelf with a steep slope separating the shallow water environment from a deep‐oceanic one accompanied by mafidultramafic volcanics. The western margin was characterized by a wider continental shelf, probably passing gradually to an unknown outer basin. This comprised three main domains: the Asiatic shelf, composed of distinct cratonic blocks, presumably separated from each other by deeper‐water/ volcanic intracontinental basins; the European shelf, characterized by the development of shallow intracontinental siliciclastic basins; and the Americanc‐African shelf, morphologically and depositionally uniform. The distinction of these two Gondwana continental margins expresses their different geodynamic behaviour during Cambrian extensional tectonics. In fact, the sedimentary/palaeogeographic evolution, suggests the establishment of an active Pacific‐like margin in the eastern domain, and the tentative establishment of a divergent Atlantic‐like margin, in the westem one.
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During the past decade many geo-scientific discoveries suggest that continental margins are regions of extensive thrusting. Seismologic data establish that earthquake hypocenters are contained in a tabular volume of rocks that plunges steeply landward below the seaward edges of continents. First-motion studies of these earthquakes indicate a convergence of continental and oceanic crusts. On land, coastal areas of extensive thrust faulting are becoming known. These data support the hypothesis of ocean-floor spreading which requires extensive thrusting of oceanic crust beneath the continents. This hypothesis and the seismologically defined thrust zone imply that profound compressional deformation should take place at the base of continental slopes. Structures produced by compressional forces are not observed in seismic-reflection records of the sediments filling marginal trenches or in sediments tilted against the continental slope during development of the trenches. Continental rises also consist of undeformed strata. Only deformation from subsidence and slumping has been seen at the foot of the continental slope from southern Chile to the outer Aleutian Islands. The observations of little or no thrusting at the juncture of the upper continental and oceanic crusts are now numerous and well established. These data must also be End_Page 747------------------------------ considered in hypotheses that explain the development of continental margins. End_of_Article - Last_Page 748------------
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Progradation
Continental Margin
Abyssal plain
Neogene
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Continental Margin
Red beds
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Continental Margin
Passive margin
Seafloor Spreading
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Based on confirming the geotectonic units in north and analyzing the nature of magmatic arcs and related geotectonic settings, the author thought North was an collision orogen formed by the collision between the Luconia continental block and the north margin of Sundaland. It is called Cenozoic collision orogen of north Kalimantan by the author. This orogen saw a very complicated history from interior orogen to peripheral orogen and to interior orogen again. It is suggested that regional metallogenesis in be controlled by these geological and tectonic processes.The imbricate thrusting stage during late Oligocene-middle Miocene interior orogen was the most important epoch of regional metallogenesis in Kalimantan.
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Continental deep subduction after the closure of large oceanic basins is commonly ascribed to the gravitational pull of the subducting oceanic slab. However, it is not clear how continental lithosphere adjacent to small oceanic basins was subducted to mantle depths. The Sesia Zone in the Western Alps provides an excellent target for exploration of subduction dynamics in such a tectonic setting. Here we report the first finding of coesite in a jadeite-bearing orthogneiss from the Sesia Zone, providing the first evidence for deep subduction of the continental crust to mantle depths for ultrahigh-pressure (UHP) metamorphism in this zone. Three coesite inclusions were identified by laser Raman spectroscopy in two garnet grains. Based on zircon U-Pb dating and trace element analysis, the UHP metamorphic age was constrained to be 76.0 ± 1.0 Ma. The phase equilibrium modeling yields peak metamorphic pressures of 2.8-3.3 GPa, demonstrating the continental deep subduction to mantle depths of >80 km. The subducted continental crust was a rifted hyperextended continental margin, which was converted to the passive continental margin during seafloor spreading and then deeply subducted during the oblique convergence between the Adria microplate and Eurasian plate in the Late Cretaceous. Because the slab pull could only play a limited role in closing small oceanic basins for continental collision, the distal push of either continental breakup or seafloor spreading is suggested as the major driving force for the deep subduction of continental crust in the Western Alps. Therefore, deep subduction of the continental crust bordering small oceanic basins would have been induced by the far-field stress of compression, whereas that bordering large oceanic basins was spontaneous due to the oceanic slab pull. This provides a new insight into the geodynamic mechanism of continental deep subduction.
Continental Margin
Seafloor Spreading
continental collision
Convergent boundary
Eclogitization
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