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Tuesday, December 1, 2020 | History

5 edition of Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir found in the catalog.

Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir

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Published by Geological Society of America in Boulder, Colo .
Written in English

    Places:
  • Pamir Region.
    • Subjects:
    • Geology, Structural -- Pamir Region.,
    • Subduction zones -- Pamir Region.

    • Edition Notes

      Includes bibliographical references (p. 72-76).

      StatementV.S. Burtman and Peter Molnar.
      SeriesSpecial paper ;, 281, Special papers (Geological Society of America) ;, 281.
      ContributionsMolnar, Peter Hale.
      Classifications
      LC ClassificationsQE634.P36 B87 1993
      The Physical Object
      Paginationv, 76 p. :
      Number of Pages76
      ID Numbers
      Open LibraryOL1408813M
      ISBN 100813722810
      LC Control Number93017404

      - Continental mountains (e.g., Cascades, Andes) - Continental volcanic arc Earthquakes - Subducting oceanic plate metamorphosed 2.) Oceanic-oceanic - Deep and shallow earthquakes - Island volcanic arc 3.) Continental-continental - No subduction since two plates are highly buoyant - Builds huge mountain ranges (Ex. Alps, Himalayas) - Volcanoes. responsible for Miocene exhumation, processes related to intra-continental subduction are favored, due largely to support from geophysical data (e.g. Hamburger and others, ; Burtman and Molnar, ; Negredo, ). If this is the case, this process results in high magnitude, regionally-distributed, episodic. The geological record shows that continental‐derived UHP rocks can be formed by subduction of thinned continental‐margin crust beneath ophiolites (e.g., Oman ophiolite, west Himalayan ophiolites) or beneath island arcs (e.g., Kohistan Arc, Pakistan) as well as in continent‐continent collision zones (e.g., Dabie Shan–Sulu Belt. Plate tectonics (from the Late Latin: tectonicus, from the Ancient Greek: τεκτονικός, lit. 'pertaining to building') is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of Earth's lithosphere, since tectonic processes began on Earth between and billion years ago.


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Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir by V. S. Burtman Download PDF EPUB FB2

PDF | On Jan 1,Burtman V.S. and others published Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir.

Geol. Soc. Geological and Geophysical Evidence for Deep Subduction of Continental Crust Beneath the Pamir Geological and geophysical observations imply Cenozoic subduction of intact Eurasian continental lithosphere, approximately km in downdip length and including relatively thin (20–25 km) continental crust, beneath the Pamir.

Geological and geophysical observations imply Cenozoic subduction of intact Eurasian continental lithosphere, approximately km in downdip length and including relatively thin (km).

Buy Geological and Geophysical Evidence for Deep Subduction of Continental Crust Beneath the Pamir (Geological Society of America Special Paper) on FREE SHIPPING on qualified ordersCited by: Geological and Geophysical Evidence for Deep Subduction of Continental Crust Beneath the Pamir.

Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir. (OCoLC) Material Type: Document, Internet resource: Document Type: Book, Computer File, Internet Resource: All Authors / Contributors: V S Burtman; Peter Hale Molnar.

The Pamir is regarded as a possible place of active continental subduction because of the intermediate-depth seismicity, crustal xenoliths and estimates of. During Cenozoic times, the northern margin of the Pamir has indented northward ∼ km, as it was accommodated by south‐dipping intracontinental subduction along the Main Pamir Thrust (MPT) and was coupled to strike‐slip faulting on its western and eastern margins [.

Burtman, V. S., Molnar Peter, Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir, Special Paper, Geological Society of America, 2. P. Burtman, P. MolnarGeological and geophysical evidence for deep subduction of continental crust beneath the Pamir Geological Society of America Special Paper, (), pp.

Google Scholar. Geological and Geophysical Evidence for Deep Subduction of Continental Crust Beneath the Pamir 作者: Burtman, V. S./ Molnar, Peter 出版社: Geological Society of Amer 定价: 5 装. Geological and Geophysical Evidence for Deep Subduction of Continental Crust Beneath the Pamir.

Geological Society of America, Special Paper,1– •Kuchai, V., & Trifonov, V., Young left-lateral strike-slip along the zone of the Darvaz Fault (in Russian). There is also evidence that continental crust is formed through an accretionary process known as relamination. As an oceanic plate subducts underneath a continental plate, it pulls ocean floor sediment, magma, and larger concentrations of rock along with it.

Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir / V.S. Burtman and Peter Molnar. Author Burtman, V. (Valentin Semenovich) [Browse]. Burtman, V.S., and Molnar, P. Geological and geophysical evidence for deep subduction of the continental crust beneath the Pamir.

Special Paper of the Geological Society of America. Crossref, Google Scholar. In fact, if the Pamir intermediate depth seismicity occurs in lithosphere subducted from the north, that lithosphere could have been continental in origin, with subduction initiating in thinned continental crust [Burtman and Molnar, ; Chatelain et al., ].

Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir. Geological Society of America Special Paper Crossref, Google Scholar. Chatelain JL, Roecker SW, Hatzfeld D, Molnar P. Continental crust is the layer of igneous, sedimentary, and metamorphic rocks that forms the geological continents and the areas of shallow seabed close to their shores, known as continental layer is sometimes called sial because its bulk composition is richer in silicates and aluminium minerals and has a lower density compared to the oceanic crust, called sima which is.

The second theory, continental subduction, entails the wholesale underthrusting of the Indian continental crust beneath the Tibetan Plateau and subsequent uplift. This process is reminiscent of taking a block of ice and pushing it beneath another ice slab, causing the latter to rise upwards.

Recent numerical modeling by Dr. Baumgardner has found that repetitive tsunami waves, caused by rapid plate movement, could result in water accumulation more than a kilometer ( miles) deep on the continents, contributing to the flooding.

12 The runaway subduction model also provides a mechanism to lower the continental crust about two miles. Notes Geological Society of America Downloaded from on J Active continental subduction beneath the Betic Cordillera and the Alborán Sea J.

Morales* Instituto Andaluz de Geofísica, Universidad de Granada, Granada, Spain I. Serrano A. Jabaloy Departamento de Geodinámica, Universidad de Granada, Argon, oxygen, and boron isotopic evidence documenting 40 Ar E accumulation in phengite during water-rich high-pressure subduction metasomatism of continental crust Earth and Planetary Science Letters, v.

p. In particular, Roecker () observes low seismic velocities in the upper mantle, from which he concludes partial subduction of the continental crust. Favouring this interpretation, many geological observations provide evidence for the underthrusting of the Eurasian continental lithosphere beneath the Pamir (e.g.

Hamburger et al. Subduction of continental crust—as it is the case in the Pamir—can lead to an accumulation of felsic rocks in the middle and lower crust (Hacker et al. The existence of felsic melts beneath the Southern Pamir is also supported by xenolith studies (Ducea et.

Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir. Geol Soc Am Spec Pap, 1– Elevation of the km discontinuity beneath the central Tien Shan: Evidence for a detached lithospheric root. Deep burial of Asian continental crust beneath the Pamir imaged with local earthquake tomography.

In the western Pacific, earthquakes were occurring at great depths beneath deep-ocean trenches. When the leading edge of a plate capped with continental crust converges with a slab of oceanic lithosphere, the buoyant continental block remains _____, while the dense oceanic slab sinks into the _____.

From a geophysical evidence, we. Burtman V S and Molnar P (). Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir. Geol Soc Am Special. In the western Himalayan syntaxis (WHS), two converging continental subduction zones have been reported to extend to a depth of ~ km, with a south-dipping 10–15 km-thick low-velocity zone proposed as the subducting Eurasian continental lower crust beneath the Pamir and a north-dipping Indian slab beneath the Hindu Kush 5 – 8.

The Pamir is characterized by a thick continental crust of about 70 km (Chen and Molnar, ; Holt and Wallace, ). Geophysical observations show an oblique subduction zone submerges to the SSE (Billington et al., ) beneath the Pamir.

This subduction zone indicate a large Mesozoic thrust fault at the Trans-Alai range. Figure 2. [3] V.

Burtman and P. Molnar, " Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir," Geological Society of America Special Paperpp. 76, [4] Chandra, U.,Focal mechanism solutions and their tectonic implications for the eastern Alpine-Himalayan region, in Gupta, H.K., and Delany, F.

Introduction. Subduction is a uniquely powerful and important Earth process, so it is no surprise that the geoscientific community has become increasingly interested in the process since the term was introduced by White et al.

(; also see the prescient sketch of a subduction zone by Coats, ) on the heels of the plate tectonic revolution. [1] V.S. Burtman and P. Molnar, Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir. GSA Special Paper () p   Petr Jeřábek, Jiří Konopásek and Eliška Žáčková, Two-stage exhumation of subducted Saxothuringian continental crust records underplating in the subduction channel and collisional forced folding (Krkonoše-Jizera Mts., Bohemian Massif), Journal of Structural Geology, /, 89, (), ().

Continental subduction and collision normally follows oceanic subduction, with the remarkable event of formation and exhumation of high-to ultra-high-pressure (HP-UHP) metamorphic rocks. Based on the summary of numerical geodynamic models, six modes of continental convergence have been identified: pure shear thickening, folding and buckling, one-sided steep subduction, flat subduction, two.

This $M project, funded by the Department of Energy, the International Continental Drilling Program, and the US Air Force, had two goals: understanding volcanic and tectonic processes associated with mantle plumes under continental crust, and testing innovative approaches to.

The problem of the origin of the continental crust can be resolved into two fundamental questions: (1) the location and mechanisms of initial mantle extraction of the primitive crust and (2) the processes by which this primitive crust is converted into the continental crust that presently exists.

We know that Archean continental crust is. Geologic data concur with geophysical and isotopic data that suggest the presence of deep crustal fault zones along the Battle Mountain-Eureka (BME) trend and elsewhere in Nevada.

The fault zones may have originated during Proterozoic rifting of the continent and were likely substantially reactivated and modified during Paleozoic tectonism.

ble. Evidence is presented that appears to contradict continental drift, seafloor spreading, and subduction, as well as the claim that the oceanic crust is relatively young.

The problems posed by vertical tectonic movements are reviewed, including evidence for large areas of submerged continental crust in today’s oceans. Ultrahigh-Pressure Metamorphism: Deep Continental Subduction.

Geological Society of America Special Paperpp. Hacker, B.R., Pressures and temperatures of ultrahigh-pressure metamorphism: Implications for UHP tectonics and H2O in subducting slabs. International Geology Review, v.

48, p. Sediment subduction occurs beneath volcanoplutonic arcs around the world and is recognized in the compositions of arc lavas. Continental subduction may be underway beneath the Pamir. Subduction erosion also occurs beneath volcanoplutonic arcs around the world, carrying continental rocks to mantle depths at least locally.

Exhumation of UHP rocks. Findings at the surface of metamorphic rocks that must have arisen from ultra-high pressures deep in the Earth’s mantle also provide evidence for subduction of continental crust in the Pamir region.

Furthermore, the question arises, how the occurrence of numerous earthquakes at unusual depths of down to km in the upper mantel can be.JO Cenozoic development of the southern part of the western United States can serve as an example.

Subduction of oceanic lithosphere beneath the continental margin ofthe western United States began about m.y. ago and has continued. at least locally, to the present.Implications of deep crustal evolution for seismic reflection interpretation / David M.

Fountain --Interpretation of seismic reflection data in complexly deformed terranes: a geologist's perspective / Robert D. Hatcher Jr. --Continental evolution by lithospheric shingling / Frederick A.

Cook --Crustal reflections and crustal structure / Scott.