Controls on tectonic accretion versus erosion in subduction zones: Implications for the origin and recycling of the continental crust
Peter D. Clift,Paola Vannucchi +1 more
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In this paper, the mass flux through convergent plate margins is documented to the understanding of petrogenesis in arc settings and to the origin of the continental crust, since subduction zones are the only major routes by which material extracted from the mantle can be returned to great depths within the Earth.Abstract:
[1] Documenting the mass flux through convergent plate margins is important to the understanding of petrogenesis in arc settings and to the origin of the continental crust, since subduction zones are the only major routes by which material extracted from the mantle can be returned to great depths within the Earth. Despite their significance, there has been a tendency to view subduction zones as areas of net crustal growth. Convergent plate margins are divided into those showing long-term landward retreat of the trench and those dominated by accretion of sediments from the subducting plate. Tectonic erosion is favored in regions where convergence rates exceed 6 ± 0.1 cm yr−1 and where the sedimentary cover is 1 km. Large volumes of continental crust are subducted at both erosive and accretionary margins. Average magmatic productivity of arcs must exceed 90 km3 m.y.−1 if the volume of the continental crust is to be maintained. Convergence rate rather than height of the melting column under the arc appears to be the primary control on long-term melt production. Oceanic arcs will not be stable if crustal thicknesses exceed 36 km or trench retreat rates are >6 km m.y.−1. Continental arcs undergoing erosion are major sinks of continental crust. This loss requires that oceanic arcs be accreted to the continental margins if the net volume of crust is to be maintained.read more
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The global range of subduction zone thermal models
TL;DR: In this article, a suite of thermal models for the global subduction system is presented, where the authors model 56 segments of subduction zones using kinematically defined slabs based on updated geometries from Syracuse and Abers (2006).
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Subduction factory: 4. Depth-dependent flux of H2O from subducting slabs worldwide
TL;DR: In this article, a global compilation of the thermal structure of subduction zones is used to predict the metamorphic facies and H 2 O content of downgoing slabs.
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Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt
Alfred Kröner,Victor Kovach,Elena Belousova,Ernst Hegner,Robin Armstrong,Alla Dolgopolova,Reimar Seltmann,D. V. Alexeiev,J.E. Hoffmann,Jean Wong,Min Sun,Keda Cai,Tao Wang,Y. Tong,Simon A. Wilde,Kirill E. Degtyarev,E. Rytsk +16 more
TL;DR: In this article, the authors argue that the production of mantle-derived or juvenile continental crust during the accretionary history of the Central Asian Orogenic Belt (CAOB) has been grossly overestimated.
Journal ArticleDOI
The generation and evolution of the continental crust
Chris J. Hawkesworth,Chris J. Hawkesworth,Bruno Dhuime,Anna Pietranik,Peter A. Cawood,Anthony I.S. Kemp,Craig Storey,Craig Storey +7 more
TL;DR: The continental crust is the archive of the geological history of the Earth and only 7% of the crust is older than 2.5 Ga, and yet significantly more crust was generated before than subsequently.
Journal ArticleDOI
Greater India Basin hypothesis and a two-stage Cenozoic collision between India and Asia
Douwe J.J. van Hinsbergen,Peter C. Lippert,Guillaume Dupont-Nivet,Nadine McQuarrie,Pavel V. Doubrovine,Wim Spakman,Trond H. Torsvik +6 more
TL;DR: It is suggested that the approximately 50 Ma “India”–Asia collision was a collision of a Tibetan-Himalayan microcontinent with Asia, followed by subduction of the largely oceanic Greater India Basin along a subduction zone at the location of the Greater Himalaya.
References
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Journal ArticleDOI
Chronology of fluctuating sea levels since the triassic.
TL;DR: An effort has been made to develop a realistic and accurate time scale and widely applicablechronostratigraphy and to integrate depositional sequences documented in public domain outcrop sections from various basins with this chronostratigraphic framework.
Journal ArticleDOI
Current plate motions
TL;DR: A global plate motion model, named NUVEL-1, which describes current plate motions between 12 rigid plates is described, with special attention given to the method, data, and assumptions used as discussed by the authors.
Current plate motions
TL;DR: In this paper, a new global model (NUVEL-1) was proposed to describe the geologically current motion between 12 assumed-rigid plates by inverting plate motion data.
Journal ArticleDOI
Nature and composition of the continental crust: A lower crustal perspective
TL;DR: In this article, a three-layer crust consisting of upper, middle, and lower crust is divided into type sections associated with different tectonic provinces, in which P wave velocities increase progressively with depth and there is a large variation in average P wave velocity of the lower crust between different type sections.
Journal ArticleDOI
Seismic velocity structure and composition of the continental crust: A global view
TL;DR: In this paper, the authors presented the structure of the continental crust based on the results of seismic refraction profiles and infer crustal composition as a function of depth by comparing these results with high pressure laboratory measurements of seismic velocity for a wide range of rocks that are commonly found in the crust.
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