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Subduction Erosion at Pacific-Type Convergent Margins

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Abstract

The paper presents a review of processes of subduction or tectonic erosion at Pacific-type convergent margins (PTCM) including definition of “tectonic erosion”, its triggers, driving forces and consequences. We review examples of tectonic erosion at the Circum-Pacific PTCMs and at the fossil PTCMs of the Paleo-Asian Ocean (PAO) currently hosted by the Central-Asian Orogenic Belt (CAOB). Recent geological and stratigraphic studies have shown two types of PTCMs: accreting and eroding. Accreting PTCMs consist of older deposits of accretionary and frontal prisms and grow oceanward, i.e. the trench retreats. Eroding PTCMs are characterized by the destruction of the prism, approaching arc and trench and typically form during shallow-angle and fast subduction of an oceanic slab with oceanic floor relief highs. The mechanism of tectonic erosion includes destruction of oceanic slab, island arcs, accretionary prism, fore-arc and related prism. Tectonic erosion is a common phenomenon at many Circum-Pacific PTCMs, e.g., in South America, Tonga and Nankai troughs, Alaska. Accretion and subduction of oceanic rises contributes greatly to the processes of formation, transformation and destruction of continental crust at PTCM. The episodes of tectonic erosion can be also reconstructed for an ancient ocean, for example, for the PAO, which evolution and suturing formed the CAOB. Many CAOB foldbelts (Altai, Tienshan, eastern Kazakhstan, Transbaikalia, Mongolia) carry signs of disappearance of big volumes of continental crust (arcs). Studying processes responsible not only for the formation of continental crust, but also for the disappearance of big volumes of crustal material is important for correct evaluation of the nature of intra-continental orogenic belts, e.g., CAOB, and development of reliable tectonic models.

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ACKNOWLEDGMENTS

The study was supported by the Russian Science Foundation (project # 21-77-20022, review of tectonic models, preparation of the publication). Additional support came from the State Assignment of IGM SB RAS from Ministry of Science and Education of Russia (earlier data from the CAOB).

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  1. Novosibirsk State University, 630090, Novosibirsk, Russia

    I. Yu. Safonova

  2. Sobolev Institute of Geology and Mineralogy, SB RAS, 630090, Novosibirsk, Russia

    I. Yu. Safonova

  3. Far-East Geological Institute, FEB RAS, 690022, Vladivostok, Russia

    A. I. Khanchuk

  4. Geological Institute RAS, 119017, Moscow, Russia

    A. I. Khanchuk

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Safonova, I.Y., Khanchuk, A.I. Subduction Erosion at Pacific-Type Convergent Margins. Russ. J. of Pac. Geol. 15, 495–509 (2021). https://doi.org/10.1134/S1819714021060087

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