Granite subduction: Arc subduction, tectonic erosion and sediment subduction

Continental growth has been episodic, reflecting the episodic nature of mantle dynamics as well as surface dynamics of the Earth, the net result of which is exhibited by the present mantle with two huge reservoirs of TTG rocks, one on the surface continents and the other on the D″ layer on the Core-...

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Bibliographic Details
Published in:Gondwana research 2009-06, Vol.15 (3), p.443-453
Main Authors: Yamamoto, Shinji, Senshu, Hiroki, Rino, Shuji, Omori, Soichi, Maruyama, Shigenori
Format: Article
Language:English
Subjects:
Continental growth
Intra-oceanic arc
Subduction
Western Pacific region
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Summary:Continental growth has been episodic, reflecting the episodic nature of mantle dynamics as well as surface dynamics of the Earth, the net result of which is exhibited by the present mantle with two huge reservoirs of TTG rocks, one on the surface continents and the other on the D″ layer on the Core-Mantle Boundary (CMB). During the early half of the Earth history, the felsic continental crust on the surface which formed in an intra-oceanic environment has mostly been subducted into the deep mantle, except in the rare case of parallel arc collision. The growth history of continental crust shows that with its simultaneous formation, a considerable amount must have also been subducted. Such ongoing subduction processes can be seen in the western Pacific region, through tectonic erosion, arc subduction, and sediment-trapped subduction.
ISSN:1342-937X
1878-0571
DOI:10.1016/j.gr.2008.12.009