High- to ultrahigh-pressure (UHP) ductile shear zones in the Sulu UHP metamorphic belt, China; implications for continental subduction and exhumation

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doi: 10.1046/j.1365-3121.2003.00500.x
Authors:Zhao, Z. Y.; Fang, A. M.; Yu, L. J.
Author Affiliations:Primary:
Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Volume Title:Terra Nova
Source:Terra Nova, 15(5), p.322-329. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Publication Date:2003
Note:In English. 52 refs.; illus., incl. geol. sketch maps
Summary:High- to ultrahigh-P (HP-UHP) metamorphic rocks that resulted from deep continental subduction and subsequent exhumation in the Sulu orogenic belt, China, have experienced multiphase deformation and metamorphic overprint during its long journey to the mantle and return to the surface. HP-UHP shear zones are strain-localized weak zones on which the UHP slab is transported over long distances. HP-UHP shear zones are well exposed along a 200-km belt in the Sulu UHP metamorphic belt. The shear zones lie structurally below the UHP rocks and above the non-UHP rocks, suggesting the early exhumation of the UHP rocks by thrusting. The large area distribution, of HP-UHP nature, high strain and structural association of the shear zones with the UHP rocks suggest that the shear zones are probably a regional detachment developed during the early stage of exhumation of the UHP rocks. Kinematic indicators suggest top-to-the N-NW motion of the UHP slab during the exhumation, which, combined with isotope signatures in Mesozoic igneous rocks, leads to the interpretation that the subduction polarity is from the N China plate down to the S rather than the Yangtze plate down to the N in the Sulu region. [G.L.B.]
Subsections:Metamorphism: regional, dynamic
Subjects:Deformation; Ductile deformation; Exhumation; Faults; Kinematics; Metamorphic rocks; Plate collision; Plate tectonics; Pressure; Shear zones; Subduction; Ultrahigh pressure; Asia; China; Dabie Mountains; Far East; Qinling Mountains; Sulu Terrane
Coordinates:N352000 N353000 E1194000 E1193000
Abstract Numbers:04M/45
Record ID:2004033477
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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