Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China

Hiroshi Yamamoto, Masaru Terabayashi, Hyugo Okura, Takashi Matsui, Yoshiyuki Kaneko, Masahiro Ishikawa, Shigenori Maruyama

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The Dabie orogenic belt in central China extends along the Triassic suture between the Sino-Korean and Yangtze cratons. The structure of the metamorphic rocks have been investigated in the Shima-Wumiao area near the southeastern end of the Dabie orogenic belt. Detailed mapping revealed that the metamorphic sequence in this area can be subdivided into four subhorizontal lithotectonic units. These units are denoted by I, II, III, and IV in the order of structural bottom to top. Unit I is composed of felsic gneiss, eclogite, and minor pelitic gneiss. Unit II consists of felsic gneiss and eclogite with coesite pseudomorphs. Unit III consists of felsic gneiss, pelitic gneiss, metacarbonate, and eclogite with occasional coesite inclusion. Unit IV is composed of felsic gneiss, amphibolite, and minor pelitic gneiss. Those metamorphic rocks underwent penetrative ductile deformation which is denoted by gently south-dipping or subhorizontal foliation and NNW-trending mineral lineation. Deformation microstructures in oriented samples from Units I and II indicate consistent northward displacements of the hanging wall and those from Units III and IV indicate southward displacements. The subhorizontal structure and opposite shear directions between Units I-II and Units III-IV suggest northward extrusion of UHP metamophic units (II and III). The subduction polarity could be opposite to the extrusion trend. The UHP metamorphism in the Dabie orogenic belt is attributable to southward subduction of the Sino-Korean craton beneath the Yangtze craton.

Original languageEnglish
Pages (from-to)51-62
Number of pages12
JournalIsland Arc
Volume22
Issue number1
DOIs
Publication statusPublished - Mar 2013
Externally publishedYes

Fingerprint

extrusion
gneiss
eclogite
orogenic belt
craton
coesite
metamorphic rock
subduction
ductile deformation
hanging wall
lineation
amphibolite
foliation
microstructure
metamorphism
Triassic
mineral

Keywords

  • Dabie
  • Exhumation
  • Shear sense
  • Structure
  • Ultrahigh-pressure

ASJC Scopus subject areas

  • Geology

Cite this

Yamamoto, H., Terabayashi, M., Okura, H., Matsui, T., Kaneko, Y., Ishikawa, M., & Maruyama, S. (2013). Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China. Island Arc, 22(1), 51-62. https://doi.org/10.1111/iar.12004

Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China. / Yamamoto, Hiroshi; Terabayashi, Masaru; Okura, Hyugo; Matsui, Takashi; Kaneko, Yoshiyuki; Ishikawa, Masahiro; Maruyama, Shigenori.

In: Island Arc, Vol. 22, No. 1, 03.2013, p. 51-62.

Research output: Contribution to journalArticle

Yamamoto, H, Terabayashi, M, Okura, H, Matsui, T, Kaneko, Y, Ishikawa, M & Maruyama, S 2013, 'Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China', Island Arc, vol. 22, no. 1, pp. 51-62. https://doi.org/10.1111/iar.12004
Yamamoto, Hiroshi ; Terabayashi, Masaru ; Okura, Hyugo ; Matsui, Takashi ; Kaneko, Yoshiyuki ; Ishikawa, Masahiro ; Maruyama, Shigenori. / Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt, east-central China. In: Island Arc. 2013 ; Vol. 22, No. 1. pp. 51-62.
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