Top boundary of the Dabie UHPM rocks, central China

Wang Qingchen, Liu Xiaohan, Shigenori Maruyama, Cong Bolin

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The top boundary of the ultra-high pressure metamorphic (UHPM) rocks in the Dabie Mountains, central China, has been mapped. The results show that the top boundary of the UHPM rocks is occupied by flat-lying felsic gneiss, on which tonalitic gneiss rests. Petrological and mineralogical evidence indicates a wide P-T gap across the boundary with an estimated peak metamorphic P-T value of the UHPM rocks being >30 kbar and 800 ± 50°C, and that of the tonalitic gneiss around 11 kbar and 800°C. Their P-T-t paths are different. The former has a clockwise path and the latter is counterclockwise. This implies that the UHPM rocks at the bottom and the tonalitic gneiss on top have been structurally juxtaposed together. The top boundary, i.e. the contact between the UHPM rocks and tonalitic gneiss, shows characteristics of a ductile shear zone. Microscopically, feldspar and quartz in the shear zone are characterized by ductile deformation. In larger scale, the top boundary is undulating. Shear sense in the top boundary is a two-way direction. Only the latest shear sense measured with c-axes of quartz show a consistent direction of top-to-the-north. The study provides some constraints to the exhumation process of the Dabie UHPM rocks.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalJournal of Southeast Asian Earth Sciences
Volume11
Issue number4
DOIs
Publication statusPublished - 1995
Externally publishedYes

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metamorphic rock
gneiss
shear zone
P-T-t path
quartz
ductile deformation
exhumation
feldspar
mountain

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Top boundary of the Dabie UHPM rocks, central China. / Qingchen, Wang; Xiaohan, Liu; Maruyama, Shigenori; Bolin, Cong.

In: Journal of Southeast Asian Earth Sciences, Vol. 11, No. 4, 1995, p. 295-300.

Research output: Contribution to journalArticle

Qingchen, Wang ; Xiaohan, Liu ; Maruyama, Shigenori ; Bolin, Cong. / Top boundary of the Dabie UHPM rocks, central China. In: Journal of Southeast Asian Earth Sciences. 1995 ; Vol. 11, No. 4. pp. 295-300.
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