Premium
Tectonics of the Dabieshan (eastern China) and possible exhumation mechanism of ultra high‐pressure rocks
Author(s) -
Faure M.,
Lin W.,
Shu L.,
Sun Y.,
Schärer U.
Publication year - 1999
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.1999.00257.x
Subject(s) - geology , lineation , metamorphism , greenschist , gneiss , geochemistry , metamorphic facies , shear zone , tectonics , proterozoic , petrology , metamorphic rock , paleontology , facies , structural basin
The Dabieshan is divided into three tectonic domains. The Southern Dabieshan is a stack of allochtons, from top to bottom: (i) unmetamorphosed Cambrian–Early Triassic series unconformably covered by Jurassic sandstone; (ii) weakly metamorphosed Proterozoic slate; (iii) HP rocks mostly retrogressed into greenschist facies; (iv) UHP allochton; (v) UHP‐free gneisses. These units exhibit a NW–SE lineation and top‐to‐the‐NW shearing reworked by S‐verging folds. The Central Dabieshan is a migmatitic dome superimposed on UHP metamorphism and bounded by a detachement fault responsible for the exhumation of the UHP unit during its retrogression into amphibolite facies. In the Northern Dabieshan, early foliation and N–S trending compressional lineation are deformed by N‐verging folds coeval to the syn‐exhumation ductile structures of the Central Dabieshan. A geodynamic model involving coeval thrusting and normal faulting is discussed.