Geochronological constraints on 140-85 Ma thermal doming extension in the Dabie orogen, central China

Changhai Xu, Zuyi Zhou, Changqian Ma, Peter W Reiners

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Regional architecture of geochronology and differential cooling pattern show that the Dabie orogen underwent a thermal doming extension during 140-85 Ma. This extension resulted in widespread re-melting of the Dabie basement, intense volcanic activities in North Huaiyang and the formation of fault-controlled depressions in the Hefei basin. This thermal doming extension can be further divided into two consecutive evolving stages, i.e. the intensifying stage (140-105 Ma) and the declining stage (105-85 Ma). In the first stage (140-105 Ma), the thermal doming mainly was concentrated in the Dabie block, and to a less degree, in the Hongan block. The thermal doming structure of the Dabie block is configured with Macheng-Yuexi thermal axis, Yuexi/Luotian thermal cores and their downslide flanks. The orientation of thermal axis is dominantly parallel to the strike of orogen, and UHP/HP units together with metamorphic rocks of North Huaiyang constitute the downslide flanks. The Yuexi core differs from the Luotian core in both the intensity and the shaping time. To some extent, the Hongan block can be regarded as part of downslide systems of the Dabie doming structure. The doming process is characterized by thermal-center's migration along the Macheng-Yuexi thermal axis; consequently, it is speculated to be attributed to the convective removal of thickened orogenic root, which is a process characterized by intermittance, migration, large-scale and differentiation. During the declining stage (105-85 Ma), the domeshaped figure still structurally existed in the Dable orogen, but orogenic units cooled remarkably slow and magmatic activities stagnated gradually. Study on the thermal doming of Dabieshan Mountains can thus provide detailed constraints on the major tectonic problems such as the UHP/HP exhumation model, the boundary between North Dabie and South Dabie, and the orogenesis mechanism.

Original languageEnglish (US)
Pages (from-to)801-817
Number of pages17
JournalScience in China, Series D: Earth Sciences
Volume45
Issue number9
DOIs
StatePublished - Sep 2002
Externally publishedYes

Fingerprint

thermal structure
exhumation
geochronology
orogeny
metamorphic rock
melting
cooling
tectonics
mountain
basin
removal

Keywords

  • Cooling pattern
  • Dabie orogen
  • Geochronology
  • Thermal doming extension

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Geochronological constraints on 140-85 Ma thermal doming extension in the Dabie orogen, central China. / Xu, Changhai; Zhou, Zuyi; Ma, Changqian; Reiners, Peter W.

In: Science in China, Series D: Earth Sciences, Vol. 45, No. 9, 09.2002, p. 801-817.

Research output: Contribution to journalArticle

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