The Hulan Group

Its role in the evolution of the Central Asian Orogenic Belt of NE China

Fu Yuan Wu*, Guo Chun Zhao, De You Sun, Simon A. Wilde, Jin Hui Yang

*Corresponding author for this work

Research output: Contribution to journalArticle

356 Citations (Scopus)

Abstract

The Hulan Group of central Jilin Province, northeastern (NE) China, consists of felsic volcanic and sedimentary rocks that underwent sub-greenschist to amphibolite facies metamorphism and multiple phases of deformation during formation of the Central Asian Orogenic Belt. Young Nd model ages of ∼1100 Ma obtained in this study do not support earlier models that the Hulan Group was either rifted from the North China Craton to the south or from the Jiamusi Block to the north, since both these blocks have much older Nd model ages. Detrital zircon U-Pb ages from a meta-sedimentary rock of the Hulan Group define a maximum age of deposition of 287 ± 6 Ma, not Early Palaeozoic as previously believed. Rb-Sr mineral isochron data indicate that metamorphism of the Hulan Group occurred at ∼250 Ma. This conclusion is further supported by an age of 248 ± 4 Ma for the Dayushan granite, which intruded the Hulan Group. These new isotopic data, together with evaluation of the regional geology, indicate that final oceanic closure in the Chinese segment of the Central Asian Orogenic Belt took place in the Late Permian. The Hulan area is located along the Solonker-Xra Moron-Changchun suture that extends from Inner Mongolia across to central Jilin Province. It is this zone that marks the final ocean closure, resulting in the amalgamation of the North China and Siberian cratons.

Original languageEnglish
Pages (from-to)542-556
Number of pages15
JournalJournal of Asian Earth Sciences
Volume30
Issue number3-4
DOIs
Publication statusPublished - 15 May 2007
Externally publishedYes

Keywords

  • Central Asian Orogenic Belt
  • Hulan Group
  • North China Craton

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