40Ar/39Ar geochronological constraints on syn-orogenic strike-slip movement of Tan-Lu fault zone

Guang Zhu, Guosheng Liu, W. J. Dunlap, C. Teyssier, Yongsheng Wang, Manlan Niu

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Two phases of sinistral strike-slip ductile shear belts occur on the eastern margin of the Dabic orogenic belt. A muscovite 40Ar/ 39Ar plateau age of 128 Ma was obtained from mylonite in the later ductile shear zone. Three muscovite samples separated from mylonites of 3 localities in the earlier ductile shear belts yield 40Ar/ 39Ar plateau ages of 192.5±0.7 Ma, 189.7±0.6 Ma and 188.7±0.7 Ma, respectively. They are interpreted as cooling ages of the earlier sinistral strike-slip deformation. It is suggested that left-lateral displacement of the Tan-Lu fault zone started in a late stage of the collision orogeny in the Dabie-Sulu orogenic belt between the North and South China plates. Therefore, the earlier Tan-Lu fault zone was syn-orogenic strike-slip tectonics. The fault zone was used again for sinistral displacement during tectonic activities of peri-Pacific regime in Early Cretaceous. It is proposed that the fault zone occurred as a transform fault during the orogenic process.

Original languageEnglish (US)
Pages (from-to)499-508
Number of pages10
JournalChinese Science Bulletin
Volume49
Issue number5
DOIs
StatePublished - 2004

Keywords

  • Dabie-Sulu orogenic belt
  • Muscovite Ar/Ar age
  • Mylonite
  • Syn-orogenic strike-slip movement
  • Tan-Lu fault zone

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