辽宁丹东地区侏罗纪花岗岩的变形时代

40Ar/39Ar年代学制约

Translated title of the contribution: Deformation age of Jurassic granites in the Dandong area, Eastern China: 40Ar/39Ar geochronological constraints

Jin Hui Yang*, Fu Yuan Wu, Ching Hua Lo, Sun Lin Chung, Yan Bin Zhang, Simon A. Wilde

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Gneissic two-mica monzogranites are widespread in the southern Liaodong Peninsula, eastern China. The SHRIMP zircon U-Pb dating indicates that their emplacement ages are between 180 ∼ 157 Ma. The most remarkable characteristics of these granites are that these granites had experienced two stages of ductile deformation, i. e., the early NW-trending compression and later EW-trending extension. However, the deformation ages are still not constrained. In this paper we present UV laser ablation 40Ar/39Ar data of K-bearing minerals from the Heigou pluton, which is located at the southwestern of Dandong City, to study its deformation age and cooling history. Our results show that the Heigou pluton was deformed at ∼ 143 Ma and ∼ 121 Ma, respectively, during crustal compression and extension and subsequently cooled and exhumated from 121 Ma to 113 Ma. This indicates that the tectonic transition happened during 143 ∼ 113 Ma in the Liaodong Peninsula. Considering the regional tectonics, we present that the NW-trending compression was related to the subduction of Paleo-Pacific Plate beneath the Eurasia continent during Late Jurassic to Early Cretaceous, while the EW-trending extension was the result of the direction and speed transformation of the subduction of Paleo-Pacific Plate, lithospheric thinning and relaxation of compression.

Original languageChinese
Pages (from-to)1205-1214
Number of pages10
JournalActa Petrologica Sinica
Volume20
Issue number5
Publication statusPublished - 2004
Externally publishedYes

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Keywords

  • Ar/Ar geochronology
  • Deformation age
  • Eastern China
  • Jurassic granite
  • Liaodong Peninsula

Cite this

Yang, J. H., Wu, F. Y., Lo, C. H., Chung, S. L., Zhang, Y. B., & Wilde, S. A. (2004). 辽宁丹东地区侏罗纪花岗岩的变形时代: 40Ar/39Ar年代学制约. Acta Petrologica Sinica, 20(5), 1205-1214.