杨进辉, 吴福元, 钟孙霖, 罗清华, 2008. 华北东部早白垩世花岗岩侵位的伸展地球动力学背景

激光40Ar/39Ar年代学证据. 岩石学报

Translated title of the contribution: The extensional geodynamic setting of Early Cretaceous granitic intrusions in the Eastern North China Craton: evidence from laser ablation 40Ar/39Ar dating of K-bearing minerals

Jin Hui Yang*, Fu Yuan Wu, Sun Lin Chung, Ching Hua Lo

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Early Cretaceous Gudaoling batholith, distributed in the Liaodong Peninsula, eastern North China Craton, is composed by three types of grantoids, deformed diorite at Miaoling, gnessic granodiorite at Wanjialing, medium-grained monzogranite and enclave at Gudaoling. The diorite and granodiorites have evidently gnessis structures, indicating that they had experienced ductile deformation. The directions of foliations and lineations are accordant with those of host mylonites at the lower plate of a normal fault, suggesting that the Gudaoling batholith is a syn-tectonic intrusion. Laser ablation 40Ar/39Ar dating of K-bearing minerals (hornblende, biotite and K-feldspar) from each type of granitoid and mylonites gives a result that Gudaoling batholith and its host mylonites had experienced a deformation and metamorphism event during Early Cretaceous (120-113 Ma), showing a rapid cooling and exhumation history. This event in the Liaodong Peninsula, as well as east North China Craton are consistent with the timing of formation of pull-apart basins and metamorphic core complexes, large-scale gold mineralization and A-type granitic intrusions in the eastern North China Craton, which are shallow crustal response of destruction and lithospheric removal of east North China Craton.

Original languageChinese
Pages (from-to)1175-1184
Number of pages10
JournalActa Petrologica Sinica
Volume24
Issue number6
Publication statusPublished - 2008
Externally publishedYes

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Keywords

  • Gudaoling batholith
  • Laser ablation Ar/ Ar dating
  • Liaodong Peninsula
  • Lithospheric thinning
  • North China Craton

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