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40Ar/39Ar Isotopic Dating and Geological Significance of Mafic Rocks from the Jixi Basin, Heilongjiang Province

ZHU Zhan-ping1， LIU Li1，MA Rui1，QIU Zeng-kai2，MA Sheng-hui1   

  1. 1.College of Earth Sciences, Jilin University, Changchun 130061，China;2.College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061，China
  • Received:2008-08-15 Revised:1900-01-01 Online:2009-03-26 Published:2009-03-26
  • Contact: ZHU Zhan-ping

Abstract: The Chengzihe Formation in Zhangxin area of Jixi basin,Heilongjiang Province is intruded by the algorite sill. The mafic rocks are pure, porphyritic and contain no xenolith. The phenocrysts include ordinary augite and plagioclase and make up 35%-40% of the rock. The diabase has same 40Ar/39Ar platform and isochron age of 96-101 Ma within error limit, showing a formation age of the Albian-Cenomanian. Considering the feature of this episode of regional magmatic event, the measured age reveals that the Zhangxin area of the Jixi basin, Heilongjiang Province during the later stage of the Early Cretaceous and Early stage of the Late Cretaceous was under backarc extension within a general tectonic regime of ancient Pacific plate(Izanagi-Kula plate) subduction underneath the East Asia continental plate.

Key words: mafic rock, 40Ar/39Ar isotopic dating, Jixi basin

CLC Number: 

  • P618.13
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