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Geoscience ›› 2012, Vol. 26 ›› Issue (2): 308-316.

• Structural Geology • Previous Articles     Next Articles

Structural Evolution of Northern and Southern Edges of East Qinling-Dabie Orogenic Belt:Evidence from ESR Dating

 LI  Hua-Gang-1, YANG  Kun-Guang-1,2, WANG  Jun-1   

  1. 1 Faculty of Earth Sciences,China University of Geosciences, Wuhan,Hubei430074, China; 2 Key Laboratory of Tectonic and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan,Hubei430074,China
  • Received:2011-10-26 Revised:2012-02-20 Online:2012-04-20 Published:2018-09-19

Abstract:

Fifty eight samples from tectogenetic α quartz veins in northern and southern edges of East Qinling-Dabie orogenic belt were studied by the use of ESR dating method.The results show that the ESR ages of α quartz veins  mainly change between 99.2  and 3.4 Ma Combined ESR dating results with other geological evidences,it comes to the conclusion as follows:after Late Cretaceous,the evolution history of southern edge of East Qinling-Dabie orogenic belt has experienced extending and faulted depression stage(73.1-52.3 Ma),extending.squeezing transformation stage(39.1-27.2 Ma) and squeezing stage(22.8-3.4 Ma); the evolution history of northern edge of East Qinling-Dabie orogenic belt has experienced squeezing uplift stage(89-70.1 Ma), extending and faulted depressions stage(61.6-43.2 Ma), extending  squeezing transformation stage(37.2-22.6 Ma) and squeezing stage(15.6-3.9 Ma).Northern and southern edges of East Qinling-Dabie orogenic belt have similar tectonic evolution characteristics in Cenozoic. But affected by several factors, the tectonic evolution of northern and southern edges of East Qinling-Dabie orogenic belt are obviously different in Late Cretaceous.The ESR dating results are consistent with geological evidences,which checks up the dependability of ESR dating.

Key words: East QinlingDabie orogenic belt, ESR dating, Cenozoic, tectonic evolution