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Evolution 0f Eclogite at Tiquishan,Northern Jiangsu Province:Isotopic Evidence

WANG Yin-xi1 2, LI Hui-ming1 2, GU Lian-xing2, CHEN Dao-gong3, YANG Jie-dong1 2, SHEN Ya-qian1 2, ZHAO Lin-xi4, LI Jian-hua5   

  1. 1. Center of Modern Analysis, Nanjing University, Nanjing 210093; 2. Stat Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093; 3. Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026; 4. Department of Cities and Resources, Nanjing University, Nanjing 210093; 5. Geoxploration Company No.5, Jiangsu Province, Xuzhou 221005
  • Received:2003-06-20 Revised:2003-06-20 Online:2003-06-20 Published:2003-06-20

Abstract: Sm-Nd isotope ages of 221.6±8.4 Ma,213.6±9.2 Ma and 216.6±8.1 Ma,respectively,have been obtained for three eclogite bodies in the Tiqiushan region,northern Jiangsu Province.One of the Tiqiushan eclogite bodies is dated by a Rb-Sr isochron at 201±21 Ma.The Sm-Nd age could be interpreted to record recrystallization of the Tiqiushan eclogite body at high pressure eclogite facies during exhumation of the subducted plate,whereas the Rb-Sr age may correspond to initial amphibolite-facies retrograde metamorphism of the same eclogite body.Collision between the Sino-Korean and Yangtze plates occurred around the late Triassic time.