Zircon SIMS ages and chemical compositions from Northern Dabie Terrain:Its implication for pyroxenite genesis  

作　　者：CHEN Daogong WANG Xiang E.Deloule LI Binxian XIA Qunke CHENG Hao WU Yuanbao 

机构地区：[1]Department of Earth and Space Sciences,University of Science and Technology of China,Hetei 230026,China [2]Department of Earth Sciences,Nanjing University,Nanjing 210008,China [3]CRPG-CNRS,Nancy 54501,France

出　　处：《Chinese Science Bulletin》2001年第12期1047-1050,共4页

基　　金：This work was supported by the Major State Basic Research Development Project (Grant No. 1999075503); and the National Natural Science Foundation of China (Grant Nos. 49973019 and 49794042).

摘　　要：We present the results of a detailed micro-scale investigation of zircons from pyroxenites, Daoshicong Northern Dabie using a combination of SIMS and ICPMS. The SIMS measurements gave ages of 134-159 Ma. Its average of (144.516.2) Ma is interpreted as the best estimate of the pyroxenite intrusion. The crystallization of zircons continued for quite a long time and underwent slow cooling. The pyroxenites are products of post-collision magmatism. The REE pattern is HREE-enriched, and its HREE concentrations fall between the magmatic and metamorphic range of gneissic zircons from the Dabie area, which indicate the involvement of crust material in its mantle source.We present the results of a detailed micro-scale investigation of zircons from pyroxenites, Daoshicong Northern Dabie using a combination of SIMS and ICPMS. The SIMS measurements gave ages of 134–159 Ma. Its average of (144.5±6.2) Ma is interpreted as the best estimate of the pyroxenite intrusion. The crystallization of zircons continued for quite a long time and underwent slow cooling. The pyroxenites are products of post-collision magmatism. The REE pattern is HREE-enriched, and its HREE concentrations fall between the magmatic and metamorphic range of gneissic zircons from the Dabie area, which indicate the involvement of crust material in its mantle source.

关 键 词：ZIRCON SIMS age ZIRCON trace element CRUST-MANTLE interaction Northern DABIE pyroxenite. 

分 类 号：P597[天文地球—地球化学]