Geochronology and Geochemistry of Middle–Late Ordovician Granites and Gabbros in the Erguna Region,NE China:Implications for the Tectonic Evolution of the Erguna Massif  

作　　者：Shuo Zhao Wenliang Xu Wei Wang Jie Tang Yihan Zhang 

机构地区：[1]College of Earth Sciences, Jilin University [2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

出　　处：《Journal of Earth Science》2014年第5期841-853,共13页地球科学学刊（英文版）

基　　金：financially supported by the National Key Basic Research Program of China (Nos. 2013CB429802 and 2013CB429803);the National Natural Science Foundation of China (No. 41272077);by the Opening Foundation of the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (No. GPMR201104)

摘　　要：Zircon U-Pb ages, Hf isotope data and whole-rock major and trace element data for the Middle to Late Ordovician gabbros and granites in the Erguna Massif, NE China were presented in this paper. The petrogenesis of these rocks and the Early Paleozoic tectonic evolution of the massif were discussed. Zircons from the granites and gabbros are of magmatic origin based on their cathodoluminescence（CL） images. The 206Pb/238 U ages obtained from 20 spots on zircons from the granites range from 446±9 to 464±10 Ma, yielding a weighted mean age of 455±10 Ma; and 16 spots on zircons from the gabbros range from 465±10 to 466±7 Ma, yielding a weighted mean age of 465±2 Ma. Chemically, the Late Ordovician granites in the Erguna Massif are weakly peraluminous and similar to A-type granites. The granites and gabbros are all enriched in light rare earth elements and large ion lithophile elements（e.g., Rb, K）, and depleted in heavy rare earth elements and high field strength elements（e.g., Nb, Ta, and Ti）; they all exhibit marked negative Eu anomalies. Their zircon εHf（t） values range mainly from ＋1.86 to ＋6.21（for the granites） and ＋1.39 to ＋3.89（for the gabbros）, except for one spot with a value of-0.27（for a gabbro）. The TDM1 ages for the gabbros and TDM2 ages for the granites vary from 928 to 1 091 Ma and from 1 287 to 1 675 Ma, respectively. It is concluded that the primary magma of the granites could have been derived by partial melting of Mesoproterozoic newly accreted crustal material, whereas the primary magma of the gabbros originated by partial melting of a depleted mantle wedge that had been metasomatized by fluids derived from a subducted slab. These Middle-Late Ordovician granites and gabbros constitute a typical bimodal igneous rock association, implying an extensional environment that was probably related to the post-collisional development of the Erguna and Xing＇an massifs in the early Early Paleozoic.Zircon U-Pb ages, Hf isotope data and whole-rock major and trace element data for the Middle to Late Ordovician gabbros and granites in the Erguna Massif, NE China were presented in this paper. The petrogenesis of these rocks and the Early Paleozoic tectonic evolution of the massif were discussed. Zircons from the granites and gabbros are of magmatic origin based on their cathodoluminescence（CL） images. The 206Pb/238 U ages obtained from 20 spots on zircons from the granites range from 446±9 to 464±10 Ma, yielding a weighted mean age of 455±10 Ma; and 16 spots on zircons from the gabbros range from 465±10 to 466±7 Ma, yielding a weighted mean age of 465±2 Ma. Chemically, the Late Ordovician granites in the Erguna Massif are weakly peraluminous and similar to A-type granites. The granites and gabbros are all enriched in light rare earth elements and large ion lithophile elements（e.g., Rb, K）, and depleted in heavy rare earth elements and high field strength elements（e.g., Nb, Ta, and Ti）; they all exhibit marked negative Eu anomalies. Their zircon εHf（t） values range mainly from ＋1.86 to ＋6.21（for the granites） and ＋1.39 to ＋3.89（for the gabbros）, except for one spot with a value of-0.27（for a gabbro）. The TDM1 ages for the gabbros and TDM2 ages for the granites vary from 928 to 1 091 Ma and from 1 287 to 1 675 Ma, respectively. It is concluded that the primary magma of the granites could have been derived by partial melting of Mesoproterozoic newly accreted crustal material, whereas the primary magma of the gabbros originated by partial melting of a depleted mantle wedge that had been metasomatized by fluids derived from a subducted slab. These Middle-Late Ordovician granites and gabbros constitute a typical bimodal igneous rock association, implying an extensional environment that was probably related to the post-collisional development of the Erguna and Xing＇an massifs in the early Early Paleozoic.

关 键 词：Erguna Massif Ordovician magmatism GEOCHRONOLOGY GEOCHEMISTRY petrogenesis tectonic implication. 

分 类 号：P588.12[天文地球—岩石学] P597.3[天文地球—地质学] P534.42