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Rb─Sr Isotopic Dating of Mylonitize Granite in Southeast Mid-Da Hinggan Mountains

LI Guang-rong1,CHI Xiao-guo1,DONG Chun-yan2,LIU Jian-feng1,ZHAO Yuan-dong1 1.College of Earth Sciences,Jilin University,Changchun 130026,China 2.Institute of Geology,Chinese Academy of Geology Sciences,Beijing 100037,China  
There are mylonitize granite distributing in southeast Mid-Da Hinggan Mountains of Zhalantun area.In 1∶200 000 geologic map,they were considered to be mixed metamorphic rocks judging by the appearance,metamorphic protholith formation and the occurrence,and as the crystalline basement of Erguna-Hinggan terrane formed in early Proterozoic.With the advent of geochronology research upsurge in Da Hinggan Mountains,the mylonitize granite has gone into the table.The Maoniugou pluton located in the transition of southeast Mid-Da Hinggan Mountains and Songliao basement has eyeball structure and of whose whole rock-feldsper Rb-Sr dating is(173±3.45) Ma,I_(Sr)=0.733 0±0.000 61.Maybe there is Paleozoic radiated strontium that lead to high initial strontium.Conbine with fieldwork and oriented slice of the mylonitize granite,we get the conclusion that the mylonitize granite was the production of left slip including thrust event of which makes significance to the evolution of Da Hinggan Mountains.
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