Discovery of ca.2.5 gacharnockite in the Daqing Mountains——Implications for the petrogenetic model of anatectic garnet granite
In China,the early Precambrian basement of the Western block is widely distributed on the northern margin of the North China Craton.Previous study generally suggests that these old rock was influenced by four metamorphic thermal events at ca.2.5 Ga,ca.2.45～2.37 Ga,ca.1.95 Ga and ca.1.85 Ga.The study of the ca.2.5 Ga charnockite from the Yinshan Block which has become a hot topic in revealing the early Precambrian tectonic evolution of on the northern margin of the North China Craton,however,there are few reports of late Neoarchean tectonic thermal events in the Khondalite Belt.In recent years,a stage of Daqing Mountains supracrustal rock,with a metamorphic zircon age at 2.45～2.37 Ga,has been identified from the Khondalite Belt(eg.Garnet biotite gneiss)of the Daqing Mountains area.In field,the Daqing Mountains supracrustal rock and anatectic garnet granite are closely related to each other,however,the mode of its anatectic genesis is still controversial.Herein,we present new geochronological of zircon U-Pb isotopic data via analysis using a sensitive high-resolution ion microprobe for charnockites,and comparing the field spatial output relationship and zircon chronologyits analysis to the garnet granite and its surrounding rocks in the Daqing Mountains terrane.Our aims are to provide the important insights for exploring the genetic model of anatectic garnet granite.
Daqing Mountains areacharnockitegarnet granitepetrogenetic model
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