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本文根据岩石学、岩石化学及锆石U-PB同位素等特征,对嫩江县科洛地区超基性岩体的构造成因及年代学特征进行了研究讨论。该套岩石具橄榄质和玄武质科马提岩特征,与岩浆成因的地幔型超镁铁质岩相比更富MGO贫K2O、NA2O、TIO2,性变质成因超基性岩体;在超基性岩体中分为获得了918MA的原岩结晶年龄及160-175MA变质峰期年龄、、。讨论认为科洛地区超基性岩体与其赋存的新开岭岩群变质岩为同构造时期的产物,因此超基性岩体中取得的锆石U-PB年龄对科洛地区新开岭区的形成时期及变质时期的确立具有重要的意义。
Based on the characteristics of petrology, petrochemistry and zircon U-PB isotopes, the paper discussed the tectonic causes and chronology of ultramafic rocks in the Kolo area of Nenjiang County. This set of rocks is characterized by olivine and basaltic kamalaite and is more rich in MgO-poor K2O, NA2O, TIO2, metamorphic ultramafic rocks than mafic-type mafic ultramafic rocks. Sexual rock mass is divided into 918MA obtained the original rock crystallization age and 160-175MA metamorphic peak age ,,. It is discussed that the ultrabasic rocks in the Korlo area and the Xinkailing group metamorphic rocks that they occur are the products of the same tectonic period. Therefore, The formation of the district and the establishment of the metamorphic period are of great significance.