岩石密度测量在黑龙江伊春地区花岗岩体就位机制研究中的应用

通过对伊春地区花岗岩体的密度特征的研究,认为该区晚奥陶世花岗岩体的侵位以构造扩展机制为主,气球膨胀作用为辅,最后发生了顶蚀作用.晚石炭世花岗岩是以强力旋转上升定位的气球膨胀作用机制为主,构造扩展机制为辅.晚三叠世-早侏罗世二长、正长花岗岩体就位过程中构造扩展机制起主导作用,岩浆底辟作用也较强;早侏罗世碱性花岗岩体岩浆就位过程中以强力的气球膨胀作用为主,构造扩展机制为辅.

Application of the Surveying Rock Density in the Research Emplacement Mechanism of Granite Plutons in Yichun Area,Heilongjiang Province

Through the studies on density features of granite body in Yichtm area, the authors consider that the emplacement mechanism of late Ordovician granite are dominated by tectonic extension, and subordinated by balloon swelling, at last it takes place stoping. The emplacement mechanism of late Carboniferous granite are dominated by strong and rotary balloon swelling, and subordinated by tectonic extension. In the Triassic-early Jurassic, the emplacement mechanism of monzonitic granite and orthoclase granite is dominated by tectonic extension and the diapirism is strong. The strong balloon swelling is dominant and tectonic extension is subordinate during the emplacement mechanism of early Jurassic alkali granite.