东秦岭地区下地壳麻粒岩的地球化学与地球物理性质

GEOCHEMISTRY AND GEOPHYSICAL PROPERTIES OF THE LOWER CRUST GRANULITES FROM QINLING OROGENIC BELT

The lower continental crust plays a crucial role in continental evolution and mountain building. It is widely accepted that the lower crust is dominated by granulites , mafic or felsic. The paper presents our studies on geothermobarometry , geochemistry and geophysical proper-ties of granulites from two adjacent tectonic units , graunlites from the late Archean Taihau complex in the southern margin of the North China craton in Lushan and from the early Proterozoic Dahe formation in the Qinling orogen in Tongbai, eastern Henan. The results indi-cate that the granulites from the two units were formed within the P ?T regime of the lower crust but in the distinct environments.