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勉县菜马河南部徐家坪附近勉略带中多处发现基性麻粒岩岩块 ,其矿物共生组合为 :Cpx+Gt+Pl(An30 ) +Qz+Rut。采用 Ellis等温度计获得 T为 6 5 7～ 772℃ ,采用 Newton等压力计获得峰值 P达 0 .82～ 1.17GPa,考虑到该压力计获得值往往偏低 ,校正后压力最高达 0 .97～ 1.32 GPa。基性麻粒岩中存在 Gt+Cpx=Hb+Pl的退变反应 ,表明经历了等温降压过程 ,PTt轨迹为顺时针 ,反映了沿秦岭勉略带板块碰撞造山的历史
The basic granulite rock mass is found in many places in the Mian Luping zone near Xujiaping, in the south of Mêma River in Mian County. Its mineral assemblage is Cpx + Gt + Pl (An30) + Qz + Rut. Using Ellis and other thermometers to obtain T is 657 ~ 772 ℃, the use of Newton and other pressure gauge to obtain a peak P of 0.82 ~ 1.17GPa, taking into account the pressure gauge obtained values ?? are often low, the corrected pressure up to 0.97 ~ 1.32 GPa. Degenerative reactions of Gt + Cpx = Hb + P1 exist in the basic granulites, indicating that the PTt trajectory is clockwise when the temperature is depressurized, which reflects the history of collision along the Malingou plate orogen along the Qinling Ridge