大别超高压变质地体的岩石组合及其演化--以皖西南碧溪岭和双河地区为例

Rock association and its evolution in the Bixiling and Shuanghe areas in the Dabie UHP metamorphic terrane, southwestern Anhui

摘要: 碧溪岭和双河地区是大别超高压地体内2个典型的露头区,通过野外露头观察、岩相学和岩石化学研究发现,岩石组合主要为榴辉岩、斜长角闪岩、片麻岩和面理化花岗岩。榴辉岩具有壳源的特点,是地壳岩石在地幔深处发生超高压变质作用形成的;斜长角闪岩为板块折返期间榴辉岩的退变质产物;片麻岩为斜长角闪岩在折返过程中在合适的环境下深熔递进演变的产物;而面理化花岗岩是片麻岩部分熔融的结果。榴辉岩与片麻岩和面理化花岗岩之间为经过改造的原地关系。

Abstract: Bixiling and Shuanghe are two typical outcrop areas in the Dabie ultrahigh-pressure (UHP) metamorphic terrane. Based on field outcrop observations and petrographic and petrochemical studies, the authors find that the rock association consists predominantl