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查明超高压变质岩系的原岩、原岩建造,是认识变质前历史、探讨超高压变质作用地球动力学机制和陆壳再循环的重要环节。近来的研究表明,大别山造山带中出露的超高压变质岩系的原岩,主要为基性火山岩、碳酸盐岩、碎屑岩等陆壳岩石。安徽省岳西县境内超高压变质岩分布较广,其中碧溪岭地区发育了大别山造山带中出露面积最大的以榴辉岩为主的超高压变质岩组合(图1)。大多数研究者认为碧溪岭超高压变质岩组合的原岩属镁铁质—超镁铁质侵入岩,因而称为碧溪岭岩体(张旗1993,刘若
It is an important step to recognize the history before metamorphism and to investigate the geodynamics mechanism of UHP metamorphism and continental crust recycle. Recent studies have shown that the original rocks of the UHP metamorphic rocks exposed in the orogen of the Dabie Mountains are mainly composed of crustal rocks such as basic volcanic rocks, carbonate rocks and clastic rocks. The EHV metamorphic rocks are widely distributed in Yuexi County, Anhui Province. Among them, the Ebian metamorphic rocks that are the most exposed in the Dabieshan orogenic belt have been developed in the Bixiling area (Fig. 1). Most researchers believe that the Bixi Ling ultrahigh-pressure metamorphic rock assemblage of protolithic mafic-ultramafic intrusive rock, which is called Bixiling rock (Zhang Qi 1993, Liu Ruo