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本文从野外地质证据、构造分析以及与相邻地区混合岩的对比等方面,阐明江西永平地区混合岩形成的时代属中生代,以印支期的可能性最大。以混合岩化程度由弱到强、矿物组分、结构特征,初步将混合岩在空间上划分为三个相带。根据混合岩区域性的广泛分布,渐变过渡关系,混合岩化作用的不均匀性,显微交代结构的广泛发育,化学成分的变化以及区内未见有与混合岩直接关系的规模较大的侵入体等方面的事实为依据,认为永平地区的混合岩主要是由碱质和硅质的交代作用而形成的时代较新的区域性的混合岩。
From the field geological evidence, the tectonic analysis and the comparison with the mixed rocks in the adjacent areas, this article elucidates that the formation age of the mixed rocks in the Yongping area of Jiangxi Province belongs to the Mesozoic era and the Indosinian period is the most likely. The mixed rock is divided into three facies belts spatially from weak to strong, mineral composition and structural features. According to the wide distribution of the migmatites, the gradual transition, the heterogeneity of the migmatisation, the extensive development of the microscopic metasomatic structures, the changes of the chemical composition, and the large scale without any direct relationship with the migmatites Intrusions and other facts as the basis, that the Yongping area is mainly composed of mixed rock and alkali metasomatism and the formation of the age of the more recent regional mixed rock.