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测区变质岩系分布面积416平方公里,约占总面积的五分之二,自下而上为迪口组、龙北溪组、大岭组,总厚11501米。麻源组和吴挡组未在区内出露。本文在综合研究现有资料的基础上,对测区的变质岩系的构造和地层层序作一初步分析。在沉积岩区,通常是根据地层资料去控制构造。但在变质岩区,由于缺乏可靠的生物化石依据和成熟的地层层序资料,不可能这样做,相反,只有在查明区域大构造的情况下,才能基本查明地层层序。“查明变质杂岩之间的空间构造相互关系已成为确定变质岩层原来层
The metamorphic rocks in the survey area cover an area of 416 square kilometers, accounting for about two-fifths of the total area. They are Dikou Formation, Longbeixi Formation and Da Ling Formation from bottom to top with a total thickness of 11501 meters. Ma source group and Wu block group not exposed in the area. Based on a comprehensive study of existing data, this paper makes a preliminary analysis of the structure and stratigraphic sequence of the metamorphic rocks in the area. In the sedimentary area, the structure is usually controlled based on the formation data. However, in the metamorphic rock area, it is impossible to do so because of the lack of reliable biological fossil basis and mature sequence data. On the contrary, the stratigraphic sequence can only be basically ascertained in the case of identifying the large regional structure. "Identifying the spatial structure interdependencies between metamorphic complexes has become the key to determining the original metamorphic rock formation