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川北米仓山东西向伸展的变质岩内火地垭群变质岩系中,藏有丰富的大理岩资源。大理岩矿床沿大河坝一关坝冲断带出露。按矿床构造的形式,可分为压扁型和断块型两种矿床类型。 压扁型矿床产于上两组内,断块型矿床产于麻窝子组内。它们的形成均与区域变质作用、变形压扁及置换作用有关。由于两者的岩石组合不同,因而矿体形态和矿床构造各异。上两组板岩中夹薄层大理岩,故形成雁列式、串珠状、钩状大理岩矿体;麻窝子组由厚层大理岩组成,则形成带状、层状和透镜状矿体。
The metamorphic rock in the metamorphic rocks in the metamorphic rocks extending from east to west in Micangshan, northern Sichuan, is rich in marble resources in metamorphic rocks. The marble deposits were exposed along the thrust belt of the Daheba dam. According to the structure of ore deposits, it can be divided into two types: flattened type and faulted type. Flattened deposits are produced in the upper two groups, and fault block deposits are produced in the Mawozi group. Their formation is related to regional metamorphism, deformation compaction and displacement. Because of the different rock composition of the two, the shape of the ore body and the structure of the deposit vary. In the upper two sets of slate, a thin layer of marble is sandwiched, so that geese-like, bead-like, and hook-shaped marble ore bodies are formed; the Mawozi group is composed of thick layers of marble, forming banded, lamellar, and lenticular ore deposits. body.