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川北米仓山东西向伸展的火地垭群变质岩系中,蕴藏有丰富的大理岩资源。大理岩矿床沿大河坝—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。上两组板岩中夹薄厚层大理岩,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 Huadian Group metamorphic rocks stretching westward in the west of the Meikangshan in Sichuan Province have abundant marble resources. The marble deposit is exposed along Daheba-Guanba thrust belt. According to the form of deposit structure, can be divided into two types of flattening and fault block deposits. The flattened deposits are produced in the upper two groups, and the fault-type deposits are produced in the nursery group. Their formation is related to regional metamorphism, deformation and flattening and displacement. Due to the different rock assemblages, the ore body morphology and deposit structure are different. On the two sets of slate, the thin and thick marble is sandwiched between them, so the echelon, beaded and hook marble ore bodies are formed. The Maowozi Formation is composed of thick marble. Then ribbons, lamellar and lenticular ore bodies are formed.