经后期区域变质作用使磷块岩变质成磷灰岩矿床。
Through late regional metamorphism, the phosphorite was turned into the apatite deposit.
盆地周围为前震旦纪变质岩系及古生代灰岩、页岩组成的高丘、低山。
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the sixth period of the Paleozoic Era, characterized by the development of coal-bearing rock formations.
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