On the condition of thermal contact metamorphism, clay minerals in coal are changed into andalusite.无烟煤中红柱石是煤中粘土质矿物经热接触变质作用形成的.The process of alternating solid rock masses is called metamorphism.固体岩体变换的过程即所谓变质作用.Dynamica...
The process of alternating solid rock masses is called metamorphism.固体岩体变换的过程即所谓变质作用.Danba area has undergone multiperiod deformation, metamorphism and magmatism since Mesozoic time.丹巴地区自中生代以来经历了多期的变形 、 变质和岩浆作用.The metal...