为何在变质岩里只有看到几种矿物组合?? 区域变质相 砂岩分类 岩石、矿物的风化过程 岩浆、岛弧系统的岩石 变质岩相可能会考 为何大多变质岩都是较老岩层，却又可以发现新鲜的gneiss 玄武岩和花岗岩的最终产物是否相同，试述之 □calcite的生成环境和其他岩石的生成环境有何不同？ 且为何calcite一般都没有杂质？ 4 .Define the following rocks： (1)andesite (2)gabbro (3)nephelinite (4)peridotite (5)rhyolite 5 .What will be the final products after several weathering of granites? 6 .State the parameters generally used for the classification of sandstone? 7 .What is the most voluminous sedimentary rock？Why? 8 .Define metamorphism? 9 .State the concept of metamorphic facies? 10 .Metamorphic rocks generally have a simple mineral assemblage, say, less than 5 mineral species, why? --

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