wallrock alteration

• 围岩蚀变

wallrock alteration的用法和样例：

例句

1. Wallrock alternation is wide spread.The tenor of gold is low.
   矿区围岩蚀变较发育，金的品位较低。
2. The wallrock alteration shows gold deposit is related the deep magmatic instrusion.
   围岩蚀变表明与深部岩浆侵入作用有关。