Ferreous layers are formed during the volcanic dormant period.After the original ferreous layers formed, metamorphism played the most important role in the formation of ore Deposit.

• 在原始的含铁层位形成以后,变质作用是矿床形成的至关重要的条件,高绿片岩相-角闪岩相变质作用对矿床的形成最为有利;