The ore-forming process of the alkaline type deposits lasted from Mesoproterozoic to Himalayan, mainly in Mesoproterozoic and Variscan periods.

 
  • 堿性巖型礦床的形成時(shí)代從元古宙到喜馬拉雅期,主要集中在中元古代及華力西-印支期。
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