Why Small Granitic Stocks Associate with Giant Mineral Systems?

The view of "small intrusions hosting large mineral deposits" scientifically summarized the features of magmatic-hydrothermal mineralizations,which has been evidenced to be an effective exploration criterion.However,why the small intrusions generally associate with large or giant mineral systems remain open to study.The author proposes that the small granitic stocks,compared to huge batholiths,are favorable for metal enrichment during magma generation and evolution,for fluid migration and metal transportation,and accommodating metal precipitation and accumulation.