They are genetically related to Yanshanian intermediate_acid granites distributed extensively in East Qinling area and occur along the endo_ and exo_contact zones of the porphyry.

• 其形成与燕山期中酸性浅成_超浅成小花岗斑岩体有关，钼矿床直接产于岩体内外接触带及其附近；