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丁家山铅锌矿矿床的成因复杂,主要存在矽卡岩型与块状硫化物型两种争议。尝试从稀土元素地球化学的角度对其成因进行重新探讨。结果表明:矿床的主要矿源层为元古代龙北溪组上段大理岩地层,而非中新元古代东岩组绿片岩地层;所谓的“绿片岩”为燕山期中酸性岩浆侵入体与经过区域变质的钙质泥岩、钙质粉砂质泥岩、钙质泥质粉砂岩和泥灰岩发生双交代作用所形成的矽卡岩,而非绿片岩相遭受区域变质;成矿流体主要来源于大理岩地层,少量来自岩体,而非多来源;成矿时代为燕山期,故矿床成因应为矽卡岩型。
The genesis of Dingjiashan Pb-Zn deposit is complex, mainly including two types of skarn type and massive sulfide type. Attempt to re-examine the genesis from the perspective of REE geochemistry. The results show that the main source bed of the deposit is the upper marble of the Longbeixi Formation in the Proterozoic, not the greenschist strata of the Middle-Neoproterozoic Dongyan Formation. The so-called “green schist” is the intermediate and intermediate magmatic intrusions in the Yanshanian The metamorphic calcareous mudstone, calcareous silty mudstone, calcareous muddy siltstone and marl occur during skarn formation instead of metamorphic metamorphism. The ore-forming fluid mainly comes from The marble strata, a small amount from the rock mass, rather than more sources; mineralization age Yanshan period, so the deposit should be skarn type.