河北省承德县磴西—烟筒山一带银铅锌多金属矿地质特征及矿床成因

Geological characteristics and Genesis of Ag-Pb-Zn polymetallic deposits in Dengxi-Yantongshan area,Chengdu county,Hebei province

河北省承德县磴西—烟筒山一带银铅锌多金属矿位于温家沟—东山断裂带内,区内已知有姑子沟银铅锌矿、富豪银矿,以及新发现的富含金银的锌多金属矿。矿体多为隐伏矿体,受断裂破碎带的控制;矿体呈单脉、复脉状产出,有分支复合特点,银铅锌金等多金属矿共生;同位素地球化学特征和包裹体地球化学特征显示,成矿元素、硫和热液主要为地壳深部的岩浆来源,与燕山晚期的浅成超浅成侵入岩有关,成矿温度为中温中高温,成矿压力250×10^(5)~350×10^(5) Pa,成矿深度0.9~1.3 km,成矿时代为早白垩世晚期,略晚于石英斑岩的形成;矿床类型为与燕山晚期浅成超浅成岩浆和断裂破碎带有成因联系的中温中高温岩浆热液型矿床。

Ag-Pb-Zn poly metallic deposits in Dengxi-Yantongshan area are located in the Wenjiagou-Dongshan fault zone.Ore bodies of Guzigou Ag-Pb-Zn deposit,Fuhao Ag deposit and the newly discovered Au,Ag-bearing Zn deposits are generally blind single or composite veins controlled by fractural zones and characterized by ramification and compounding.Isotope and fluid inclusion geochemical results show that the ore elements,sulfur and hydrothermal fluid are derived from Magma at deep crust and related to Late Yanshanian epi-super-epi-intrusive rocks.The ore deposits are formed in Early Cretaceous Epoch,slightly later than the quartz porphyry at depth of 0.9-1.3 km under condition of medium-medium-high temperature and 250×10^(5)-350×10^(5) Pa.They are medium-medium-high temperature magmatic hydrothermal deposit related genetically to Late Yanshanian epi-super-epi-Magma and fault zone.