香炉碗子金矿床地球化学特征及矿床成因讨论

Discussion on geochemical characteristics and genesis of Xing Lu Wan Zi Gold Deposit

通过对香炉碗子金矿床中稀土元素及硫、铅、氢、氧同位素地球化学研究表明，矿床中矿石与主要赋矿围岩次火山隐爆角砾岩、霏细岩、变辉绿岩的稀土元素配分模式和特征值相近，围岩提供了成矿物质来源；矿石硫同位素组成显示出硫主要来自深源岩浆源；矿石铅同位素组成显示出铅来源单一，来自上地幔或下地壳；氢氧同位素组成显示出成矿流体除岩浆水外，还有大气降水加入。成矿与燕山期次火山活动密切相关，成因应属浅成次火山热液型金矿床。

The study on geochemistry of the rare earth elements(REE)and the isotopes of sulfur,lead,hydrogen and oxygen in the gold deposit showed that the distribution patterns of REE of the secondary volcanic concealed explosive breccia,felsite and metadiabase in the ore and country rock were similar to their characteristic values,manifesting that the country rock provided mineralization with material source;the composition of the isotopes of sulfur in the ores demonstrated that the sulfur was mainly from deep seated magmatic source;the composition of the isotopes of lead in the ores showed that the lead was uniquely from upper earth′s mantle or lower earth′s crust and the composition of the isotopes of hydrogen and oxygen indicated that there were atmospheric water joining into the mineralizing fluid besides magmatic water.As a result ,the mineralization has close relation with secondary volcanic activities of Yanshan period.The gold deposit belongs to hypabyssal secondary volcanic hydrothermal solution type.