山东张里金矿碱性次火山岩特征与成矿作用

山东张里金矿床是与碱性次火山岩有关的、赋存于隐爆角砾岩体内的石英－ 冰长石－ 萤石型中低温热液矿床。岩石化学、稀土元素和同位素分析结果表明: 控矿岩石系列分为: ①高钾钙碱性岩石系列，SiO2 平均含量为57. 6%，稀土总量为373. 98 × 10 － 6 ～ 297. 43 × 10 － 6，δEu 为0. 85 ～ 0. 82，Sr = 0. 704 41; ②高钾碱性岩系列，SiO2 平均含量为56. 65%，稀土总量为371. 19 × 10 － 6 ～ 41. 62 × 10 － 6， δEu 为0. 89 ～ 0. 93，Sr = 0. 717 11。这两种控矿岩石系列分别由两个不同的幔源岩浆在上升过程中，各自经过长时期的分异作用，并且混染了部分壳源物质而成，其含矿热液来自碱性次火山岩。

Characteristics of alkaline sub-volcanic rocks and mineralization in Zhangli gold deposit of Shandong

Zhangli gold deposit is a quartz-ice feldspar-fluorite type middle-low temperature hydrothermal deposit hosted in concealed explosive breccia pipe related with alkaline sub-volcanic rocks.The results of rock chemistry,REE and isotope analysis indicate that the ore-controlling rock can be divided into two series including: ① high——K calc-alkaline rock series,which SiO2 content is 57.6% on average,total rare earth is 373.98×10-6~297.43×10-6,δEu is 0.85~0.82,Sr is 0.704 41;② high——K alkaline rock series,which SiO2 content is 56.65% on average,total rare earth is 371.19×10-6~41.62×10-6,δEu is 0.89~0.93,Sr is 0.717 11.The two rock series were formed by different mantle magma,which experienced long differentiation,and mixed partial crustal material in rising process,and the ore-bearing hydrothermal solution came from alkaline sub-volcanic rocks.