摘要
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。
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.
出处
《世界地质》
CAS
CSCD
2012年第1期93-99,共7页
World Geology
基金
山东省平邑县张里金矿床成矿规律及找矿预测研究(HJ08-2-2)
关键词
张里金矿
成因类型
碱性火山岩
山东
Zhangli gold deposit
genetic type
alkaline volcanic rocks
Shandong
