摘要
高松山浅成低温热液金矿床,赋存于下白垩统安山岩等中酸性火山岩中。矿体受围岩中断裂破碎带的控制,呈脉状产出。同位素地球化学研究显示,该矿床成矿溶液系大气降水补给的地下热水;金属组分来自含矿的火山岩内;矿石铅H-H单阶段模式年龄平均值为73.5 Ma,成矿时代属燕山晚期。矿床的形成与地下热水的活动密切相关。当大气降水下渗,经加热并持续溶滤火山岩层中的成矿物质,最终构成含矿地下水热液。含矿地下水热液在环流过程中进入减压带—断裂破碎带时,由于温度、压力、Eh值和pH值等物理化学条件的改变而使热液发生卸载,矿质得以沉淀析出。
The Gaosongshan epithermal gold deposit is hosted in the Lower Cretaceous andesite. Ore bodies occur as veins controlled by fractured zones in wall rocks. Study on isotopic geochemistry indicates that the ore-forming fluid of the deposit is mainly derived from meteoric water with metal components provided by ore-bearing volcanic rocks. The average H-H single-stage model age of ore lead is 73.5 Ma, indicating that the deposit is formed during the Late Yanshanian. The formation of deposit is closely related with the activity of geothermal water. When ore-bearing geothermal water reaches fractured zones during circulation, ore materials precipitate from hydrothermal solution due to the change of physical-chemical conditions such as temperatre, pressure, Eh, and pH.
出处
《矿物学报》
CAS
CSCD
北大核心
2013年第1期101-109,共9页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(批准号:40930423
40873036)
国家重点基础研究发展计划(资助号:2009CB421003-01)
高等学校学科创新引智计划(资助号:B07011)
