摘要
首次利用锆石U_Pb方法测得北祁连山西段寒山辉长岩的生成年龄为 347.1± 6 .4Ma。在空间上 ,寒山辉长岩与寒山金矿紧密相关 ,寒山辉长岩位于寒山金矿的南部 ;在时间上 ,寒山金矿的成矿时代为 339± 10Ma ,与寒山辉长岩同属华力西期 ,而且成岩时代早于成矿时代 ,因此推测寒山辉长岩可能为寒山金矿提供了热源。由于该区有较多的中酸性岩体存在 ,该成岩时代的确定对于在该区寻找金矿有重要的理论和实际意义。
The U-Pb isotopic age of Hanshan gabbro in North Qilian Mountains is 347.1±6.4 Ma, belonging to Hercynian. The Hanshan gabbro is located in the south of the deposit and is obviously related to the deposit. The ore-forming age of the deposit is 339±10 Ma, being of Hercynian too. The petrogenic age is earlier than the ore-forming age, possibly suggesting that the rock body provided heat for the deposit. This conclusion is theoretically important and practically significant in the search for gold deposits in the study area, because there occur a lot of intermediate-acid rocks there.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2004年第3期253-256,共4页
Acta Petrologica et Mineralogica
基金
原地矿部"九五"科技攻关资助项目 ( 95_0 2_0 0 4_0 3 )
关键词
寒山金矿
辉长岩
成岩时代
成矿时代
北祁连山
Hanshan gold deposit
gabbro
petrogenic age
metallogenic age
North Qilian Mountains
