摘要
寒山大型金矿是近年来在北祁连山西段发现的与基性火山岩有关的构造蚀变岩型金矿。作者利用Rb-Sr同位素方法测得寒山金矿的成矿时代为339Ma,属华力西期。指出寒山金矿的成矿时代应为(303～339)Ma,有多期热液叠加,多期成矿作用。因此,作者认为寒山金矿的热液很可能是青山斜长花岗岩(370±25Ma)、寒山辉长岩(347.1±6.4Ma)共同提供的。由于该区有较多的中酸性岩体存在,现成矿时代的确定对于该区在寻找华力西期-加里东晚期蚀变岩型金矿具有重要意义。
Recent discovered Hanshan gold deposit is a structure-controlled altered rock type related with intrusive rocks in North Qilian Mountain. Metallogenetic age of the deposit may be 339Ma, measured by Rb-Sr isochronic method, which belongs to the Hercynian. Ore-forming fluids might be provided by Qingshan granodiorite (370±25Ma) and Hanshan gabbro (347.1±6.4Ma). Defining of gold metallogenetic age has theoretical and practical significant to looking for structure-controlled altered rock type gold deposits in the area
出处
《地质与勘探》
CAS
CSCD
北大核心
2005年第3期12-15,共4页
Geology and Exploration
基金
原地矿部"九五"科技攻关课题(编号:95-02-04-03)资助。
