摘要
赤峰—朝阳地区金矿床主要产在太古代变质岩和海西、燕山期花岗岩组成的隆起带中。铅同位素研究表明:本区金矿床的成矿物质有两个来源,一个是太古代变质岩层,另一个是上地幔,二者在燕山晚期混合形成矿床。
The gold deposits in Chifeng-Chaoyang Area are located in the uplifted zones which are consistedof Archean metamorphic rocks and Hercynian-Yanshanian granites. The pyrites and galenas from the gold deposits in the area display a significant range of lead iso-tope compositions and fall on a linear array in the ^(207)Pb/^(204)Pb vs.^(206)Pb/^(204)Pb diagram. We considerthat the linear array may have ben produced by the mixing of lead from two different sources. One isArchean matamorphic rock and the other is upper mantle. The gold mineralization is closely related to the granites and diorites of the late Yanshan periodabout 100Ma.
出处
《地质找矿论丛》
CAS
CSCD
1991年第2期91-98,共8页
Contributions to Geology and Mineral Resources Research
