西秦岭双王金矿床与火成碳酸岩成因关系

西秦岭双王金矿床以大量发育角砾岩型矿石为特征,金与碳酸盐矿物密切共生,在角砾岩之间呈胶结物产出,显示出强烈的幔源特点。长期以来,这种罕见的矿床类型的成因一直困扰着矿床学家。最近,在双王金矿床深部坑道内新揭露的碳酸岩墙,有可能为揭示这一科学难题提供了一个突破口。文章选择碳酸岩和金矿石为研究对象,通过光薄片观察及TIMA扫面,发现共生的副矿物锆石、磷灰石和独居石,使利用副矿物的原位微区进行高精度测年解决二者之间的成因联系成为可能。

Petrogenesis of carbonatite and its relationship to Shuangwang gold deposit

The Shuangwang gold deposit in western Qinling is characterized by a large number of breccia-type ores. The gold is closely associated with carbonate minerals, and they are both present as cementation among breccia and show a characteristic, of strong mantle source. For a long time, the genesis of this rare type of deposit has puzzled the ore deposit scientists. Recently, the newly exposed carbonatite dykes in the deep tunnel of the Shuangwang gold deposit may provide a rare opportunity to shed light on this scientific conundrum. In this paper, carbonatite and gold-bearing ore were selected as research objects, in which zircons, monazite and apatites were found by TIMA scanning. The result provides a guarantee for the genetic relationship between carbonatite and the Shuangwang gold deposit by using in situ microdating with high precision.