小秦岭基性脉岩与金矿化的若干问题讨论

A DISCUSSION ON PROBLEMS CONCERNING BASICDYKES AND GOLD MINERALIZATIONIN XIAOQINLING AREA

本文研究了小秦岭地区脉状金矿床与基性脉岩的形成年龄以及联、硫同位素组成特点，并探讨了基性脉岩（特别是煌班岩脉）与金成矿之间的关系。认为本区煌斑岩浆的活动时间与金成矿时代基本一致，是金成矿最接近的热事件；富含挥发分的煌斑岩浆活动为金成矿提供了热能和重要矿化剂－Ｃ、Ｓ、Ｃｌ、Ｎａ等。另外，基性脉岩的蚀变作用还为金成矿提供了沉淀剂－Ｆｅ、Ｍｇ、Ｃａ等。

The paper shows the forming age of vein gold deposits and basic dykes in Xiaoqinling area, and studies the sulfur and carbon isotopic compositional characteristic, and thereletionship between basis dykes(especially lamprophyric dike rock)and gold mineralizationhas also been discussed.It's Concluded that the active time of lamporphyric magma was approximatively same as gold mineralization age. So it is the hot event that approaches to theage of gold mineralization. The activity of lamprophyric magma abounded with volatile component supplies the origin of hot and important mineralizers(C,S,Cl,Na,etc),and the alteration of basis dykes supplies the precipitating agents -such as Fe, Mg,Ca,etc-for goldmineralization.