小秦岭地区中深部含金石英脉的同位素地球化学特征及其意义  

Isotope geochemical characteristics of auriferous quartz veins from medium and great depths of Xiaoqinling area, central China and their significance

作　　者：王义天[1] 毛景文[1,2] 叶安旺 叶会寿[4] 李永峰[4] 卢欣祥 李永革 

机构地区：[1]中国地质科学院矿产资源研究所 [2]中国地质大学地球科学与资源学院,北京100083 [3]河南省灵宝市地质矿产局 [4]中国地质大学地球科学与资源学院 [5]河南省地质科学研究所

出　　处：《矿床地质》2005年第3期270-279,共10页Mineral Deposits

基　　金：国家自然科学基金(40434011;40102019);国家重点基础研究发展计划(G1999043211)的联合资助

摘　　要：对小秦岭地区中深部含金石英脉的氢、氧、硫、氦和氩同位素地球化学研究表明,本区的成矿流体主要来源于深部,随着成矿过程的进行,表现出深源流体不断与浅部流体混合的演化趋势。结合前人的研究成果,根据成矿作用与区域伸展构造演化之间的耦合关系,指出小秦岭地区金的成矿作用主要发生于中生代晚期的后碰撞阶段,在由深部过程引发的伸展构造背景下,深部流体沿伸展构造系统向上运移,不断与浅部流体混合,与围岩发生水_岩相互作用,使流体系统中的成矿物质不断富集,最终在剪切扩容空间中富集成矿。H, O, S, He and Ar isotopes of gold-bearing quartz veins from the medium and great depths of Xiaoqinling area in central China were studied in this paper. The data obtained indicate that the ore-forming fluids were dominantly derived from the upper mantle and gradually mixed with crustal fluids along with the metallogenic process. According to the temporal and spatial link between the gold mineralization and the tectonic evolution of regional extension in combination with other researchers' achievements, the authors hold that the main gold mineralization in Xiaoqinling area occurred at the post-collisional stage of Late Mesozoic, being products of the regional extension resulting from the deep process. The extensional tectonic system provided dilatational space for migration, mixing and water/rock interaction of the ore-forming fluids as well as gold enrichment and deposition.

关 键 词：地球化学 含金石英脉 氢、氧、硫、氦、氩同位素 成矿作用 伸展构造 小秦岭 

分 类 号：P618.51[天文地球—矿床学]