铜同位素地球化学研究及其在矿床学应用的评述和讨论

不同地质条件和成矿环境中的铜同位素组成有显著差异,表明利用含铜矿物的铜同位素组成可以作为成矿物质来源的示踪剂.并且,由于铜是主要成矿元素之一,所以铜同位素对于成矿物质来源和成矿过程的示踪更为直接.文章介绍和评述了铜同位素的测试、研究和应用的进展,认为当前对于铜同位素分馏知识的匮乏严重制约着铜同位素研究和应用.从同位素分馏的基本原理出发,提出了铜同位素分馏研究的思路以及可能的分馏规律,对于已发表的部分地质样品测试数据,给出了新的解释,并预测溶解于海水中的铜离子应亏损65Cu.

PROGRESS IN STUDY OF COPPER ISOTOPE AND ITS APPLICATION IN METALLOGENY:A REVIEW

Copper isotope composition significantly varied in differing geological and metallogenic environments. It has been shown that Cu isotope of Cu-bearing minerals may be used as an indicator to trace source of ore-forming metals. Moreover, as one of major ore-forming elements, copper isotope composition can directly trace ore-metal source and ore-forming process. This paper briefly introduces and reviews the progresses in analytical technique, geological study and application. It is found that paucity of understanding of copper isotopic fractionation strictly blocks the study of copper isotope studies and applications. Therefore, it is suggested to study copper isotope fractionation and several possible fractionation regularities. Published copper isotope data of geological samples are alternatively interpreted, and the dissolved copper in seawater is argued to be depleted in ~(65)Cu.