埃达克岩与Cu-Au成矿作用:有待深入研究的岩浆成矿关系  

Adakite versus porphyry copper and epithermal gold deposits: a possible metallogenetic specialization of magmatism required in-deep assessment.

作　　者：刘红涛[1] 张旗[1] 刘建明[1] 叶杰[1] 曾庆栋[1] 于昌明[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《岩石学报》2004年第2期205-218,共14页Acta Petrologica Sinica

基　　金：中国科学院院知识创新工程重要方向项目<大兴安岭典型矿床建模;成矿规律研究及资源远景预测>(项目编号:KZCX3-SW-138)的资助

摘　　要：研究表明,环太平洋地区新生代斑岩铜矿和浅成热液金矿与同期的埃达克质岩浆活动存在密切的时空与成因联系。埃达克岩是许多世界级的斑岩铜矿的容矿岩,也是许多浅成热液矿化系统的成矿母岩浆。根据目前的研究。二者成因联系可能在于埃达克质岩浆的富流体、高氧逸度和基性源岩等固有属性,有利于Cu、Au等深源金属元素的萃取与富集成矿。因此,这可能是一种潜在的岩浆成矿专属性关系,但对产生这种关系的原因与机制仍然不十分清楚。这有待于今后深入开展成矿与无矿的埃达克岩、成矿的埃迭克岩与非埃达克岩、无矿的埃达克岩与非埃达克岩等方面的对比研究。以揭示这种成矿专属性的本质。It has been revealed that most world-class porphyry copper and epithermal gold deposits of Cenozoic age around Pacific Rim, such as those occur-red in the Central Andes and the Philippines, are spatially and temporally associated with contemporaneous adakitic magmatism. Adakite and its clan (such as high magnesian andesites (HMA), magnesian andesite (MA), Niobium-enriched basalts (NEB), and high Niobium basalts, etc.) are the host rocks of most porphyry copper deposits, and the source rocks of many epithermal An systems. Based on the present level of understanding, the genetic relationship between them may stem from the inherent natures of adakitie magmas with sufficient fluids, high oxygen fugacity and mafic source region, which are preferred for Cu, An and other deeply-sourced metals to be extracted and enriched, and finally economically mineralized. However, the reason (s) and mechanism responsible for this relationship are poorly understood in general. It is suggested that the close link of adakites with porphyry copper and epithermal gold deposits be a potential metallogenetic specialization of magmatism that necessitate in-deep assessment and relevant comparative studies among ore-bearing adakites, barren adakites and normal calc-alkaline rocks, to uncover the intrinsic and concealed story.

关 键 词：埃达克岩 斑岩铜矿 浅成热液金矿 岩浆成矿专属性 对比研究 

分 类 号：P588.142[天文地球—岩石学] P588.144[天文地球—地质学]