亲铜(亲铁)元素含量比值在地球科学中的初步应用实例  

A Brief Introduction to the Application of Elemental Ratios of Siderophile and Chalcophile Elements in Earth Sciences

作　　者：汪在聪 邹宗琪 WANG Zai-cong;ZOU Zong-qi(State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences,China University of Geosciences ( Wuhan) , Wuhan 430074, China)

机构地区：[1]中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室,武汉430074

出　　处：《矿物岩石地球化学通报》2019年第2期224-236,共13页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41722302;41673027)

摘　　要：亲铜(亲铁)元素在行星增生演化、核幔分异、地幔岩浆过程、壳幔相互作用以及金属矿床成因等领域具有举足轻重的作用。本文从亲铜元素的地球化学性质出发,介绍了"高维度思维"的亲铜元素含量比值及其在地球科学领域的初步应用:①获得同一份样品中不同亲铜元素含量可在一定程度上降低样品的不均一性(块金效应)对含量比值的影响;②Cu/Ag值可以约束不同高温岩浆过程中硫化物固液状态和亲铜元素地球化学性质,进而认识地幔、洋壳和大陆地壳间的联系;③具有不同分配系数的亲铜元素含量的比值可以鉴别岩浆硫化物饱和史,比如通过亲铜元素的分异约束火星陨石母岩浆的硫化物不饱和演化历史;④依据In-Cd-Zn在硅酸盐地球的含量以及它们的相对亲铜亲铁性质,地球主体增生物质已经消失,不能由陨石代表。Siderophile and chalcophile elements(SCEs) play decisive important roles in fields of the planetary accretion evolution, core-mantle differentiation, magmatc processes in mantle, mantle-crust interaction, and metallogenesis of ore deposits. Based on the geochemical properties of chalcophile elements, this paper has mainly introduced some application examples of the "high-dimensional thinking" elemental ratios of the SCEs in Earth Sciences:①Obtaining contents of various chalcophile elements in same one sample would reduce the effect of sample heterogeneity(‘nugget effect’) on content ratios of elements;②The Cu/Ag ratios in ultramafic/mafic rocks could be used to constrain the controlling geochemical properties of sulfide melt or crystalline sulfide on the SCEsin various high temperature magmatic processes, and then to realize the relationship among the mantle, oceanic crust, and continental crust of the Earth;③The content ratios of the SCEs with different partition coefficients can be used to identify the saturation history of magma sulfide, such as to reveal the evolution history of sulfide-unsaturated in the parental magma of Martian meteorites through the SCEs differentiation;④On the basis of the contents of In, Cd and Zn in the bulk silicate Earth and their relative siderophile and chalcophile behaviors,the Earth’s main building materials have disappeared and could not be represented by known chondritic meteorites.

关 键 词：硫化物 亲铜亲铁元素 元素比值 地幔过程 行星增生 挥发性元素 

分 类 号：P595[天文地球—地球化学]