开放地质体系中物质迁移质量平衡计算方法介绍

地质体系的开放过程,如交代、蚀变、熔融、风化、渗透、变形等,往往伴随着显著的物质组分(元素)的活动和迁移.研究这些地质过程需要我们深入地了解发生迁移组分的种类和程度.质量平衡计算作为定量限定地质体系开放过程中物质迁入或迁出情况的重要手段,已经被广泛应用到诸多的地质问题研究中.目前,已有许多的学者建立了各种各样的质量平衡计算公式和相应的图解方法,但是这些方法的核心思想和基本原理都是一致的.因此,本文选取了目前国际上几个常用的质量平衡计算方法进行了详细地介绍.这些方法包括成分-体积图解法(Gresens,1967)、Isocon图解法(Grant,1986)、标准化Isocon图解法(Guo et al.,2009)和定量计算法.同时,作者也结合自身的研究经验和实例,对这些方法的应用范围、优缺点和注意事项做了相应地评述.通过这些介绍,希望可以帮助初学者对质量平衡计算方法的基本原理、主要思想及应用过程有一个相对全面的了解.

Introduction of mass-balance calculation method for component transfer during the opening of a geological system

The opening processes of geological systems, such as metasomatism, alteration, melting, weathering, percolation and deformation, typically lead to significant mobilization and transfer of specific components (elements). The species and transfer degree for each component are extremely important to understand the geological processes involved. As a key approach to constrain the mass gain or loss during the opening of a geological system, mass-balance calculation has been broadly applied to a series of geological processes. Till now, various mass-balance calculation formulas and corresponding diagrams have been established, however, the basic idea of these methods are totally identical. This paper presents an overview on the progress in mass-balance calculation and particularly introduces a few of important mass-balance calculation methods, including composition-volume diagram (Gresens, 1967), Isocon diagram (Grant, 1986), normalized Isocon diagram (Guo et al., 2009) and quantitative calculation method. Moreover, we also summarize the scope of application, (dis)advantages and key issues of each method mentioned above. It is expected that this work could make the beginners have an overall understanding on the principle, basic idea and application process of the mass-balance calculation.