蚀变作用的多原岩系统及质量平衡

介绍了造成岩石地球化学不均匀性的原因，主要有测量误差、闭合问题及岩石学方面的控制等。各有其不同的研究和解决方法。对于蚀变岩的多原岩系统，常用不相容高场强元素（HFSE）来描述岩石性质，用其作为监视器，可作出各相容元素（或成分）的分异线；用不活动元素蚀变线与分异线的产点来确定原始成分，并在此基础上进行蚀变岩质量变化的计算。

MULTIPLE PRECURSOR SYSTEMS AND MASS BALANCE OF ALTERATION

Many altered rocks in hydrothermal deposit have multiple precursors.The lithogeochemical heterogeneity in rocks are mainly due to measurement error, closure and petrological controls. There are different methods for different variations in rocks. The incompatible high field strength elements (HFSE) are used as a monitor for multiple precursor systems and for drawing a fractionation line. The intersection of the alteration and fractionation lines provides a means of identifying altered rock precursors. Consequently, this may enable the caculation of mass changes in altered rocks.