为避免或减少目前物质来源分析中难以避免的主观性和片面性,有必要使物质来源分析向系统化、标准化、定量化发展。物质来源分析的依据不止一种,方法各异。对它们的标准化和定量化只能逐一研究,最终实现系统化。本文仅就其中之一进行讨论。由矿物鉴定获得的矿物组合(特别是重矿物组合)是物质来源分析中一种常用的依据。它和绝大多数的依据一样,只能是分析物质来源的必要依据,而不是充分依据。

A mineral association has been named the daughter group and its original materials(meterial source) have been named mother group,the later can consist of a single material,i.e.a single material source,or of several meterial sources in a certain propotion,i.e.compound material source.Generally,the minerals contained in daughter group must appear in mother group, but minerals that were not contained in daughter group must not appear. Quantitatively,the proportation of various minerals in daughter group should be approximately similar to one in mother group. According to the rule stated above,by means of fuzzy mathematics the author gives out a mathematical model based on actual mineral species and quatity,in order to calculate possibility that this mineral association originates from another mineral association.Taking the West Talimu Basin as an example,the paper discusses the .practicl of this effect of model.