花岗岩类自然矿物岩石化学换算及程序设计

Petrochemical Calculation Method and VBA Program for Natural Mineral of Granitoids

花岗岩类自然矿物岩石化学换算是由我国学者朱为方和唐春景设计的针对花岗岩类的标准矿物计算方法。该方法相对于CIPW标准矿物计算做了很大的改进,突出的表现在:(1)几乎能计算出花岗岩中所有的矿物,如各类云母、角闪石、堇青石、夕线石,使标准矿物与实际矿物的组成更加接近;(2)部分矿物的化学组成(如云母、角闪石)会随主岩的成分变化而变化,能够反映这些矿物广泛的类质同象特征;(3)对过铝质花岗岩,将铝区分为四次配位和六次配位,使标准矿物组成更接近实际矿物;(4)能正确计算平时罕见的花岗岩矿物组成。本文在简单介绍花岗岩类自然矿物岩石化学换算方法的基础上,应用Excel VBA设计了一套计算机程序。经检验,程序的计算结果是正确、可靠的,同时,软件具有界面简单、使用方便的特点。

Petrochemical calculation method for natural mineral of granitoids is norm mineral calculation designed by Chinese scholars Zhu Weifang and Tang Chunjing.Compared with CIPW norm mineral calculation,this method is greatly improved as follows:(1)Almost all minerals in granitoids,such as various mica,hornblende,cordierite and sillimanite,can be calculated,which makes the composition of norm minerals closer to that of modal minerals;(2)The chemical composition of some minerals(such as mica and hornblende)will change with the composition of host rock,which can reflect the broad isomorphic characteristics of these minerals;(3)For peraluminous granites,the aluminum is divided into four-order coordination and six-order coordination,so that the norm mineral composition is closer to that of modal minerals;(4)The mineral composition of granitoids with rare minerals can also be accurately calculated.Based on a brief introduction to the geochemical calculation methods of natural minerals in granitiods,the authors have designed a set of computer program with Excel VBA.The calculation result of the program is correct and reliable after test.The software is also friendly in interface and convenient in use.