摘要
T. F. W.巴尔特计算法是一种用来研究岩石交代蚀变前后化学成分变化的常见方法,在蚀变岩石和蚀变矿床的研究中有较为广泛的应用。本文作者针对实际应用中的一些具体地质条件,着重对交代蚀变前后岩石密度发生变化时的计算应用,提出了修正意见,并对计算方法做了进一步的推导和介绍。在自然界,岩石交代作用后可以导致岩石密度的变大或变小,如果仍然按照巴尔特的方法进行计算,势必会夸大或缩小元素的带入和输出量,造成计算上的错误。因此,必须通过“单位晶胞”体积校正,使蚀变交代后的岩石和原岩在等体积“晶胞”间进行对比,方能使计算结果更加符合实际,达到预期的效果。
T. F. W. Barth calculating method is a common one which is used for studying the chemical composition changes of rocks which will undergo metasomatism-alteration before and after. It is extensively applied to the study of altered rocks and minerals. The auther of this paper puts foreward several amendment for Barth calculating method in the light of some concrete geologic condisions in practical application, especilly the change of rock density before and after metasomatism—alteration, moreover calculates and introduces further for this calculating method. If we use Barth method for calculating regardless of the change of rock density after alteration, we must exaggerate or reduce the output and input of elements and make mistakes in calculations. A more useful and desired calculating result must be from the contrast of equal volume 'cell' between the altered rocks and original rocks, so 'unit cell' volume correcting is very necessary.
出处
《武汉测绘科技大学学报》
CSCD
1989年第1期14-19,共6页
Geomatics and Information Science of Wuhan University