全球麻粒岩相地体与大陆下地壳成分模型

在出露地表的中、高压相麻粒岩地体代表下陆壳的认识基础上，建成全球麻粒岩相地体地球化学成分数据库（共１６８５套分析数据）。利用ＩＢＭ４３８１大型计算机对全部数据进行了多元变量统计分析，成功地建立了迄今为止精度最高的太古代、后太古代和全球大陆下地壳化学成分模型。

The Lower Continental Crust Composition Based on Discriminant Analysis of Global Granulite Terranes

An average chemical composition is proposed for granulite terranes of the lower continentalcrust based on a data base of 1685 analyses of granulite facies rocks.Both Archean and Post-Archeangranulites are included in the file.Discriminant analysis is used to study possible compositionaldlfferences between Archean and Post-Archean granulites.Results show no convincing differencebetween the two age groups using major elements,the REE,or a combination of K_2O,U,Th,Rb andBa,however,a combination of Cr,Ni,Zr,Nb,V and Co is promising,The main constraint is thelimited number of chemical analyses that contain all the elements of each combinations for use ofdiscriminant analysis which would permit more numerical methods of analyzing the results to beapplied.