摘要
岩浆岩的平均化学成分,是計算地壳内化学元素丰度(克拉克值)的基本資料,也是揭露岩浆岩演化規律的重要数据。而地壳内元素丰度的計算,又是定量地研究地球化学的一个基本問題。化学元素在地壳内的分布和迁移規律的闡明,都直接地或間接地同元素丰度計算問題的解决程度有关。为了开展区域地球化学研究,我們初步計算了我国岩浆岩主要化学成分的平均值。在工作过程中,蒙中国科学院地貭研究所、冶金工业部地貭研究所、地貭部图书館、中国科学技术大学地球化学系师生等多方面的协助,一并致謝。本文偏重求出我国各岩浆岩种类的平均化学成分及其元素含量,以便确定其常量元素之間的定量关系,并为今后确定微量元素平均含量求得某些基数。因此,按不同大地构造区和按不同成岩时代的計算,将另文討論。
In this paper 661 analyses which are selected from 1,394 analyses published in various geological literature since 1925 to 1960 are used to calculate the average chemical composition of the igneous rocks in China.Of these calculated analyses,about 67.6% occurs in platform regions and 32.4% in post-cambrian geocycline belts;whereas about 88% of which are distributed in the eastern part of China,and only about 12% in the Western part.The averages of 32 kinds of common rock species are firstly obtained by arithmatic averaging method.On the basis of these figures,the averages of five major units of rock types are estimated respectively,and also expressed in elementary compositions with weight and atomic percentages.Finally,estimates are given for the averages of igneous rocks in China as a whole by several methods.In the discussion,the writers pay attention to the chemical characteristics of evolution of rocks,the concentration clarke value of major rock types,and other problems related to the question of regional geochemistry.
作者
黎彤
僥紀龍
LI TUNG;YIO CHI-LUNG
出处
《地质学报》
1963年第3期271-280,共10页
Acta Geologica Sinica
