大洋玄武质岩石元素间的线性关系及其应用

批式熔融是大洋玄武质岩石形成的主要机制之一。本文建立了批式熔融作用中元素间的线性关系模型,并应用于北秦岭宽坪群变玄武质岩石化学分析资料的研究,对变异图解、相关矩阵、源区成分计算和估计等问题作了讨论。给出了一些具体应用的方法。

THE LINEAR RELATIONSHIP AMONG ELEMENTS IN OCEANIC BASALTS AND ITS APPLICATION

On the basis of batch melt model, this paper establishes the linear relationships among elements in oceanic basalts and gets the main results as follows.1) In general,the relative change scale of the slope (a) and intercept (b) of a regression line is not quitely large in the normal range ofpartial melting degrees.2) The reason why there are not good linear relationships among some elements can be explained in terms of the changes of such parameters as Fi,D and Co and the overlap of other geological processes.3) Some methods are given to calculate and estimate the contents and ratios of elements in the source region from which the basalts are generated.4) The application of the methods to the basalts of the Kuanping Group suggests that the basalts are generated from a depressed mantle source.