摘要
本文以瑞利结晶、批式熔融、分离熔融和混合作用四种主要的微量元素模型为基础,建立了对应于这些岩浆作用的一套以元素比值-比值(或元素)、共分母元素比值-比值、共分子元素比值-比值和元素-元素作变量的数学方程及相应的成分变异曲线图。在分析一套有成因联系的岩石的形成机理时,只要将岩石成分投点成有关的变异图,并与本文的成分变异曲线图对比,就能快速确定岩石的成分变异主要受何种岩浆过程控制。若计算出元素的总分配系数,就可确定源岩、初始岩浆、端员岩浆或混染物的成分。
Based on the four major trace-element models for Raileigh crystallization,batch melting,fractional melting and mixing,a set of mathematical equations and their relevant covariancepatterns have been established for the magmatic processes in the element ratio-ratio(orelement),co-numerator element ratioratio,co-denominator element ratio-ratio,and element-ele-ment systems.The study suggests that the compositional variations of the related magmas,asshown on the covariance patterns designed in this paper,are expressed by easily distinguishedexponential(?)curves,hyperbolae,or straight lines,and their forms depend only on the type of amagmatic process,and not on the bulk distribution coefficients of the elements(D),the com-position of the sourcerock or magma(C),or the fraction of liquid(F)in the system.In theanalysis of petrogenetic mechanisms of related rocks,one can rapidly and effectively determinewhether the compositional variations of the rocks are related with either Raileigh crystallization,batch melting,fractional melting or mixing(or contamination by country rocks)so long asthe data of the rocks are plotted on the relevantvariation diagrams and compared with the cova-riance patterns in the present paper.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第2期115-126,共12页
Geochimica
基金
地质行业科学技术发展基金资助
