摘要
成矿元素丰度是岩浆岩成矿的物质基础,而成矿元素富集指数(R′)则是判别岩浆岩是否成矿的最佳定性指标。笔者统计了国内外843个岩体的R′值,其中成矿母岩体的R’值多为3—100,高者达400以上;非成矿岩体的R′值多小于3。本文用R′值同全铁、全碱三项指标设计成RKF三角图,可有效地判别各类岩浆岩的成矿性。
Based on the enrichment factor (R') of ore-forming elements and K'(K_2O + Na_2O) andF' (Fe_2O_3 - FeO) as three petrochemical parameters, a triangular diagram has been estab-lished, by which the mineralization potential would be effectively ascertained of granitoid rocks,basic ultrabasic rocks and effusive rocks. In the triangular diagram, the closer to the R-cor-ner the data points are, the higher the mineralization potential will be. The enrichment factorof ore-forming elements is an arithmatical mean value of the bulk clarke concentrations ofmetallogenetic elements related with the metallogenetic specialization of magmatic rocks. Thestatistic data from 843 magmatic rock bodies show that the R' values vary generally from 3to 100, even up to 1000 in a few cases, for the metallogenetic parent rocks, whereas the R' va-lues are <3 in most cases for non-metallogenetic rock bodies.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第1期68-79,共12页
Geochimica
