| 埃达克岩研究现状 |
| |
| 引用本文： | 孙宏伟,王海坡,张炯飞.埃达克岩研究现状[J].地质与资源,2003,12(1):61-63. |
| |
| 作者姓名： | 孙宏伟 王海坡 张炯飞 |
| |
| 作者单位： | 1. 内蒙古地矿局第六勘查院, 内蒙古 扎兰屯 162650;2. 沈阳地质矿产研究所, 辽宁 沈阳 110033 |
| |
| 摘 要： | 埃达克岩是一套钙碱系列岩浆岩,其主要地球化学特征为SiO2 ≥ 56%,Al2O3 ≥ 15%,MgO通常小于3%,低重稀土元素和Y(Y ≤ 18×10-6,Yb ≤ 1.9×10-6),高Sr(多数大于400×10-6),无Eu异常或有轻微的负Eu异常,其成因主要有两类,一种为由俯冲板片的熔融形成,另一种由底侵玄武质下地壳熔融形成,埃达克岩具有重要的成矿意义。
|
| 关 键 词： | 埃达克岩 板片熔融 下地壳熔融 成矿意义 |
| 文章编号： | 1671-1947(2003)01-0061-03 |
| 收稿时间： | 2003-01-09 |
| 修稿时间： | 2003年1月9日 |
A REVIEW ON ADAKITE |
| |
| SUN Hong-wei,WANG Hai-po,ZHANG Jiong-fei.A REVIEW ON ADAKITE[J].Geology and Resources,2003,12(1):61-63. |
| |
| Authors: | SUN Hong-wei WANG Hai-po ZHANG Jiong-fei |
| |
| Institution: | 1. Bureau of Geological Exploration and Mineral Development, Inner Mongolia 162650, China;2. Shenyang Institute of. Geology and Mineral Resources, Shenyang 110033, China |
| |
| Abstract: | Adakite was proposed over a decade ago. It is a kind of acid-intermediate and calc-alkaline igneous rock, with the stickup characteristics of SiO2≥56%, A12O3≥ 15%, relatively depletive HREE and Y(Y≤18 × 10-6, Yb≤ 1. 9 × 10-6), high ST(> 400 × 10-6), La/Yb and Sr/Y, as well as positive Sr anomaly but absent or slightly negative Eu anomaly. There are two types of adakites with different petrogenesis: one is formed by the melting of subducting young(≤S25 -30 Ma) slab, and the other is formed by the partially melting of basaltic lower crust under the continental accretion setting. Adakites are important indicators of ore deposits. |
| |
| Keywords: | adakite slab melting lower crustal melting mineralization |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质与资源》浏览原始摘要信息 |
| 点击此处可从《地质与资源》下载免费的PDF全文 |
|
