The geochemical effect of lanthanides: Its types and application for magmatic rocks—A new method to semi-quantitatively determine strength of magmatic fluid complexation and fractional crystallization
The geochemical effect of lanthanides: Its types and application for magmatic rocks—A new method to semi-quantitatively determine strength of magmatic fluid complexation and fractional crystallization
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DOI：
10.1007/s12583-014-0420-z
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发表时间：
2014-04
影响因子：
3.3
通讯作者：
Jianye Yang;Lei Zhao;Weiguo Zhang
中科院分区：
文献类型：
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作者：
Jianye Yang;Lei Zhao;Weiguo Zhang
本文研究了稀土元素的地球化学行为与离子半径的关系。根据稀土元素地球化学效应的基本规律，发现稀土元素在岩浆岩及其矿物中的赋存状态有5种类型和部分亚型，它们可能与岩浆岩的演化方式相对应。通过对新疆东部一个亚马逊-黄玉花岗岩体和渤海湾盆地下辽河坳陷新生代碱性火山-侵入岩稀土元素地球化学数据的分析表明，稀土元素地球化学效应类型Ⅱ 1、Ⅲ和Ⅳ不仅直接反映了岩浆演化过程中存在的流体络合作用和分离结晶作用，还可以半定量地测定流体络合和分离结晶的强度。因此，镧系元素的地球化学效应作为一种半定量研究岩浆岩演化的新途径是可行的。此外，利用轻稀土元素线性方程的某些参数及其离子半径所绘制的图解，可以有效地区分青海共和盆地边缘不同源区的基性熔岩。
In this paper, the relationship between rare earth elements (REEs) geochemical behavior and their ionic radii was studied. According to the basic law called the effect on geochemistry of lanthanides, five types and some of subtypes of REEs occurrence, both in magmatic rocks and their minerals, were found, which may correspond to the evolutionary way of magmatic rocks. Analysis of REEs data for an amazonite-topaz granite pluton in East Xinjiang, one of the administrative regions of West China, and Cenozoic alkaline volcanic-intrusive rocks in the Xialiaohe depression of Bohai Bay Basin, China show that types II1, III and IV of effect on geochemistry of lanthanides not only reflect fluid complexation and fractional crystallization existed in magmatic evolution directly, but also can determine semi-quantitatively the strength of fluid complexation and fractional crystallization. Therefore, the effect on geochemistry of lanthanides, a new way to study semi-quantitatively evolution of magmatic rocks, is probably practicable. Moreover, the mafic lavas of different sources from the margin of Gonghe Basin, Qinghai Province, China, can be effectively distinguished in the diagram which can be drawn with some parameters of linear equation of LREEs and its ion radius.