漳州复式岩体主要造岩矿物稀土元素地球化学特征

The REE Geochemical Characteristics of Rock -forming Minerals of Zhangzhou Granite Batholith, Fujian Province

对漳州夏式岩体各次侵入岩主要造岩矿物稀土元素实际含量的系统研究表明，其稀土分布型式和稀土含量都具有内在规律性且随著岩浆的分升演化而发生规律性交化。Ⅰ型花岗岩和Ａ型花岗岩中造岩才物的稀土元素地球化学特点有明显区别；副矿物在岩石中虽含量较低，但其中稀土元素含量极高，因而对全岩稀土的贡献却较大，尤其是偏酸性岩石。因此在研究岩浆演化过程中稀土元素地球化学特征时，副矿物的影响不能忽视。

Zhangzhou granite batholith, located in southeast China, Fujian province, is characterized by large size and multistage and multi-pened intrusion and a co-existence of I-typeand A-type granitoids. Based on a great deal of analysis data, the REE geochemical characteristics of rock-forming minerals of various rocks have been studied. It is found that plagioclase.Alkli-feldpar and biotite have the LREE-enriched REE distribution patterns and positive Euanomaly (Except for biotite),but amphibole and pyroxene (Di and Hy) have the flatten orHREE-enriched REE distribution pattern and negative Eu anomly. It is also found that the differences of REE geochemical behavior of rock-forming minerals between I-type and A-typegranige is very dbvious. The REE contribution of major minerals to the whole-rock are in thesequence of P1>Di>Hy >Bi > Af in the I - type granite, but Bi > Af > Pl in the A - type granite. Although the amounts of accessory minerals are very low, their REE contribution to thewhole rock is rather high (for LREE it is as high as 51￣83 %, for HREE as high as 61-90%).When we study the REE geochemical behavious of acidic rocks, the influence of accessory minerals must be considered.