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新西兰北部的陶波火山带中有两种类型玄武岩(高A1玄武岩与低A1玄武岩)和5种安山岩(拉长安山岩,拉长Px安山岩,Hb安山岩,Px低出Si安山岩,O1低Si安山岩).玄武岩与安山岩中的REE型式都表现为富LREE.高A1玄武岩较低A1玄武岩更富REE,其值接近于安山岩.拉长安山岩及拉长PX安山岩具Eu负异常,Hb安山岩全部具Ce负异常.据认为前者产生Eu负异常的原因在于分化过程中P1的成分发生变化,而后者产生Ce负异常的原因在于岩浆的水化作用.根据最小二乘法混合模式,拉长安山岩及拉长Px安山岩并非是从高A1武岩及低A1玄武岩中分
There are two types of basalts (high-A1 basalts and low-A1 basalts) and five kinds of andesite (andesite, elongated Px andesite, Hb andesite, Px low-Si andesite and O1 low-Si andesite) in the Taupo volcano belt in northern New Zealand. . The REE types of basalts and andesites are all characterized by LREE enrichment.The higher A1 basalts are more REE-rich than the lower basalts, and their values are close to that of andesite.The andesite and extensional PX andesite are characterized by Eu anomalies with all Hb andesite with Ce negative Abnormal .It is believed that the reason for the negative Eu anomaly is that the composition of P1 changes during the differentiation, while the latter produces negative Ce due to the hydration of magma.According to the least-squares mixing mode, Andesite is not from the high A1 rock and low A1 basalt points