A plot of Nb/Y against Zr/TiO2 shows that the samples fall in the trachy-andesite,rhyodacite and dacite fields.
据Nb/Y-Zr/TiO2图解,样品落入粗面安山岩和流纹英安岩/英安岩区域,表明所发现的钾质斑脱岩的原始岩浆性质为中酸性岩浆。
参考来源 - 贵州乌当地区泥盆系乌当组下部粘土岩成因的初步研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
In addition, researchers found that the magma is made of dacite, a type of rock that's a precursor to granite.
另外，研究者发现这里的岩浆的成分是英安岩而不是构成夏威夷主体的玄武岩。英安岩是花岗岩的前身。
Scientists have long believed that dacite can separate from basaltic magma to form granitic rocks. But they'd never.
科学家们一直认为英安岩可以从玄武质的岩浆中分离出来形成花岗岩，但他们从没奢望能在可操作的情况下看到这一过程。
Its genesis is related to volcanic eruption and dacite porphyry intrusion. And it has some characteristics of porphyry Cu deposit.
成因上与火山喷发、英安斑岩体侵入作用有关，具有斑岩铜矿的一些特征。
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