Petrology of Unusual Volcanic Glasses from the Blanco Trough, NE Pacific

这是一个对从Blanco断裂带南壁挖出的不同寻常的样品进行岩石学分析的项目。对这些岩石的镁含量的初步分析表明，它们可能代表了来自相当深部的原生液体，但铁和铝的含量分析与镁的含量并不一致。更多的数据分析，结合常量和微量元素模拟，将阐明这一不同寻常的岩套的岩石成因。通过研究从海底发现的不寻常的岩石组，可以对海底岩浆作用有很多了解。德龙博士将要研究的样本就属于这一类，因为大多数岩石样本在到达海底之前似乎都经历了一段复杂的历史。这些岩石可能直接来自于在相当深的深度熔融的源岩，这可能为了解洋壳原始源岩的性质提供了基本的见解。

This is a project to perform a petrologic analysis of an unusual sample suite dredged from the south wall of the Blanco fracture zone. Preliminary analyses of the magnesium content of these rocks indicate that they may represent primary liquids derived from considerable depth, but the analyses of iron and aluminum contents are not consistent with the magnesium content. Additional data analyses coupled with major and trace element modelling will elucidate the petrogenesis of this unusual rock suite. %%% Much can be learned about sea floor magmatic processes by studying unusual suites of rocks recovered from the sea floor. The samples to be studied by Dr. DeLong fall into that category because most rock samples appear to have undergone a complex history before arriving at the sea floor. These rocks may have been derived directly from source rocks that have melted at considerable depth and this might provide fundamental insights into the nature of primary source rocks for the oceanic crust.