Abstract

Multidisciplinary petrologic, mineralogical, and geochemical studies have been carried out for the first time concerning near-crater tephra from the world-largest intraplate stratovolcano (Erebus). The volcano is characterized by a unique basanite–phonolite effusive lineage. We studied the grain-size and chemical compositions of the tephra and the concentration of trace elements in it, the mineral phase composition, lithogenic gases encapsulated in the tephra, an atomically dispersed carbonaceous substance, and the isotope composition of carbon in it. We came to the conclusion that the tephra studied here can be treated as an explosive analogue of anorthoclase lava phonolites that terminate the continuous series of magmatic differentiates known as the Erebus lineage.

中文翻译：

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基于2000年火山喷发的南极埃雷布斯火山近火山口特非拉的矿物学和地球化学性质

摘要

首次对来自世界上最大的板内平流层火山（Erebus）的近火山口特非拉进行了多学科的岩石学，矿物学和地球化学研究。火山的特征是独特的玄武岩-方钠石喷出世系。我们研究了特弗拉的晶粒大小和化学组成以及其中的微量元素浓度，矿物相组成，特弗拉封装的成石气体，原子分散的碳质物质以及其中碳的同位素组成。我们得出的结论是，此处研究的提夫拉可以看作是正石长石熔岩辉石的爆炸性类似物，它们终止了连续的一系列岩浆差异，即Erebus谱系。