Abstract

This paper reports the first multidisciplinary petrologic, mineralogical, and geochemical studies of the near-crater tephra discharged by the 1669 catastrophic eruption of Etna stratovolcano, Sicily. We studied the grain-size distribution, chemical and mineral-phase composition of the tephra. We determined the composition of trace elements and the composition of encapsulated lithogenic gases. Etna is classified as an intraplate volcano with a deep-seated magma chamber. Of special importance is the fact that the Etnean products were found to contain volcanogenic organoids that have phase, elemental, and isotope compositions similar to the organoids encountered in diamond-bearing products discharged by some Kamchatka volcanoes. This corroborates out earlier inference that carbonaceous abiogenesis is ubiquitous in the conditions of onshore volcanism.

中文翻译：

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1669 年埃特纳火山、西西里喷发的火山灰：岩石学、矿物学、地球化学特性和地球动力学方面

摘要

本文报告了对西西里岛埃特纳火山 1669 年灾难性喷发排放的近火山口火山灰的首次多学科岩石学、矿物学和地球化学研究。我们研究了火山灰的粒度分布、化学和矿物相组成。我们确定了微量元素的组成和封装的成岩气体的组成。埃特纳火山被归类为具有深层岩浆房的板内火山。尤其重要的是，发现埃特尼火山产品含有火山有机体，其相、元素和同位素组成类似于堪察加半岛某些火山喷出的含金刚石产品中遇到的有机体。这证实了早先的推论，即碳质非生物发生在陆上火山作用的条件下无处不在。