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首页> 外文期刊>Journal of Volcanology and Geothermal Research >~(40)Ar/~(39)Ar single crystal dates from pyroclastic deposits provide a detailed record of the 590-240 ka eruptive period at the Vulsini Volcanic District (central Italy)
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~(40)Ar/~(39)Ar single crystal dates from pyroclastic deposits provide a detailed record of the 590-240 ka eruptive period at the Vulsini Volcanic District (central Italy)

机译：〜（40）AR /〜（39）来自Pyroclastic沉积物的单晶日期，提供了Vulsini火山区（意大利中部）的590-240 kA爆发期的详细记录

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摘要

We analyze the age distribution provided by 113 sanidine crystals separated from six samples of pyroclastic products of the Bolsena-Orvieto phase of activity at the Vulsini Volcanic District, which were dated via the Ar-40/Ar-39 single crystal, total fusion method in a previous study.Moreover, we investigate the compositional and depositional features of the dated products, both at the outcrop scale and at the optical microscope, aimed at discriminating the juvenile vs. antecrystic vs. xenocrystic origin of the dated crystals. Results of this study provide insights on the magmatic process preceding the eruptions, as well as on the eruptive mechanisms of the primary deposits. The data also provide a geochronologic context to the history of eruptive activity of the Vulsini Volcanic District, from 590 to 250 ka with greater detail than previously outlined by direct dating of several primary units. Indeed, most of the six samples analyzed in the present work yielded 19 distinct crystal population ages, 10 of which match those of previously dated eruptive units and the other 9 possibly corresponding to primary deposits so far undated. (C) 2020 Elsevier B.V. All rights reserved.
机译：我们分析了由佛西尼火山区的血管内火山区的六个样品分离出来的113种凝血水晶的年龄分布，该地区通过AR-40 / AR-39单晶，全融合方法先前的研究。我们研究了在露天度和光学显微镜处的日期产品的组成和沉积特征，旨在辨别少年与乳酸的抗丁烯型抗果蝇的晶体。本研究的结果为爆发前的岩石过程提供了见解，以及原发性沉积物的喷发机制。该数据还为佛武里火山区的喷发活动历史提供了地理学背景，从590到250 kA，比以前通过直接约会的几个主要单位概述的细节更详细。实际上，在本作工作中分析的六个样品中的大多数样品产生了19个不同的晶体群，其中10岁，其中10个符合先前日期的喷发单元，另一个可能与原发性沉积物相对应的其他9。 （c）2020 Elsevier B.v.保留所有权利。

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