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首页> 外文期刊>Annals Of Geophysics >Trachy-phonolite lava pebbles used in the ancient settlement of Oplontis (Torre Annunziata, Naples): petrochimical data supporting the origin from an old effusive activity of the Somma-Vesuvius volcano
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Trachy-phonolite lava pebbles used in the ancient settlement of Oplontis (Torre Annunziata, Naples): petrochimical data supporting the origin from an old effusive activity of the Somma-Vesuvius volcano

机译：Trachy-phonolite熔岩卵石用于Oplontis的古代定居点（Torre Annunziata，那不勒斯）：石油化学数据支持索马-维苏威火山的旧喷发性活动的起源

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In the southern and south-eastern sectors of Somma-Vesuvius volcano (Campania region, southern Italy), archaeological sites covered by the deposits of A.D. 79 Vesuvius eruption, and dating back to Protohistoric and Roman periods are characterized by the presence of numerous lava pebbles used in the human settlements. In this work we present the new case study of the lava samples found with other materials used in building foundations of the Roman site of? Oplontis (the “ Villa of Poppea” or “Villa A” or? Oplontis A ; and the ancient commercial structure of Oplontis B ). This new data set of lava pebbles of different lithologies was also compared with that of the archaeological site of Longola, in order to unravel the source provenance from distinct evolutionary phase of the Somma-Vesuvius volcano. According to major and trace elements composition, lava pebbles are all compatible with the Somma-Vesuvius magmas erupted before 8 ka BP and are represented, according to modal mineralogy and whole-rock geochemistry, by two groups belonging to the slightly silica undersaturated series: several basic-intermediate lithotypes (mainly phonolitic tephrites to basaltic trachyandesites) and trachy-phonolites . Despite the obvious abundance of volcanic rock pebbles, as the settlements were built on the Somma-Vesuvius volcano, the trachy-phonolite lava pebbles do not match with any lithostratigraphic units mapped in the up-to-now available literature data. Nevertheless, the trachy-phonolite lava pebbles show (i) a comagmatic relationships with the products erupted by Somma-Vesuvius before 8 ka BP as pyroclastic products (i.e. pumices) and (ii) a good petrological affinity with lava trachyte ejecta included within the Plinian eruptions preceding the A.D. 79 event.? The basic-intermediate and the trachy-phonolite lava pebbles from both the sites of? Oplontis and Longola, have to be interpreted as an old effusive activity of the Somma-Vesuvius. In order to form lava pebbles, reworking could have taken place both on the original lava flows/autoclastic breccias or the lithic lava fragments of pyroclastic/breccia deposits produced by the explosive events preceding the A.D. 79 eruption. ? ? ?
机译：在Somma-Vesuvius火山的南部和东南部（意大利南部坎帕尼亚地区），维苏威火山喷发的沉积物所覆盖的考古遗址可追溯到原始历史时期和罗马时期，其特征是存在许多熔岩卵石用于人类住区。在这项工作中，我们介绍了熔岩样品的新案例研究，该熔岩样品与其他材料一起用于罗马遗址的基础。 Oplontis（“ Poppea别墅”或“ Villa A”或Oplontis A;以及Oplontis B的古老商业结构）。还将不同岩性的熔岩卵石的这一新数据集与Longola考古现场的数据集进行了比较，以揭示索马-维苏威火山的不同演化阶段的物源。根据主要和微量元素的组成，熔岩卵石均与8 ka BP之前爆发的索马-维苏威岩浆相容，并且根据模态矿物学和全岩石地球化学，熔岩卵石由略为二氧化硅欠饱和系列的两组代表：基本中型岩性（主要是硬陶质辉长岩到玄武质钙锰铁矿）和钙镁长石。尽管火山岩卵石明显丰富，但由于定居点建在索马-维苏威火山上，因此，曲风-辉石熔岩卵石与最新可用文献数据中映射的任何岩石地层学单元都不匹配。然而，曲风-火山岩熔岩卵石显示（i）与索马-维苏威火山在8 ka BP之前以火山碎屑产物喷出的产物（即浮岩）具有共晶关系，并且（ii）与Plinian中包含的熔岩曲奇喷出物具有良好的岩石学亲和力在AD 79事件之前爆发。来自这两个地点的碱性-中级和松露-风沸石熔岩卵石？ Oplontis和Longola，必须被解释为索马-维苏威火山的一种古老的喷发性活动。为了形成熔岩卵石，可能在原始的熔岩流/自碎角砾岩或公元79年爆发前爆发性事件产生的火山碎屑/角砾岩沉积的岩溶熔岩碎片上进行了返工。 ？ ？ ？

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