The use of mineral interfaces, in sand-sized rock fragments, to infer the influence exerted by mechanical durability on the generation of siliciclastic sediments, has been determined for plutoniclastic sand. Conversely, for volcaniclastic sand, it has received much less attention, and, to our knowledge, this is the first attempt to make use of the volcaniclastic interfacial modal mineralogy of epiclastic sandy fragments, to infer mechanical durability control at a modern beach environment. Volcaniclastic sand was collected along five beaches developed on five islands, of the southern Tyrrhenian Sea (Alicudi, Filicudi, Salina, Panarea and Stromboli) from the Aeolian Archipelago, and one sample was collected near the Stromboli Island volcanic crater. Each sample was sieved and thin sectioned for petrographic analysis. The modal mineralogy of the very coarse, coarse and medium sand fractions was determined by point-counting of the interfacial boundaries discriminating 36 types of interfaces categories, both no-isomineralic and/or no iso-structural (e.g., phenocrystal/glassy groundmass or phenocrystal/microlitic groundmass boundaries) and iso-mineralic interfaces, inside volcanic lithic grains with lathwork and porphyric textures. A total of 47,386 interfacial boundaries have been counted and, the most representative series of interfaces, from the highest to the lowest preservation, can be grouped as: a) ultrastable interfaces, categorized as Pl (Plagioclase)/Glgr (Glassy groundmass) > > Px (Pyroxene)/Glgr > > Ol (Olivine)/Glgr > > Op (Opaque)/Glgr > > Hbl (Hornblende)/Glgr> > Bt (Biotite)/Glgr > > Idd (Iddingsite)/Glgr > > Rt (Rutile) / Glgr ; b) stable interfaces, categorized as Pl/Migr (Microlitic groundmass) > > Op/Migr > > Px/Migr > > Ol/Migr ; c) moderately stable interfaces, categorized as Op/Px > > Op/Hbl > > Px/P > > Ol/Pl> > Bt/Op ; and d) unstable interfaces, categorized as Pl/Pl > > Px/Px > > Ol/Ol > > Op/Op > > Hbl/Hbl > > Bt/Bt. Grains, eroded from the volcanic bedrock, if affected solely by abrasion, developed a rounded and smoothed form, with prevailing no-isostructural interfaces such as Plagioclase/Glassy groundmass, Pyroxene/Glassy groundmass and Olivine/Glassy groundmass interfaces. Grains that during transport suffered fracturing and percussion have a sharp and angular form: these combined transport mechanisms produce mainly volcanic sandy grains with iso-structural interfaces, such as Pl/Pl, Px/Px, Hbl/Hbl, and, to a lesser extent, Bt/Op and Bt/Glgr interfaces.

中文翻译：

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使用砂粒大小的火山岩碎片中的矿物界面来推断机械耐久性

已确定使用砂粒大小的岩石碎片中的矿物界面来推断机械耐久性对硅质碎屑沉积物产生的影响，已确定用于深成碎屑砂。相反，对于火山碎屑砂，它受到的关注要少得多，据我们所知，这是首次尝试利用外碎屑砂碎屑的火山碎屑界面模态矿物学来推断现代海滩环境中的机械耐久性控制。在伊奥利亚群岛的第勒尼安海南部（Alicudi、Filicudi、Salina、Panarea 和 Stromboli）的五个岛屿上开发的五个海滩上收集了火山碎屑砂，并在 Stromboli 岛火山口附近收集了一个样本。将每个样品过筛并切成薄片用于岩相分析。非常粗、粗和中砂部分的模态矿物学通过界面边界的点计数确定，区分 36 种类型的界面类别，包括非异矿物和/或非同结构（例如，表晶/玻璃质基质或表晶/微晶质基质边界）和等矿物界面，在火山岩屑颗粒内部，具有板条状和斑岩状纹理。总共计算了 47,386 个界面边界，最具代表性的界面系列，从最高到最低保存，可分为：a) 超稳定界面，分类为 Pl（斜长石）/Glgr（玻璃基体）>> Px（辉石）/Glgr > > Ol（橄榄石）/Glgr > > Op（不透明）/Glgr > > Hbl（角闪石）/Glgr> > Bt（黑云母）/Glgr > > Idd（Iddingsite）/Glgr > > Rt (金红石) / Glgr ; b) 稳定的界面，分类为 Pl/Migr（微晶质基体）> > Op/Migr > > Px/Migr > > Ol/Migr ；c) 中等稳定的界面，分类为 Op/Px > > Op/Hbl > > Px/P > > Ol/Pl> > Bt/Op ；d) 不稳定界面，分类为 Pl/Pl > > Px/Px > > Ol/Ol > > Op/Op > > Hbl/Hbl > > Bt/Bt。从火山基岩侵蚀的颗粒，如果仅受到磨损的影响，会形成圆形和平滑的形式，具有主要的非等结构界面，如斜长石/玻璃基质、辉石/玻璃基质和橄榄石/玻璃基质界面。在运输过程中受到压裂和冲击的谷物具有尖锐和有棱角的形状：