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首页> 外文期刊>Contributions to Mineralogy and Petrology >Mantle and crustal processes in the magmatism of the Campania region: inferences from mineralogy, geochemistry, and Sr–Nd–O isotopes of young hybrid volcanics of the Ischia island (South Italy)
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Mantle and crustal processes in the magmatism of the Campania region: inferences from mineralogy, geochemistry, and Sr–Nd–O isotopes of young hybrid volcanics of the Ischia island (South Italy)

机译：坎帕尼亚地区岩浆作用的地幔和地壳过程：来自伊斯基亚岛（意大利南部）年轻混合火山的矿物学，地球化学和Sr-Nd-O同位素的推断

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摘要

Ischia, one active volcano of the Phlegraean Volcanic District, prone to very high risk, is dominated by a caldera formed 55 ka BP, followed by resurgence of the collapsed area. Over the past 3 ka, the activity extruded evolved potassic magmas; only a few low-energy explosive events were fed by less evolved magmas. A geochemical and Sr–Nd–O isotope investigation has been performed on minerals and glass from products of three of such eruptions, Molara, Vateliero, and Cava Nocelle (<2.6 ka BP). Data document strong mineralogical, geochemical, and isotopic heterogeneities likely resulting from mingling/mixing processes among mafic and felsic magmas that already fed the Ischia volcanism in the past. Detailed study on the most mafic magma has permitted to investigate its origin. The mantle sector below Ischia underwent subduction processes that modified its pristine chemical, isotopic, and redox conditions by addition of ≤1 % of sediment fluids/melts. Similar processes occurred from Southeast to Northwest along the Apennine compressive margin, with addition of up to 2.5 % of sediment-derived material. This is shown by volcanics with poorly variable, typical δ18O mantle values, and 87Sr/86Sr progressively increasing toward typical continental crust values. Multiple partial melting of this modified mantle generated distinct primary magmas that occasionally assimilated continental crust, acquiring more 18O than 87Sr. At Ischia, 7 % of Hercynian granodiorite assimilation produced isotopically distinct, K-basaltic to latitic magmas. A SW–NE regional tectonic structure gave these magmas coming from large depth the opportunity to mingle/mix with felsic magmas stagnating in shallower reservoirs, eventually triggering explosive eruptions.
机译：伊斯基亚（Ischia）是白玉岩火山区的一座活火山，极易发生高风险，其主要特点是形成的55 ka BP破火山口，然后是塌陷区的复活。在过去的3 ka中，该活动挤出了钾盐岩浆;只有少数低能爆炸事件是由演化较少的岩浆提供的。地球化学和Sr-Nd-O同位素研究已经从三种火山爆发的产物，莫拉拉火山，瓦特里罗火山和卡瓦诺切勒（<2.6ka BP）的矿物和玻璃中进行了研究。数据记录了强烈的矿物学，地球化学和同位素异质性，这很可能是由于过去已经给伊斯基亚火山岩供食的镁铁质岩浆岩和长英质岩浆岩之间的混合/混合过程造成的。对最镁铁质岩浆的详细研究已允许调查其成因。坐骨下方的地幔扇面经历了俯冲过程，通过添加≤1％的沉积物流体/熔体来改变其原始化学，同位素和氧化还原条件。从东南到西北沿亚平宁压限发生了类似的过程，增加了高达2.5％的沉积物衍生物质。这表现为火山岩的可变性差，典型的δ18O地幔值，而87Sr / 86Sr逐渐向典型的陆壳值增加。这种修饰地幔的多次部分熔融产生了独特的原生岩浆，这些岩浆有时会吸收大陆壳，比87Sr获得更多的18O。在伊斯基亚，海西花岗闪长岩同化的7％产生了同位素不同的，从K玄武岩到岩浆岩浆。 SW-NE区域构造构造使这些岩浆从深处进入，有机会与滞留在较浅储层中的长英质岩浆混合/混合，最终引发爆发性喷发。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2013年第6期|1173-1194|共22页
  • 作者

    Massimo D’Antonio; Sonia Tonarini; Ilenia Arienzo; Lucia Civetta; Luigi Dallai; Roberto Moretti; Giovanni Orsi; Mariachiara Andria; Alberto Trecalli;

  • 作者单位

    Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse Università degli Studi di Napoli Federico II">(1);

    Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli Osservatorio Vesuviano">(2);

    Consiglio Nazionale delle Ricerche Istituto di Geoscienze e Georisorse">(3);

    Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli Osservatorio Vesuviano">(2);

    Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse Università degli Studi di Napoli Federico II">(1);

    Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli Osservatorio Vesuviano">(2);

    Consiglio Nazionale delle Ricerche Istituto di Geoscienze e Georisorse">(3);

    Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli Osservatorio Vesuviano">(2);

    Dipartimento di Ingegneria Civile Seconda Università degli Studi di Napoli">(5);

    Istituto Nazionale di Geofisica e Vulcanologia sezione di Napoli Osservatorio Vesuviano">(2);

    Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse Università degli Studi di Napoli Federico II">(1);

    Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse Università degli Studi di Napoli Federico II">(1);

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  • 正文语种 eng
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  • 关键词

    Ischia; Mineral chemistry; Isotope geochemistry; Mingling/mixing; Mantle enrichment/crustal contamination; Oxidizing fluids;

    机译：伊斯基亚矿物化学;同位素地球化学;混合/混合;地幔富集/地壳污染;氧化液;

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