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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Source and magmatic evolution inferred from geochemical and Sr-O-isotope data on hybrid lavas of Arso, the last eruption at Ischia island (Italy; 1302 AD)
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Source and magmatic evolution inferred from geochemical and Sr-O-isotope data on hybrid lavas of Arso, the last eruption at Ischia island (Italy; 1302 AD)

机译：从伊索亚岛最后一次喷发的Arso混合熔岩的地球化学和Sr-O同位素数据推论出源和岩浆演化（意大利；公元1302年）

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Geochemical and isotopic (Sr-87/Sr-86 and O-18/O-16) data have been acquired on whole rock and separated mineral samples from volcanic products of the 1302 AD Arso eruption, Ischia volcanic island (Gulf of Naples, Southern Italy), to investigate magmatic processes. Our results highlight petrographic and isotopic disequilibria between phenocrysts and their host rocks. Similar disequilibria are observed also for more mafic volcanic rocks from Ischia and in the Phlegraean Volcanic District in general. Moreover, Sr-87/Sr-86 and O-18/O-16 values suggest mixing between chemically and isotopically distinct batches of magma, and crystals cargo from an earlier magmatic phase. The radiogenic Sr isotope composition suggests that the mantle source was enriched by subduction-derived sediments. Furthermore, magmas extruded during the Arso eruption were affected by crustal contamination as suggested by high oxygen isotope ratios. Assimilation and fractional crystallization modelling of the Sr-O isotope compositions indicates that not more than similar to 7% of granodioritic rocks from the continental crust have been assimilated by a mantle-derived mafic magma. Hence the recent volcanic activity of Ischia has been fed by distinct batches of magma, variably contaminated by continental crust, that mixed during their ascent towards the surface and remobilized phenocrysts left from earlier magmatic phases. (C) 2016 Elsevier B.V. All rights reserved.
机译：已从伊斯基亚火山岛（那不勒斯湾，南部）1302年公元阿索喷发的火山产物中的完整岩石和分离的矿物样品中获取了地球化学和同位素（Sr-87 / Sr-86和O-18 / O-16）数据意大利），调查岩浆过程。我们的结果强调了隐晶及其宿主岩石之间的岩石学和同位素失衡。在来自伊斯基亚和一般在弗勒格拉斯火山区的更多镁铁质火山岩中也观察到了类似的失衡。此外，Sr-87 / Sr-86和O-18 / O-16值表明化学和同位素不同的岩浆和早期岩浆相的结晶产物之间存在混合。放射性Sr同位素组成表明地幔源富含俯冲衍生的沉积物。此外，高氧同位素比表明，在Arso喷发过程中挤出的岩浆受到地壳污染的影响。 Sr-O同位素组成的同化和分步结晶模型表明，来自地壳的花岗闪长岩已被地幔派生的镁铁质岩浆吸收了不超过7％。因此，伊斯基亚岛最近的火山活动是由不同批次的岩浆提供的，这些岩浆受到大陆壳的不同污染，这些岩浆在向地表上升过程中混合在一起，并迁移了早于岩浆阶段留下的重新结晶。 （C）2016 Elsevier B.V.保留所有权利。

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