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首页> 外文期刊>Contributions to Mineralogy and Petrology >Trace element and isotopic variations from Mt. Vulture to Campanian volcanoes: constraints for slab detachment and mantle inflow beneath southern Italy
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Trace element and isotopic variations from Mt. Vulture to Campanian volcanoes: constraints for slab detachment and mantle inflow beneath southern Italy

机译：山中微量元素和同位素的变化。坎帕尼亚火山的秃:：板块脱离和地幔流入意大利南部的限制

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摘要

New Sr–Nd–Pb isotopic ratios and trace element data for volcanic mafic rocks outcropping along a E–W transect in southern Italy, from Mt. Vulture to Neapolitan volcanoes, are reported. The variation of LILE/HFSE, HFSE/HFSE and radiogenic isotopes along this transect indicates that all of these volcanoes contain both intra-plate and subduction-related signatures, with the former decreasing from Mt. Vulture to Campanian volcanoes. New data are also reported for the Paleocene alkaline rocks from Pietre Nere (Apulia foreland), which show isotopic ratios mostly overlapping the values for Mediterranean intra-plate volcanoes as well as the Eocene–Oligocene alkaline mafic lavas from the northern Adria plate. Pietre Nere provides evidence for an OIB mantle composition of FOZO-type, free of subduction influences, that is present beneath the Adria plate (Africa) before its collision with Europe. After this collision, and formation of the southern Apennines, westward inflow of mantle from the Adria plate to the Campanian area occurred, as a consequence of slab break off. Interaction of subduction components with inflowing Adria mantle generated hybrid sources beneath the Vulture–Campania area, which can explain the compositional features of both Mt. Vulture and the Campanian mafic rocks. Therefore, mafic magmas from these volcanoes represent variable degrees of mixing between different mantle components.
机译：意大利南部从Et-W断面喷出的火山镁铁质岩石的新Sr-Nd-Pb同位素比和微量元素数据。据报道，那不勒斯火山有秃鹰。 LILE / HFSE，HFSE / HFSE和放射同位素沿该样带的变化表明，所有这些火山均具有板内和俯冲相关的特征，前者从Mt减小。秃Camp对坎帕尼亚火山。还报告了来自Pietre Nere（普利亚前陆）的古新世碱性岩石的新数据，该数据显示同位素比值大部分与地中海板内火山以及北部Adria板块的始新世-渐新世碱性镁铁质熔岩的值重叠。 Pietre Nere提供了FOZO型OIB地幔成分的证据，该成分不受俯冲影响，在与欧洲碰撞之前存在于Adria板（非洲）下方。这次碰撞和南亚平宁山脉的形成之后，由于板块的破裂，地幔从阿德里亚板块向坎帕尼亚地区向西流入。俯冲成分与流入的阿德里亚地幔的相互作用在秃鹰-坎帕尼亚地区下方产生了杂合源，这可以解释这两种山的组成特征。秃and和Campanian镁铁质岩石。因此，来自这些火山的铁镁质岩浆代表了不同地幔成分之间的混合程度。

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