Petrological, geochemical and isotopic characteristics of the lithospheric mantle beneath Sardinia (Italy) as indicated by ultramatic xenoliths enclosed in alkaline lavas

Ivana Rocco; Michele Lustrino; Vincenzo Morra; Leone Melluso

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Petrological, geochemical and isotopic characteristics of the lithospheric mantle beneath Sardinia (Italy) as indicated by ultramatic xenoliths enclosed in alkaline lavas

机译：撒在撒丁岛（意大利）下面岩石圈地幔的岩石，地球化学和同位素特征，如碱性熔岩中包裹的超生物异质岩所示

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Mantle xenoliths hosted in Miocene-Quater-nary mafic alkaline volcanic rocks from Sardinia have been investigated with electron microprobe, laser ablation microprobe-inductively coupled plasma-mass spectrometry and thermal ionization mass spectrometry techniques. The xenoliths are anhydrous clinopyroxene-poor lherzolites and harzburgites, plus very rare websterites and olivine-web-sterites. Glassy pods having thin subhedral to euhedral microlites of olivine, clinopyroxene and spinel have been found in harzburgites and websterites. Clinopyroxene shows trace element variability, with values of (La/Yb)_N ranging from sub-chondritic (0.01) to supra-chondritic (8.6). The Sr-Nd isotopic ratios of the clinopyroxenes fall mostly in the field of the European lithospheric mantle xenoliths (~(87)Sr/~(86)Sr from 0.70385 to 0.70568 and ~(143)Nd/~(144)Nd ranging from 0.512557 to 0.512953). The geochemical characteristics of the Sardinian xenoliths testify to the variable degrees of earlier partial melt extraction, followed by metasomatic modification by alkaline melts or fluids. Websterites are considered to represent small lenses or veins of cumulitic (i.e. magmatic) origin within the mantle peridotite.

机译：利用电子微探针，激光烧蚀微探针-电感耦合等离子体质谱和热电离质谱技术研究了来自撒丁岛中新世-第四纪的镁铁质碱性火山岩中的地幔异岩。异种石是无水的斜向辉石的锂铁矿和harzburgite，再加上非常稀有的纤铁矿和橄榄石纤铁矿。在harzburgite和websterites中发现了玻璃状荚膜，其具有橄榄石，clinopyroxene和尖晶石的细面下到正反面的微晶。 Clinopyroxene显示出痕量元素的变异性，（La / Yb）_N值范围从亚软骨发育期（0.01）到超软骨发育期（8.6）。斜辉石的Sr-Nd同位素比主要落在欧洲岩石圈地幔异岩（〜（87）Sr /〜（86）Sr从0.70385至0.70568和〜（143）Nd /〜（144）Nd 0.512557至0.512953）。撒丁岛异岩的地球化学特征证明了较早的部分熔体提取具有可变程度，随后被碱性熔体或流体进行交代改性。韦氏体被认为代表着地幔橄榄岩中的小晶状体或脉积岩（即岩浆）起源。

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《International Journal of Earth Sciences》 |2012年第5期|p.1111-1125|共15页
作者
Ivana Rocco; Michele Lustrino; Vincenzo Morra; Leone Melluso;
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作者单位

Dipartimento di Scienze della Terra, Universita di Napoli Federico Ⅱ, Via Mezzocannone 8, 80134 Naples, Italy;

Dipartimento di Scienze della Terra, Universita di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy CNR, Istituto di Geologia Ambientale e Geoingegneria (IGAG),c/o Dipartimento di Scienze della Terra, Universita degli Studi di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy;

Dipartimento di Scienze della Terra, Universita di Napoli Federico Ⅱ, Via Mezzocannone 8, 80134 Naples, Italy;

Dipartimento di Scienze della Terra, Universita di Napoli Federico Ⅱ, Via Mezzocannone 8, 80134 Naples, Italy;

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正文语种 eng
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关键词
lherzolite; harzburgite; websterite; trace elements in minerals; glass; metasomatism; mantle xenoliths; sardinia;

机译：锂铁矿钙锌矿韦氏石;矿物质中的微量元素;玻璃;交际主义地幔异岩撒丁岛;

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Petrological, geochemical and isotopic characteristics of the lithospheric mantle beneath Sardinia (Italy) as indicated by ultramatic xenoliths enclosed in alkaline lavas

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