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首页> 外文期刊>Geochemistry, geophysics, geosystems >The carbon-isotope signature of ultramafic xenoliths from the Hyblean Plateau (southeast Sicily, Italy): Evidence of mantle heterogeneity
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The carbon-isotope signature of ultramafic xenoliths from the Hyblean Plateau (southeast Sicily, Italy): Evidence of mantle heterogeneity

机译：Hyblean高原（意大利西西里东南部）超镁铁质异岩的碳同位素特征：地幔非均质性的证据

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摘要

We investigated the carbon isotope composition of mantle source beneath the Hyblean Plateau (southeast Sicily, Italy) by studying CO2 in fluid inclusions from ultramafic xenoliths recovered in some Miocene diatremes. In order to constrain the processes influencing the isotopic marker of carbon we combined C-13(CO2) results with information about noble gases (He and Ar) obtained in a previous investigation of the same products. Although Ar/CO2 and He/Ar ratios provide evidence of Rayleigh-type fractional degassing, the isotopic geochemistry of carbon is poorly influenced by this process. Mixing related to metasomatic processes where MORB-type pyroxenitic melts permeate a peridotite mantle probably contaminated by crustal fluids inherited from a fossil subduction can explain the measured C-13 and CO2/He-3 variations, ranging from -4 to -2 and from 10(9) to 10(10), respectively. Simple mass-balance calculations highlighted that the Hyblean peridotite source was mainly contaminated by the carbonate source, being carbonate and organic matter present at a ratio that varied within the range from 7:1 to 4:1.
机译：我们通过研究某些中新世超自然界的超镁铁质异质岩中流体包裹体中的CO2，研究了Hyblean高原（意大利西西里东南部）下地幔源的碳同位素组成。为了限制影响碳同位素标记的过程，我们将C-13（CO2）结果与先前对相同产品的研究中获得的有关稀有气体（He和Ar）的信息结合在一起。尽管Ar / CO2和He / Ar比率提供了瑞利型部分脱气的证据，但是碳的同位素地球化学受此过程影响很小。与交代过程有关的混合，在这种混合过程中，MORB型高铁镍矿熔体渗透到了可能被化石俯冲所继承的地壳流体污染的橄榄岩地幔中，这可以解释测得的C-13和CO2 / He-3变化，范围从-4到-2和从10 （9）至10（10）。简单的质量平衡计算结果表明，Hyblean橄榄岩源主要受到碳酸盐源的污染，碳酸盐和有机物的比例在7：1至4：1范围内变化。

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