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A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills

机译:杰克山(Jack Hills)的锆石镶嵌钻石中记录的轻碳储层

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The recent discovery of diamond-graphite inclusions in the Earth's oldest zircon grains (formed up to 4,252 Myr ago) from the Jack Hills metasediments in Western Australia provides a unique opportunity to investigate Earth's earliest known carbon reservoir. Here we report ion microprobe analyses of the carbon isotope composition of these diamond-graphite inclusions. The observed d~(13)C_(PDB) values (expressed using the PeeDee Belemnite standard) range between -5 per mil and -58 per mil with a median of -31 per mil. This extends beyond typical mantle values of around -6 per mil to values observed in metamorphic and some eclogitic diamonds that are interpreted to reflect deep subduction of low-d~(13)C_(PDB) biogenic surface carbon. Low d~(13)C_(PDB) values may also be produced by inorganic chemical reactions2, and therefore are not unambiguous evidence for life on Earth as early as 4,250 Myr ago. Regardless, our results suggest that a 1ow-d~(13)C_(Pdb) res-ervoir may have existed on the early Earth.
机译:最近在西澳大利亚州的杰克·希尔斯沉积物中发现了地球上最古老的锆石颗粒(形成于4,252迈尔之前)中的钻石-石墨夹杂物,为研究地球上最早的已知碳储层提供了独特的机会。在这里,我们报告了这些金刚石-石墨夹杂物的碳同位素组成的离子微探针分析。观察到的d〜(13)C_(PDB)值(使用PeeDee Belemnite标准表示)介于-5 / mil和-58 / mil之间,中值为-31 / mil。这超出了典型的地幔值,即每密耳-6左右,达到了在变质和一些鳞片钻石中观察到的值,这些值被解释为反映了低d〜(13)C_(PDB)生物成因表面碳的深度俯冲。低d〜(13)C_(PDB)值也可能是由无机化学反应产生的2,因此并不是早在4,250 Myr之前就存在地球生命的明确证据。无论如何,我们的研究结果表明,地球早期可能已经存在1ow-d〜(13)C_(Pdb)水库。

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