Evidence for Hadean mafic intrusions in the Nuvvuagittuq Greenstone Belt, Canada

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-06-26 DOI:10.1126/science.ads8461

C. Sole, J. O’Neil, H. Rizo, J.-L. Paquette, D. Benn, J. Plakholm

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引用次数: 0

Abstract

Many questions remain regarding Earth’s earliest crust owing to the rarity of Hadean (>4.03 billion-year-old) rocks and minerals. The Nuvvuagittuq Greenstone Belt (NGB) in Canada may be the only known remnant of Hadean crust, although its age is debated, ranging from ≥3.75 to 4.3 billion years old. Mafic intrusions within this belt were specifically sampled and analyzed to investigate the timing of their magmatic differentiation. Correlations between samarium/neodymium (Sm/Nd) and ¹⁴³Nd/¹⁴⁴Nd and ¹⁴²Nd/¹⁴⁴Nd ratios correspond to ages of 4157 ± 174 and

4196_{- 81}^{+ 53}

million years for the long-lived ¹⁴⁷Sm-¹⁴³Nd and the short-lived ¹⁴⁶Sm-¹⁴²Nd systems, respectively. The age agreement between both extant and extinct radiogenic systems, in rocks related through igneous fractionation, is compelling evidence for preservation of Hadean rocks in the NGB, opening a rare window into Earth’s earliest times.

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加拿大Nuvvuagittuq绿岩带冥古宙岩浆入侵的证据

由于冥古宙（40.3亿年前）岩石和矿物的稀少，关于地球最早的地壳还有许多疑问。加拿大的Nuvvuagittuq绿岩带（NGB）可能是唯一已知的冥古宙地壳遗迹，尽管它的年龄在37.5到43亿年之间存在争议。对该带内的基性侵入岩进行了具体采样和分析，探讨了其岩浆分异的时间。钐/钕（Sm/Nd）、143nd / 144nd和142nd / 144nd的相关性分别对应于寿命较长的147sm - 143nd体系和寿命较短的146sm - 142nd体系的年龄分别为4157±174和4196−81 + 5300万年。现存和灭绝的放射性成因系统之间的年龄一致，通过火成岩分异，是NGB保存冥古宙岩石的有力证据，打开了一扇罕见的窗口，了解地球最早的时代。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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