Out of rock: A new look at the morphological and geochemical preservation of microfossils from the 3.46 Gyr-old Strelley Pool Formation

Out of rock: A new look at the morphological and geochemical preservation of microfossils from the 3.46 Gyr-old Strelley Pool Formation
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脱离岩石:对 3.46 吉里斯特雷池地层微化石形态和地球化学保存的新认识

DOI:
10.1016/j.precamres.2019.105472
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发表时间:
2020
影响因子:
3.8
通讯作者:
Delarue F
Delarue F
中科院分区:
地球科学2区
文献类型:
--
作者:
Delarue F

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在文献中讨论的大多数假定的太古代有机壁微体化石的生物起源仍然存在争议。在这里,我们报告的微化石组合的形态和地球化学特征,从3.46 Gyr-old Strelley池组(西澳大利亚州)分离,从而提供了一组新的数据在地球上最古老的真正的微化石。通过扫描电镜成像和元素分析、拉曼光谱和纳米二次离子质谱(NanoSIMS)相结合的方法,对孤立的微结构/微体化石进行了研究。我们确定了四种形态类型,即细丝,薄膜,球体和透镜。少数球状体、薄膜和透镜体表现出连续的细胞壁表面和高N浓度和大量的P含量(如31 P −/12 C2 −离子比所示),即异常高的形态和地球化学保存水平。除了在微体化石壁内检测到P外,还在呈现梭形形状的晶状体中的微米斑块内发现了P。这些斑块可能是孢子形成过程中形成的多磷酸盐颗粒的残留物,这反过来又表明,细胞组织在3.46 Gyr前就出现了。
The biogenicity of most of the putative Archean organic-walled microfossils discussed in the literature remains debated. Here, we report morphological and geochemical characterizations of an assemblage of microfossils isolated from the 3.46 Gyr-old Strelley Pool Formation (Western Australia), thereby providing a new set of data on the oldest authentic microfossils on Earth. Isolated microstructures/microfossils were studied by combining scanning electron microscopy imaging and elemental analyses, Raman spectroscopy and nanoscale secondary ion mass spectrometry (NanoSIMS). We identified four morphological types, namely filaments, films, spheroids and lenses. A minority of spheroids, films and lenses exhibits a continuous wall cell surface and high N concentrations and substantial P contents (as suggested by31P−/12C2−ionic ratios), i.e. exceptionally high morphological and geochemical preservation levels. In addition to the detection of P within microfossil walls, P was also found within micrometric patches in lenses exhibiting a fusiform shape. These patches may be remains of polyphosphate granules possibly formed during sporulation, suggesting, in turn, that cellular organization appeared as soon as 3.46 Gyr ago.
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