【摘要】 瓮安动物化石群是目前已知的最古老的多细胞动物化石群,其为代表的微体化石有很多重要的科学内涵有待揭示。然而,无损高分辨3D成像方法的缺少长期制约着对微体化石的深入研究。同步辐射硬X射线相衬显微断层成像(PC-SR-μCT)具有高穿透性、高空间分辨率、高密度分辨率等优点。通过几年来的跨领域国际合作研究,我们发现PC-SR-μCT非常适合无损高空间分辨率研究微体古生物化石的3D结构,是微体化石研究的理想新手段。首先介绍PC-SR-μCT方法及其在微体化石无损研究中的相关方法学,然后简介近几年PC-SR-μCT在瓮安动物群微体化石研究中取得的主要成果。更多还原

【Abstract】 The Weng’an fossil fauna from Precambrian Doushantuo phosphates in Weng’an, China, have attracted great attention as the oldest fossil evidence yet found for multicellular animal life on Earth. There are rich important scientific connotations among the Weng’an Fauna fossils as a representative of the micron fossils. However, the potential of the micron fossil fauna has not been fully realized because of the scarcity of the high resolution nondestructive 3D methods. Phase-contrast based synchrotron radiation X-ray microtomography(PC-SR-μCT) has the advantages of high penetrability, high spatial resolution and high electron density resolution. In this paper, we present the methodology of the PC-SR-μCT and its application in micron fossil investigation, including the related methodology, the main scientific achievements and the problems to be resolved. PC-SR-μCT is an ideal tool to investigate the 3D structure of the micron fossils nondestructively.更多还原