News Release

纤维素织物如何化石化

Peer-Reviewed Publication

Proceedings of the National Academy of Sciences

Mineralized textile fragment on the surface of a thin copper-based plate from the Nausharo site

image: Mineralized textile fragment on the surface of a thin copper-based plate from the Nausharo site (Kachi-Bolan region, Balochistan, Pakistan), dating from the first half of the 3rd millennium BC. The weaving technique, a balanced plain weave, is directly identifiable. The textile fibers show simultaneously a mineral character with various dense copper compounds and an organic signature derived from the original cellulose. view more 

Credit: Image credit: Christophe Moulhérat

一项研究探索了织物如何通过矿化作用化石化。人们对于织物在考古环境下如何化石化仍然知之甚少。埋在金属物体附近的纤维素织物能够经历一种促进保存的矿化过程,但是其基础机制仍不清楚。Lo�c Bertrand及其同事使用分析技术的组合,研究了年代测定为公元前第三个千年到第二个千年的古代织物的保存,人们发现这些织物埋在铜人工制品附近,来源于近东的挖掘以及卢浮宫的考古学收藏品。这些技术包括了二次谐波显微成像、半定量同步辐射X光微断层扫描,以及纳米尺度红外成像。这项分析发现了矿化的三个主要阶段:水把附近的金属腐蚀以及土壤溶液释放的抗微生物金属阳粒子运输到织物纤维中;这些阳粒子和溶液被吸收,导致了纤维膨胀并且形成一个无机物的外壳,导致了纤维素降解;这些纤维经历了逐渐的硅化,这涉及到含硅化合物的浓缩。这些发现为纳米尺度上的矿化过程以及它如何帮助了数千年历史的织物的保存提供了见解。这组作者说,此外,这项研究证明了包括二次谐波显微成像等成像技术能够如何帮助研究材料的保存。

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