【作者】 陈虹羽； 邹欣庆； 丁勇成； 王颖； 傅光翮； 袁峰；

【Author】 Hongyu Chen;Xinqing Zou;Yongcheng Ding;Ying Wang;Guanghe Fu;Feng Yuan;School of Geography and Ocean Sciences, Nanjing University;Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University;Collaborative Innovation Center of South China Sea Studies, Nanjing University;

【机构】 南京大学地理与海洋科学学院； 南京大学海岸与海岛开发教育部重点实验室； 南京大学中国南海研究协同创新中心；

【摘要】 微塑料作为一种新兴污染物广泛存在于各种环境介质中,并构成了人新世地质记录中重要的"技术化石"。然而,对沉积记录中微塑料的年代学特征的研究仍然有限。本研究回顾了全球沉积岩芯中的测年方法、微塑料丰度和微塑料聚合物类型特征。在汇编塑料类型的"演变"的基础上建立了沉积记录中的微塑料年代序列,人新世沉积记录的微塑料层序大致从老到新可以划分为四个微塑料组合带:(1)人造丝带,指示的沉积物年代范围是1910年后;(2)微塑料复合带,指示1930年后的沉积年代;(3)聚丙烯(PP)和/或聚苯乙烯(PS)泡沫带,指示1950年后的沉积年代;(4)聚对苯二甲酸乙二醇酯(PET)碎片带,指示的年代范围是1970年后。使用收集岩芯中的微塑料类型对其沉积年龄进行框定,发现塑料类型指示的年代范围与文献使用传统测年方法所报告的年龄相一致,表明微塑料可用于框定百年尺度内柱状沉积物年龄。此外,微塑料在埋藏记录中能够有效保存,并难以发生垂向位移,这使得微塑料测年能够成为人新世测年的有效补充方法。更多还原

【Abstract】 Microplastics are ubiquitous in the environment, eventually becoming part of the geological record as ‘technofossils’. However, research on the chronological characteristics of microplastics remains limited. This study reviewed dating methods, microplastic abundance, and microplastic polymer type in sedimentary cores globally. Furthermore, the ‘evolution’ of plastic types was compiled in sequence, and a microplastic chronological sequence in the sedimentary record was established, which could be roughly divided into four different microplastic assemblage zones:(1) Rayon zone, indicating a sediment age of later than 1910;(2) Microplastic composite zone, referring to a sediment age of later than the 1930s;(3) PP and/or PS foam zone,referred to post-1950s;(4) PET fragments zone, referred to post-1970s. It was found that the sediment age ranges determined by microplastic type corresponded to the published dating results,indicating that microplastics could be useful for dating sedimentary cores on a centennial scale.Furthermore, good preservation and limited mobility of microplastics in burial records make microplastic dating an effective supplementary dating method for determining ages of Anthropocene sediments更多还原