Unconventional orthorhombic-phase graphite in Cretaceous foraminiferal fossils  

作　　者：Qingyi Sheng Yiwei Xu 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《Nano Research》2025年第4期1-9,共9页纳米研究(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.42293280 and 42472045);the Second Tibetan Plateau Scientific Expedition and Research(No.2019QZKK0706);the Natural Science Foundation of Jiangsu Province(No.BK20171102).

摘　　要：Fossils serve as faithful records and indicators of past geological events.However,accurately identifying organic remnants in these specimens remains challenging due to longterm degradation and transformation processes.In this study,we characterized Cretaceous foraminiferal fossils from different stratigraphic layers using optical microscopy,X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),and Raman spectroscopy.Our analyses reveal an unconventional orthorhombic phase of graphite in some samples,suggesting exposure to extreme conditions-such as high temperature and high pressure-during the mid-Cretaceous.These findings not only provide valuable insights into the geological history of that period but also offer a promising avenue for understanding the chemical synthesis of novel carbon materials through polymorphic transformations.

关 键 词：FORAMINIFERA ORTHORHOMBIC GRAPHITE CRETACEOUS POLYMORPH 

分 类 号：Q915[天文地球—古生物学与地层学]