TY - JOUR T1 - Imaging of organic signals in individual fossil diatom frustules with nanoSIMS and Raman spectroscopy A1 - Akse,Shaun P A1 - Das,Gobind A1 - Agusti,Susana A1 - Pichevin,Laetitia A1 - Polerecky,Lubos A1 - Middelburg,Jack J AD - Department of Earth Sciences, Utrecht University, PO Box 80021, 3508 TA Utrecht, the Netherlands AD - Red Sea Research Center and Core Labs, King Abdullah University for Science and Technology, Thuwal, Saudi Arabia AD - Department of Physics, Khalifa University, Abu Dhabi, P.box-127788, United Arab Emirates AD - University of Edinburgh, School of Geosciences, Grant Institute, James Hutton Road, Edinburgh EH9 3FE, United Kingdom UR - https://doi.org/10.1016/j.marchem.2020.103906 DO - 10.1016/j.marchem.2020.103906 KW - Biogenic silica KW - Diatom-bound organic matter KW - Marine sediments KW - NanoSIMS KW - Raman spectroscopy N2 - The organic matter occluded in the silica of fossil diatom frustules is thought to be protected from diagenesis and used for paleoceanographic reconstructions. However, the location of the organic matter within the frustule has hitherto not been identified. Here, we combined high spatial resolution imaging by nanoSIMS and Raman micro-spectroscopy to identify where the organic material is retained in cleaned fossil diatom frustules. NanoSIMS imaging revealed that organic signals were present throughout the frustule but in higher concentrations at the pore walls. Raman measurements confirmed the heterogenous presence of organics but could not, because of lower spatial resolution, resolve the spatial patterns observed by nanoSIMS. Y1 - 2021/01 PB - Elsevier JF - Marine Chemistry SN - 0304-4203 VL - 228 ID - 77508 ER -