Imaging of organic signals in individual fossil diatom frustules with nanoSIMS and Raman spectroscopy

Type Article
Date 2021-01
Language English
Author(s) Akse Shaun P1, Das Gobind2, 3, Agusti Susana2, Pichevin Laetitia4, Polerecky Lubos1, Middelburg Jack J1
Affiliation(s) 1 : Department of Earth Sciences, Utrecht University, PO Box 80021, 3508 TA Utrecht, the Netherlands
2 : Red Sea Research Center and Core Labs, King Abdullah University for Science and Technology, Thuwal, Saudi Arabia
3 : Department of Physics, Khalifa University, Abu Dhabi,, United Arab Emirates
4 : University of Edinburgh, School of Geosciences, Grant Institute, James Hutton Road, Edinburgh EH9 3FE, United Kingdom
Source Marine Chemistry (0304-4203) (Elsevier), 2021-01 , Vol. 228 , P. 103906 (6p.)
DOI 10.1016/j.marchem.2020.103906
WOS© Times Cited 3
Keyword(s) Biogenic silica, Diatom-bound organic matter, Marine sediments, NanoSIMS, Raman spectroscopy

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.

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