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

Shaun P. Akse; Gobind Das; Susana Agustí; Laetitia Pichevin; Lubos Polerecky; Jack J. Middelburg

doi:10.1016/j.marchem.2020.103906

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

Shaun P. Akse^*, Gobind Das, Susana Agustí, Laetitia Pichevin, Lubos Polerecky, Jack J. Middelburg

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

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.

Original language	English
Article number	103906
Pages (from-to)	1-6
Number of pages	6
Journal	Marine Chemistry
Volume	228
DOIs	https://doi.org/10.1016/j.marchem.2020.103906
Publication status	Published - 20 Jan 2021

Keywords

Biogenic silica
Diatom-bound organic matter
Marine sediments
NanoSIMS
Raman spectroscopy

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10.1016/j.marchem.2020.103906Licence: CC BY

1-s2.0-S0304420320301602-mainFinal published version, 4.88 MBLicence: CC BY

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title = "Imaging of organic signals in individual fossil diatom frustules with nanoSIMS and Raman spectroscopy",

abstract = "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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AU - Akse, Shaun P.

AU - Das, Gobind

AU - Agustí, Susana

AU - Pichevin, Laetitia

AU - Polerecky, Lubos

AU - Middelburg, Jack J.

PY - 2021/1/20

Y1 - 2021/1/20

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.

AB - 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.

KW - Biogenic silica

KW - Diatom-bound organic matter

KW - Marine sediments

KW - NanoSIMS

KW - Raman spectroscopy

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JO - Marine Chemistry

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

Abstract

Keywords

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