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  Using Mg/Ca Ratios from the Limpet Patella depressa Pennant, 1777 Measured by Laser-Induced Breakdown Spectroscopy (LIBS) to Reconstruct Paleoclimate

García-Escárzaga, A., Martínez-Minchero, M., Cobo, A., Gutiérrez-Zugasti, I., Arrizabalaga, A., & Roberts, P. (2021). Using Mg/Ca Ratios from the Limpet Patella depressa Pennant, 1777 Measured by Laser-Induced Breakdown Spectroscopy (LIBS) to Reconstruct Paleoclimate. Applied Sciences, 11(7): 2959. doi:10.3390/app11072959.

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García-Escárzaga, Asier1, Author              
Martínez-Minchero, Marina, Author
Cobo, Adolfo, Author
Gutiérrez-Zugasti, Igor, Author
Arrizabalaga, Alvaro, Author
Roberts, Patrick1, Author              
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: archaeology; mesolithic; N Spain; mollusk shells; marine environment; spectroscopy
 Abstract: Measurement of the elemental composition of shells is increasingly emerging as an avenue for obtaining high-resolution insights into paleoclimate and past seasonality. Several studies have shown significant correlations between Mg/Ca ratios measured on shell carbonate and the sea surface temperature (SST) within which this carbonate was precipitated. However, other investigations have reported large variability in this relationship between species. Therefore, further studies, including taxa previously not considered are still required in order to validate these new species as suitable climate proxies. Here, we measured Mg/Ca ratios for limpet Patella depressa Pennant, 1777 samples live-collected in northern Spain for the first time. The elemental ratio was measured using laser-induced breakdown spectroscopy (LIBS), a technique that significantly decreases the time required for sample preparation and increases the number of shells that can be analyzed. In this study, calibration-free LIBS (CF-LIBS) methods were applied to estimate molar concentrations of chemical elements on biogenic calcium carbonate. The Mg/Ca ratio evolution along the shell growth axis was compared with stable oxygen isotope (δ18O) profiles obtained from these same limpets and the SST at the place where the mollusk grew to determine if the sequences obtained correctly reflected environmental conditions during the life-span of the mollusk. The results showed a significant correlation between Mg/Ca ratio series and both δ18O profiles and SST, highlighting the paleoenvironmental and archaeological potential of LIBS analyses on this mollusk species that is frequently found in archaeological contexts in the western Europe.

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Language(s): eng - English
 Dates: 2021-03-25
 Publication Status: Published online
 Pages: 17
 Publishing info: -
 Table of Contents: 1. Introduction
2. Materials and Methods
2.1. Modern Shells and Sea Surface Temperature (SST)
2.2. LIBS Experimental Set-Up
2.3. Shell Sample Preparation and Mg/Ca Ratio Analysis
2.4. Elemental Spectra Processing and Mg/Ca Ratio (mmol/mol) Calculation
3. Results
3.1. Estimation of Mg/Ca Ratio by CF-LIBS
3.2. Mg/Ca Ratio Series vs d18Oshell Profiles and Instrumental SST (Tmeas)
3.3. Sea Surface Temperature Reconstruction and Paleoclimate Implications
3.4. P. depressa Season of Collection and Archaeological Implications
4. Conclusions
 Rev. Type: Peer
 Identifiers: DOI: 10.3390/app11072959
Other: shh2878
 Degree: -

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Title: Applied Sciences
Source Genre: Journal
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Publ. Info: Basel, Schweiz : MDPI
Pages: - Volume / Issue: 11 (7) Sequence Number: 2959 Start / End Page: - Identifier: ISSN: 2076-3417
CoNE: https://pure.mpg.de/cone/journals/resource/2076-3417