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Article

Stable Oxygen and Carbon Isotope Composition of Holocene Mytilidae from the Camarones Coast (Chubut, Argentina): Palaeoceanographic Implications

1
Centre for the Investigation of Earth Sciences (CICTERRA-CONICET), Universidad Nacional the Córdoba, Av. Velez Sarsfield 1611, X5016GCA Cordoba, Argentina
2
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy
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CIRSEC Centre For Climatic Change Impact, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
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Istituto di Geologia Ambientale e Geoingegneria, IGAG-CNR, Via Salaria km 29,300, 00015 Montelibretti, Rome, Italy
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Istituto di Geoscienze e Georisorse IGG-CNR, Via Moruzzi 1, 56100 Pisa, Italy
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Istituto Nazione di geofisica e Vulcanologia, Via della Faggiola 32, 56100 Pisa, Italy
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Istituto Nazione di geofisica e Vulcanologia, Via Vigna Murata 605, 00143 Roma, Italy
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CIRCE, Department of Environmental Sciences, Second University of Naples, Viale Lincoln, 5, 81100 Caserta, Italy
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Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Ple A. Moro 5, 00185 Roma, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3464; https://doi.org/10.3390/w12123464
Received: 27 October 2020 / Revised: 2 December 2020 / Accepted: 8 December 2020 / Published: 9 December 2020
(This article belongs to the Special Issue Climate Change and Anthropogenic Impact on Coastal Environments)
The stable isotope composition of living and of Holocene Mytilidae shells was measured in the area of Camarones (Chubut, Argentina). The most striking results were the high δ18O values measured in samples older than ca. 6.1 cal ka BP. In the younger samples, the δ18O values remained substantially stable and similar to those of living specimens. Analysis of the data revealed the possibility for this isotopic shift to be driven mainly by changes in temperature probably accompanied by minor changes in salinity, suggesting cooler seawater before 6.1 cal ka BP, with a maximum possible temperature shift of ca. 5 °C. A possible explanation of this change can be related to a northward position of the confluence zone of the Falkland and Brazilian currents. This is consistent with the data obtained in marine cores, which indicate a northerly position of the confluence in the first half of the Holocene. Our data are also in line with the changes in wind strength and position of the Southern Westerlies Wind, as reconstructed in terrestrial proxies from the Southernmost Patagonia region. View Full-Text
Keywords: Patagonian coast; mollusk shells; Falkland (Malvinas) current; Brazilian current; raised beaches; Holocene; stable isotopes Patagonian coast; mollusk shells; Falkland (Malvinas) current; Brazilian current; raised beaches; Holocene; stable isotopes
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MDPI and ACS Style

Boretto, G.; Zanchetta, G.; Consoloni, I.; Baneschi, I.; Guidi, M.; Isola, I.; Bini, M.; Ragaini, L.; Terrasi, F.; Regattieri, E.; Dallai, L. Stable Oxygen and Carbon Isotope Composition of Holocene Mytilidae from the Camarones Coast (Chubut, Argentina): Palaeoceanographic Implications. Water 2020, 12, 3464. https://doi.org/10.3390/w12123464

AMA Style

Boretto G, Zanchetta G, Consoloni I, Baneschi I, Guidi M, Isola I, Bini M, Ragaini L, Terrasi F, Regattieri E, Dallai L. Stable Oxygen and Carbon Isotope Composition of Holocene Mytilidae from the Camarones Coast (Chubut, Argentina): Palaeoceanographic Implications. Water. 2020; 12(12):3464. https://doi.org/10.3390/w12123464

Chicago/Turabian Style

Boretto, Gabriella, Giovanni Zanchetta, Ilaria Consoloni, Ilaria Baneschi, Massimo Guidi, Ilaria Isola, Monica Bini, Luca Ragaini, Filippo Terrasi, Eleonora Regattieri, and Luigi Dallai. 2020. "Stable Oxygen and Carbon Isotope Composition of Holocene Mytilidae from the Camarones Coast (Chubut, Argentina): Palaeoceanographic Implications" Water 12, no. 12: 3464. https://doi.org/10.3390/w12123464

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