From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica
Shells of the bivalve Arctica islandica serve as high-resolution archive of past environmental conditions. Stable oxygen isotopes (δ18O) values from wellpreserved A. islandica shells are frequently used as a proxy for water temperature (and salinity). Hence, this species may improve distinctly our u...
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ftawi:oai:epic.awi.de:39130 2024-09-15T17:54:27+00:00 From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica Beierlein, Lars Nehrke, Gernot Schöne, Bernd R. Bickert, Thorsten Mackensen, Andreas Brey, Thomas 2015-11 application/pdf https://epic.awi.de/id/eprint/39130/ https://epic.awi.de/id/eprint/39130/1/Beierlein_GSA2015_3.pdf https://hdl.handle.net/10013/epic.46360 https://hdl.handle.net/10013/epic.46360.d001 unknown https://epic.awi.de/id/eprint/39130/1/Beierlein_GSA2015_3.pdf https://hdl.handle.net/10013/epic.46360.d001 Beierlein, L. , Nehrke, G. orcid:0000-0002-2851-3049 , Schöne, B. R. , Bickert, T. , Mackensen, A. orcid:0000-0002-5024-4455 and Brey, T. orcid:0000-0002-6345-2851 (2015) From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica , Geological Society of America Annual Meeting, Baltimore, Maryland, USA, 1 November 2015 - 4 November 2015 . hdl:10013/epic.46360 EPIC3Geological Society of America Annual Meeting, Baltimore, Maryland, USA, 2015-11-01-2015-11-04 Conference notRev 2015 ftawi 2024-06-24T04:13:16Z Shells of the bivalve Arctica islandica serve as high-resolution archive of past environmental conditions. Stable oxygen isotopes (δ18O) values from wellpreserved A. islandica shells are frequently used as a proxy for water temperature (and salinity). Hence, this species may improve distinctly our understanding of seasonal temperature dynamics in the past. We present the first stable isotope (δ18O & δ13C) analysis on a fossil semi-recrystallized A. islandica shell from the Tjörnes Beds of Iceland (Pliocene). Confocal Raman microscopy is used to identify areas of pristine aragonite and recrystallized calcite shell, which were then sampled by highresolution micro-milling. We compare paleo-water temperatures inferred from stable oxygen isotope ratios of both recrystallized and non-recrystallized portions of the shell to highlight and discuss the impacts of taphonomic alterations on a micro-scale and its implications for paleo-environmental reconstructions. Our findings emphasize the need for careful interpretation of carbonate-based water temperature reconstructions, because small-scale diagenesis can significantly modify the original stable oxygen isotope signature and substantially distort the paleoclimatic or paleoenvironmental signals inferred thereof. Conference Object Arctica islandica Iceland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
Shells of the bivalve Arctica islandica serve as high-resolution archive of past environmental conditions. Stable oxygen isotopes (δ18O) values from wellpreserved A. islandica shells are frequently used as a proxy for water temperature (and salinity). Hence, this species may improve distinctly our understanding of seasonal temperature dynamics in the past. We present the first stable isotope (δ18O & δ13C) analysis on a fossil semi-recrystallized A. islandica shell from the Tjörnes Beds of Iceland (Pliocene). Confocal Raman microscopy is used to identify areas of pristine aragonite and recrystallized calcite shell, which were then sampled by highresolution micro-milling. We compare paleo-water temperatures inferred from stable oxygen isotope ratios of both recrystallized and non-recrystallized portions of the shell to highlight and discuss the impacts of taphonomic alterations on a micro-scale and its implications for paleo-environmental reconstructions. Our findings emphasize the need for careful interpretation of carbonate-based water temperature reconstructions, because small-scale diagenesis can significantly modify the original stable oxygen isotope signature and substantially distort the paleoclimatic or paleoenvironmental signals inferred thereof. |
format |
Conference Object |
author |
Beierlein, Lars Nehrke, Gernot Schöne, Bernd R. Bickert, Thorsten Mackensen, Andreas Brey, Thomas |
spellingShingle |
Beierlein, Lars Nehrke, Gernot Schöne, Bernd R. Bickert, Thorsten Mackensen, Andreas Brey, Thomas From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
author_facet |
Beierlein, Lars Nehrke, Gernot Schöne, Bernd R. Bickert, Thorsten Mackensen, Andreas Brey, Thomas |
author_sort |
Beierlein, Lars |
title |
From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
title_short |
From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
title_full |
From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
title_fullStr |
From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
title_full_unstemmed |
From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica |
title_sort |
from aragonite to calcite: impacts of recrystallization on stable isotope (δ18o & δ13c) composition of the bivalve bio-archive arctica islandica |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/39130/ https://epic.awi.de/id/eprint/39130/1/Beierlein_GSA2015_3.pdf https://hdl.handle.net/10013/epic.46360 https://hdl.handle.net/10013/epic.46360.d001 |
genre |
Arctica islandica Iceland |
genre_facet |
Arctica islandica Iceland |
op_source |
EPIC3Geological Society of America Annual Meeting, Baltimore, Maryland, USA, 2015-11-01-2015-11-04 |
op_relation |
https://epic.awi.de/id/eprint/39130/1/Beierlein_GSA2015_3.pdf https://hdl.handle.net/10013/epic.46360.d001 Beierlein, L. , Nehrke, G. orcid:0000-0002-2851-3049 , Schöne, B. R. , Bickert, T. , Mackensen, A. orcid:0000-0002-5024-4455 and Brey, T. orcid:0000-0002-6345-2851 (2015) From aragonite to calcite: Impacts of recrystallization on stable isotope (δ18O & δ13C) composition of the bivalve bio-archive Arctica islandica , Geological Society of America Annual Meeting, Baltimore, Maryland, USA, 1 November 2015 - 4 November 2015 . hdl:10013/epic.46360 |
_version_ |
1810430779207974912 |