Publications de Deyanira Graciela Cisneros Lazaro

Rapid isotopic exchange in mineralogically unaltered coral skeletons

Anders Meibom, Arthur Adams, Deyanira Graciela Cisneros Lazaro

Fossil coral skeletons that retain their original aragonitic mineralogy are generally considered diagenetically unaltered and reliable paleoenvironmental archives. We investigated whether oxygen isotope exchange can occur between these skeletons and ambien ...

2025

Fossil biocalcite remains open to isotopic exchange with seawater for tens of millions of years

Anders Meibom, Jaroslaw Hubert Stolarski, Stéphane Laurent Escrig, Cristina Martin Olmos, Arthur Adams, Deyanira Graciela Cisneros Lazaro

Fossilized remains of marine calcifiers constitute the physical basis for reconstructions of both deep ocean and sea-surface temperatures going back millions of years, but paleoclimate records derived from their isotope and trace-element chemistry can be b ...

Springer Nature2024

Diagenetic isotope exchange in biocalcites for paleoclimate reconstruction

Deyanira Graciela Cisneros Lazaro

The oxygen isotope compositions of fossil biocalcites, such as foraminifera, bivalves, brachiopods, and belemnites have allowed for reconstructions of sea surface and deep ocean temperatures throughout the Phanerozoic and constitute the most important reco ...

EPFL2024

Rapid grain boundary diffusion in foraminifera tests biases paleotemperature records

Anders Meibom, Jaroslaw Hubert Stolarski, Arthur Adams, Deyanira Graciela Cisneros Lazaro, Jinming Guo, Lukas Baumgartner

The paleoseawater temperature record from the oxygen isotope compositions of fossil foraminifera tests may be biased by up to about 1 degrees C due to grain-boundary diffusion alone, according to isotope exchange experiments on foraminifera tests. The oxyg ...

2023

Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent

Anders Meibom, Stéphane Laurent Escrig, Arthur Adams, Deyanira Graciela Cisneros Lazaro, Jinming Guo

Oxygen isotope compositions of fossil foraminifera tests are commonly used proxies for ocean paleotemperatures, with reconstructions spanning the last 112 million years. However, the isotopic composition of these calcitic tests can be substantially altered ...

Nature Portfolio2022

A Reassessment of of the geochemical and isotopic fidelity of biogenic carbonates

Anders Meibom, Jaroslaw Hubert Stolarski, Arthur Adams, Deyanira Graciela Cisneros Lazaro, Jinming Guo, Tarek Axel Vennemann

Oxygen isotope compositions of calcite foraminifera tests are considered to be a robust palaeotemperature proxy at earth-surface conditions, where diffusion is slow. Recrystallization of tests during diagenesis may be optically identified and is often the ...

2019

SIMS investigations of recrystallisation of and diffusion in carbonate at low and high temperature

Anders Meibom, Jaroslaw Hubert Stolarski, Arthur Adams, Deyanira Graciela Cisneros Lazaro, Jinming Guo, Lukas Baumgartner

2019