Proxy calibrations in the cold-water coral Desmophyllum dianthus

Proxy calibrations in the cold-water coral Desmophyllum dianthus

Goldschmidt Virtual Conference, 4-9 July 2021

Saved in:
Bibliographic Details
Main Authors: Ko, Stanley, Sherrell, Robert M., Martínez-Dios, Ariadna, Lucas, Arturo, Calvo, Eva María, Pelejero, Carles
Format: comunicación de congreso biblioteca
Published: 2021-07-04
Online Access:http://hdl.handle.net/10261/275104
Tags: Add Tag
No Tags, Be the first to tag this record!
id dig-icm-es-10261-275104
record_format koha
spelling dig-icm-es-10261-2751042022-07-08T09:05:12Z Proxy calibrations in the cold-water coral Desmophyllum dianthus Ko, Stanley Sherrell, Robert M. Martínez-Dios, Ariadna Lucas, Arturo Calvo, Eva María Pelejero, Carles Goldschmidt Virtual Conference, 4-9 July 2021 Element-calcium ratios in the skeleton of cold-water coral Desmophyllum dianthus represent potential archives for paleo-reconstruction of several ocean properties including temperature and nutrient concentrations. However, relatively large uncertainties in these proxy calibrations and heterogeneity in the skeletal composition have limited its application to date. We address these issues by analyzing corals cultured under systematically varied seawater conditions (phosphate, barium, temperature, pH, feeding frequency) over a two-year period, and refine the calibration of P/Ca, Ba/Ca, U/Ca, and Li/Mg proxies for seawater phosphate, barium, carbonate ion concentration, and temperature, respectively. Composition of the corals is determined using laser-ablation ICPMS, with robust plasma conditions established using the Normalized Argon Index [1], and proxy element incorporation is evaluated for influences of temperature, pH, and feeding frequency. The aragonite precipitated during the stages of the culturing experiment is identified using fluorescent and geochemical labelling of the skeleton through calcein and lead isotopes, respectively. This approach allows us to resolve monthly and annual increments in these slow growing (1-2mm/year) organisms, and also to evaluate the influence of calcification rate on the composition. We address the issue of heterogeneity by adapting methods for LA-ICPMS imaging to create macroscale images to reveal the full pattern of skeletogenesis and related compositional variability of D. dianthus. Preliminary images suggest that heterogeneity stems from the asymmetric precipitation of aragonite, and from centers of calcification (also known as early mineralization zones) that complicate the interpretation of elemental signals throughout the skeleton, but also help to identify new skeletal regions suitable for proxy measurement. Finally, we also discuss the role of endolithic organisms in some of these specimens. [1] Fietzke, J. & Frische, M. (2016), J. Anal. At. Spectrom. 31, 234–244 2022-07-08T09:00:03Z 2022-07-08T09:00:03Z 2021-07-04 2022-07-08T09:00:03Z comunicación de congreso Goldschmidt Virtual Conference (2021) http://hdl.handle.net/10261/275104 Sí none
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
description Goldschmidt Virtual Conference, 4-9 July 2021
format comunicación de congreso
author Ko, Stanley
Sherrell, Robert M.
Martínez-Dios, Ariadna
Lucas, Arturo
Calvo, Eva María
Pelejero, Carles
spellingShingle Ko, Stanley
Sherrell, Robert M.
Martínez-Dios, Ariadna
Lucas, Arturo
Calvo, Eva María
Pelejero, Carles
Proxy calibrations in the cold-water coral Desmophyllum dianthus
author_facet Ko, Stanley
Sherrell, Robert M.
Martínez-Dios, Ariadna
Lucas, Arturo
Calvo, Eva María
Pelejero, Carles
author_sort Ko, Stanley
title Proxy calibrations in the cold-water coral Desmophyllum dianthus
title_short Proxy calibrations in the cold-water coral Desmophyllum dianthus
title_full Proxy calibrations in the cold-water coral Desmophyllum dianthus
title_fullStr Proxy calibrations in the cold-water coral Desmophyllum dianthus
title_full_unstemmed Proxy calibrations in the cold-water coral Desmophyllum dianthus
title_sort proxy calibrations in the cold-water coral desmophyllum dianthus
publishDate 2021-07-04
url http://hdl.handle.net/10261/275104
work_keys_str_mv AT kostanley proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
AT sherrellrobertm proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
AT martinezdiosariadna proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
AT lucasarturo proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
AT calvoevamaria proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
AT pelejerocarles proxycalibrationsinthecoldwatercoraldesmophyllumdianthus
_version_ 1777667784870723584

Similar Items