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Experimental paleo-proxy calibration in cold water corals

AuthorsSherrell, Robert M.; Pelejero, Carles ; Fuertes Vila, Sara; López-Sanz, Àngel ; Calvo, Eva María ; Kozdon, Reinhard; Gagnon, Alexander
Issue Date11-Sep-2016
Citation6th International Symposium on Deep-Sea Corals (2016)
AbstractCold-water corals (CWCs) display an almost cosmopolitan distribution over a wide range of depths. Similar to their tropical counterparts, they provide continuous, high-resolution (annual to seasonal) records of up to a century or more. Several CWC elemental and isotopic ratios have been suggested as useful proxies, but robust calibrations under controlled conditions in aquaria are needed. Whereas a few experimental proxy calibrations have been performed for tropical corals, they are still pending for CWCs. This reflects the technical challenges involved in maintaining these slow-growing creatures alive in aquaria during the long-term experiments required to achieve sufficient skeletal growth for geochemical analyses. In this presentation we will show details of the set up and initial results of a long-term experiment being run at the ICM aquaria facilities in Barcelona, where live specimens (>150) of the CWC Desmophyllum dianthus, are kept under controlled and manipulated chemistry (pH, phosphate, barium) and feeding conditions. With this set-up, we aim to experimentally calibrate specific elemental ratios including P/Ca, Ba/Ca, B/Ca and U/Ca as proxies of nutrient dynamics, pH, and carbonate ion concentration. We present preliminary results using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS), which allows quantitative analyses on spot sizes of tens of microns. We will also attempt measurements using NanoSIMS, to resolve nano-scale details in relative composition. Preliminary data obtained from these techniques will be presented, together with monitoring parameters regarding coral growth and physiology including skeletal growth, coral calcification and respiration
Description6th International Symposium on Deep-Sea Corals (ISDSC), 11-16 September 2016, Boston
Publisher version (URL)https://deepseacoral.org/program/
Appears in Collections:(ICM) Comunicaciones congresos
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