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Experimental paleo-proxy calibration in cold water corals
|Authors:||Sherrell, Robert M.; Pelejero, Carles ; Fuertes Vila, Sara; López-Sanz, Àngel ; Calvo, Eva María ; Kozdon, Reinhard; Gagnon, Alexander|
|Citation:||6th International Symposium on Deep-Sea Corals (2016)|
|Abstract:||Cold-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|
|Description:||6th 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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