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Improving proxy calibrations in Desmophyllum dianthus: assessment of elemental abundances and distributions using LA-ICPMS

AuthorsKo, Stanley; Sherrell, Robert M.; Kozdon, Reinhard; Pelejero, Carles ; López-Sanz, Àngel ; Calvo, Eva María ; Bostock, H.; Tracey, Di
Issue Date19-Jun-2017
AbstractPrevious work has shown elemental ratios of P/Ca, Ba/Ca, U/Ca in deep sea coral Desmophyllum dianthus to be proxies for seawater nutrient and carbonate concentrations. We seek to refine micromilling-solution-ICPMS and LA-ICPMS sampling methods for these elements, and to improve proxy calibrations by assessing elemental abundances and distributions in fossilized and cultured D. dianthus, which grow at ~1mm per year. Preliminary work on fossilized specimens has shown promise in providing quick, reasonable, and reproducible data but the heterogeneous compositions around centers of calcifications (COCs) present challenges. Elements such as Fe, Mn, Zn, and Cu have shown large variations between and within specimens and the effect of such heterogeneity, if any, on the proxies and on age screening methods is largely unknown. Small-scaled systematic variations in chemical composition may reveal unknown aspects about calcification and warrants further investigation. Ongoing incubation experiments at the ICM in Barcelona will provide insight on the composition of cultured D. dianthus. Preliminary work using confocal microscopy and laser ablation analyses along traverses as well as depth profiling has demonstrated the capability to distinguish growth before the collection of the coral from Comau Fjord, Chile and from growth during different stages of the experiment
DescriptionWiscSIMS workshop High-Resolution Proxies of Paleoclimate (HiRes2017), 18-21 June 2017, Madison, Wisconsin
Publisher version (URL)http://www.geology.wisc.edu/~wiscsims/Hires2017/
Appears in Collections:(ICM) Comunicaciones congresos
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