Articles | Volume 3, issue 1
Research article
03 Feb 2021
Research article |  | 03 Feb 2021

Direct U–Pb dating of carbonates from micron-scale femtosecond laser ablation inductively coupled plasma mass spectrometry images using robust regression

Guilhem Hoareau, Fanny Claverie, Christophe Pecheyran, Christian Paroissin, Pierre-Alexandre Grignard, Geoffrey Motte, Olivier Chailan, and Jean-Pierre Girard

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Cited articles

Aramendía, M., Rello, L., Bérail, S., Donard, A., Pécheyran, C., and Resano, M.: Direct analysis of dried blood spots by femtosecond-laser ablation-inductively coupled plasma-mass spectrometry. Feasibility of split-flow laser ablation for simultaneous trace element and isotopic analysis, J. Anal. Atom. Spectrom., 30, 296–309, 2015. 
Ballihaut, G., Claverie, F., Pécheyran, C., Mounicou, S., Grimaud, R., and Lobinski, R.: Sensitive Detection of Selenoproteins in Gel Electrophoresis by High Repetition Rate Femtosecond Laser Ablation-Inductively Coupled Plasma Mass Spectrometry, Anal. Chem., 79, 6874–6880, 2007. 
Beaudoin, N., Lacombe, O., Roberts, N. M. W., and Koehn, D.: U-Pb dating of calcite veins reveals complex stress evolution and thrust sequence in the Bighorn Basin, Wyoming, USA, Geology, 46, 1015–1018,, 2018. 
Canudo, J. I. and Molina, E.: Biocronología de foraminíferos planctónicos de la secuencia deposicional de Jaca (Pirineo Aragonés): Eoceno medio y superior, in: Proceedings of the II Congreso Geológico de España, Granada, Spain, 273–276, 1988 (in Spanish). 
Drost, K., Chew, D., Petrus, J. A., Scholze, F., Woodhead, J. D., Schneider, J. W., and Harper, D. A. T: An image mapping approach to U-Pb LA-ICP-MS carbonate dating and applications to direct dating of carbonate sedimentation, Geochem., Geophy., Geosy., 19, 46314648,, 2018. 
Short summary
A new methodology for the micron-scale uranium–lead dating of carbonate minerals is proposed. It is based on the extraction of ages directly from pixel images (< 1 mm2) obtained by laser ablation coupled to a mass spectrometer. The ages are calculated with a robust linear regression through the pixel values. This methodology is compared to existing approaches.