Journal article
An Image Mapping Approach to U-Pb LA-ICP-MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation
K Drost, D Chew, JA Petrus, F Scholze, JD Woodhead, JW Schneider, DAT Harper
Geochemistry Geophysics Geosystems | AMER GEOPHYSICAL UNION | Published : 2018
DOI: 10.1029/2018GC007850
Abstract
We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb dating of carbonates based on selection and pooling of pixels from 2-D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add-on for Iolite, with one pixel in the map correspo..
View full abstractGrants
Awarded by Geological Survey of Ireland
Funding Acknowledgements
The study was supported by a Science Foundation Ireland grant (15/IA/3024) that is partly funded by the Geological Survey of Ireland and the Environmental Protection Agency, Ireland. J. A. P. acknowledges a Natural Sciences and Engineering Research Council of Canada (NSERC) postdoctoral fellowship PDF-487902-2016. Carol A. Hill and Victor J. Polyak are thanked for kindly providing a sample of the Long Point Limestone. We appreciate the constructive comments of reviewer Nick Roberts and the editorial handling by Janne Blichert-Toft. The full data tables for analyses presented in this study are provided in supporting information Data Set S1.