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In-situ LA-ICP-MS/MS Rb-Sr dating and its potential for sedimentology and stratigraphy

In-situ Rb-Sr dating using laser ablation (LA) systems coupled to inductively coupled plasma (ICP) – reaction cell mass spectrometers (MS/MS) is an emerging geochronological tool. This analytical setup uses reaction gases to allow the reaction of targeted masses. 87Rb and 87Sr can for example be separated chemically to avoid the isobaric overlap during mass-spectrometric analysis. In-situ Rb-Sr LA-ICP-MS/MS dating has until now successfully been applied to date magmatic, metamorphic and tectonic events as well as ore formation processes. In addition, it has huge potential for sedimentology and stratigraphy.

Here, we present case studies of in-situ Rb-Sr LA-ICP-MS/MS dating of detrital minerals (mica and feldspar) and glauconite. We focus on (1) the analytical routine, (2) data reduction and age calculation strategy and (3) interpretation of in-situ Rb-Sr age data. In addition, we demonstrate advantages of volume-coupled major and trace element data collected from the same laser spots. This data can for example be used as indicator of alteration and as multi-proxy tool for provenance studies.

Details

Author
Delia Rösel1, Roland Neofitu2, Chris Mark3, Thomas Zack1
Institutionen
1Department of Earth Sciences, University of Gothenburg, Sweden; 2School of Earth Sciences, University College Dublin, Ireland; 3Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden
Veranstaltung
GeoSaxonia 2024
Datum
2024
DOI
10.48380/m249-mw40