Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/136268
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dc.contributor.author | Scheiblhofer, E. | - |
dc.contributor.author | Moser, U. | - |
dc.contributor.author | Lӧhr, S. | - |
dc.contributor.author | Wilmsen, M. | - |
dc.contributor.author | Farkaš, J. | - |
dc.contributor.author | Gallhofer, D. | - |
dc.contributor.author | Bäckström, A.M. | - |
dc.contributor.author | Zack, T. | - |
dc.contributor.author | Baldermann, A. | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | Minerals, 2022; 12(7):818-1-818-19 | - |
dc.identifier.issn | 2075-163X | - |
dc.identifier.uri | https://hdl.handle.net/2440/136268 | - |
dc.description.abstract | The scarcity of well-preserved and directly dateable sedimentary sequences is a major impediment to inferring the Earth’s paleo-environmental evolution. The authigenic mineral glauconite can potentially provide absolute stratigraphic ages for sedimentary sequences and constraints on paleo-depositional conditions. This requires improved approaches for measuring and interpreting glauconite formation ages. Here, glauconite from a Cretaceous shelfal sequence (Langenstein, northern Germany) was characterized using petrographical, geochemical (EMP), andmineralogical (XRD) screening methods before in situ Rb-Sr dating via LA-ICP-MS/MS. The obtained glauconite ages (~101 to 97 Ma) partly overlap with the depositional age of the Langenstein sequence (±3 Ma), but without the expected stratigraphic age progression, which we attribute to detrital and diagenetic illitic phase impurities inside the glauconites. Using a novel age deconvolution approach, which combines the new Rb-Sr dataset with published K-Ar ages, we recalculate the glauconite bulk ages to obtain stratigraphically significant ‘pure’ glauconite ages (~100 to 96 Ma). Thus, our results show that pristine ages can be preserved in mineralogically complex glauconite grains even under burial diagenetic conditions (T < 65 ◦C; <1500 m depth), confirming that glauconite could be a suitable archive for paleo-environmental reconstructions and direct sediment dating. | - |
dc.description.statementofresponsibility | Esther Scheiblhofer, Ulrike Moser, Stefan Löhr, Markus Wilmsen, Juraj Farkaš, Daniela Gallhofer, Alice Matsdotter Bäckström, Thomas Zack, and Andre Baldermann | - |
dc.language.iso | en | - |
dc.publisher | MDPI AG | - |
dc.rights | © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/) | - |
dc.source.uri | http://dx.doi.org/10.3390/min12070818 | - |
dc.subject | glauconite; radiometric dating; in situ Rb-Sr geochronology; diagenesis; illitization; LA-ICP-MS/MS | - |
dc.title | Revisiting Glauconite Geochronology: Lessons Learned from In Situ Radiometric Dating of a Glauconite-Rich Cretaceous Shelfal Sequence | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.3390/min12070818 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DP210100462 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Earth and Environmental Sciences publications |
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File | Description | Size | Format | |
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hdl_136268.pdf | Published version | 25.67 MB | Adobe PDF | View/Open |
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