WFRF:(Wilmsen D.)
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03677naa a2200613 4500 | |
| 001 | oai:gup.ub.gu.se/320203 | |
| 003 | SwePub | |
| 008 | 240910s2022 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://gup.ub.gu.se/publication/3202032 URI |
| 024 | 7 | a https://doi.org/10.3390/min120708182 DOI |
| 040 | a (SwePub)gu | |
| 041 | a eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Scheiblhofer, E.4 aut |
| 245 | 1 0 | a Revisiting Glauconite Geochronology: Lessons Learned from In Situ Radiometric Dating of a Glauconite-Rich Cretaceous Shelfal Sequence |
| 264 | c 2022-06-27 | |
| 264 | 1 | b MDPI AG,c 2022 |
| 520 | a 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 (similar to 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 (similar to 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 degrees C; <1500 m depth), confirming that glauconite could be a suitable archive for paleo-environmental reconstructions and direct sediment dating. | |
| 650 | 7 | a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng |
| 653 | a glauconite | |
| 653 | a radiometric dating | |
| 653 | a in situ Rb-Sr geochronology | |
| 653 | a diagenesis | |
| 653 | a illitization | |
| 653 | a LA-ICP-MS/MS | |
| 653 | a green-clay authigenesis | |
| 653 | a volcanic ash | |
| 653 | a isotopic constraints | |
| 653 | a penganga | |
| 653 | a group | |
| 653 | a sr | |
| 653 | a rb | |
| 653 | a fe | |
| 653 | a chemistry | |
| 653 | a evolution | |
| 653 | a origin | |
| 653 | a Geochemistry & Geophysics | |
| 653 | a Mineralogy | |
| 653 | a Mining & Mineral Processing | |
| 700 | 1 | a Moser, U.4 aut |
| 700 | 1 | a Lohr, S.4 aut |
| 700 | 1 | a Wilmsen, M.4 aut |
| 700 | 1 | a Farkas, J.4 aut |
| 700 | 1 | a Gallhofer, D.4 aut |
| 700 | 1 | a Bäckström, Alice Matsdotteru Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences4 aut |
| 700 | 1 | a Zack, Thomas,d 1968u Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences4 aut0 (Swepub:gu)xzackt |
| 700 | 1 | a Baldermann, A.4 aut |
| 710 | 2 | a Göteborgs universitetb Institutionen för geovetenskaper4 org |
| 773 | 0 | t Mineralsd : MDPI AGg 12:7q 12:7x 2075-163X |
| 856 | 4 8 | u https://gup.ub.gu.se/publication/320203 |
| 856 | 4 8 | u https://doi.org/10.3390/min12070818 |
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