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Sub project: The Archean to Paleoproterozoic transition as recovered in the FAR DEEP cores: LA-ICP-MS U-Pb geochronology of detrital zircons and accompanying provenance analysis of siliciclastic sedimentary rocks

Description: Das Projekt "Sub project: The Archean to Paleoproterozoic transition as recovered in the FAR DEEP cores: LA-ICP-MS U-Pb geochronology of detrital zircons and accompanying provenance analysis of siliciclastic sedimentary rocks" wird vom Umweltbundesamt gefördert und von Universität Münster, Institut für Geologie und Paläontologie durchgeführt. During the Archaean-Palaeoproterozoic transition many global environmental changes occurred in the Earth's system at the same time as tectonic reorganisations led to the break-up of the supercontinent Kenorland. Stratigraphic successions registering these events were successfully drilled in northern Russia (Fennoscandia) in the FAR-DEEP/ICDP project. - The first part of our study aimed at improving age constraints by Laser Ablation ICP-MS U-Pb geochronology on detrital zircons for three of these events recorded in the FAR DEEP cores. The events are the Huronian glaciation, the Lomagundi-Jatuli positive excursion of delta 13C, and the Shunga event of enhanced deposition of Corg-rich sediments. Our data resulted in tighter temporal constraints for these events. In rocks marking the transition from the Lomagundi-Jatuli to the Shunga event we also found U-Pb ages, now confirmed by ID-TIMS, which are too young regarding their stratigraphic position, and which are difficult to explain in view of the allegedly undisturbed stratigraphic succession. These need to be verified by additional analyses.- Also, the provenance of the analysed zircons and the nature of the recycled, partly Palaeoarchaean crust will be established by LA ICP-MS Hf isotope analysis on dated zircons and by ion microprobe analysis of heavy minerals like tourmaline and rutile.

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SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Münster ? Laser ? Pflanzensamen ? Russland ? Datierung ? Gletscher ? Mikrosondenanalyse ? Register ? Tektonik ? Ingenieurgeologie ? Bohrkern ? Daten ? Geologie ? Ionen ? Isotop ? Paläontologie ? Studie ? Deposition ? Sediment ? Lebensalter ? Festgestein ? Sedimentgestein ? Tiefbohrung ? Bohrung ? Infrastruktur ? Mineral ? Umweltveränderung ? Gestein ? Analyse ? Gesteinsbildung ? Bedarfsanalyse ? Ortsbestimmung ?

Region: Nordrhein-Westfalen

Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°

License: cc-by-nc-nd/4.0

Language: Deutsch

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Time ranges: 2008-01-01 - 2013-12-31

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