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Establishing globally valid tie points for intercalibration of biochronologic and radioisotopic timescales between the latest Permian and middle Jurassic using high-precision U-Pb dating of volcanic ash beds

English title Establishing globally valid tie points for intercalibration of biochronologic and radioisotopic timescales between the latest Permian and middle Jurassic using high-precision U-Pb dating of volcanic ash beds
Applicant Schaltegger Urs
Number 156424
Funding scheme Project funding (Div. I-III)
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geochronology
Start/End 01.12.2014 - 31.12.2018
Approved amount 473'307.00
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All Disciplines (2)

Discipline
Geochronology
Palaeontology

Keywords (11)

zircon; U-Pb dating; Triassic; Permian; mass spectrometry; Geochronology; Jurassic; conodonts; volcanic ash beds; ammonoids; time-scale

Lay Summary (German)

Lead
Welche globalen Klimaänderungen geschahen an wichtigen geologischen Grenzen? Wie reagierte die Umwelt und das Leben auf solche Umwälzungen, und welches waren die Zeiträume über welche sich solche Klimakrisen abwickelten?
Lay summary

Dieses Projekt versucht, die geologischen Abschnitte des spätesten Perms, der Trias und des frühen und mittleren Juras zeitlich zu kalibrieren. Hoch-präzise U-Pb Altersbestimmungen erlauben eine zeitliche Auflösung von ± 100'000 Jahren bei einem Alter von 250 Millionen Jahren. Mit diesem Projekt wollen wir bio- und chemostratigraphische Zeitskalen interkalibrieren, und die Prozesse verstehen,welche zu Umwälzungen der Umwelt geführt haben. Von ausserordentlichem Interesse ist die zeitliche Rekonstruktion der Reaktionsmechanismen von Lebewesen, welche anhand von Fossilien quantifiziert werden muss. Wir werden versuchen, die Veränderungen verschiedener Variablen in der geologischen Vergangenheit zeitlich zu erfassen, z.B. Biodiversität, Kohlenstoff-Zyklus, Meerwasser-Temperatur, und vieles mehr.

Direct link to Lay Summary Last update: 17.10.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Dynamics of the Largest Carbon Isotope Excursion During the Early Triassic Biotic Recovery
Widmann Philipp, Bucher Hugo, Leu Marc, Vennemann Torsten, Bagherpour Borhan, Schneebeli-Hermann Elke, Goudemand Nicolas, Schaltegger Urs (2020), Dynamics of the Largest Carbon Isotope Excursion During the Early Triassic Biotic Recovery, in Frontiers in Earth Science, 8, 126.
Calibrating chemical abrasion: Its effects on zircon crystal structure, chemical composition and U Pb age
Widmann P., Davies J.H.F.L., Schaltegger U. (2019), Calibrating chemical abrasion: Its effects on zircon crystal structure, chemical composition and U Pb age, in Chemical Geology, 511, 1-10.
High-precision time-space correlation through coupled apatite and zircon tephrochronology: An example from the Permian-Triassic boundary in South China
Baresel B., D'Abzac F.-X., Bucher H., Schaltegger U. (2017), High-precision time-space correlation through coupled apatite and zircon tephrochronology: An example from the Permian-Triassic boundary in South China, in Geology, 45, 83-86.
Precise age for the Permian–Triassic boundary in South China from high-precision U-Pb geochronology and Bayesian age–depth modeling
Baresel B., Bucher H., Brosse M., Cordey F., Guodun K., Schaltegger U. (2017), Precise age for the Permian–Triassic boundary in South China from high-precision U-Pb geochronology and Bayesian age–depth modeling, in Solid Earth, 8, 361-378.
Timing of global regression and microbial bloom linked with the Permian-Triassic boundary mass extinction: implications for driving mechanisms
Baresel B., Bucher H., Bagherpour B., Brosse M., Guodun K., Schaltegger U. (2017), Timing of global regression and microbial bloom linked with the Permian-Triassic boundary mass extinction: implications for driving mechanisms, in Scientific Reports, 7, 43630.
Developing a strategy for accurate definition of a geological boundary through radio-isotopic and biochronological dating: The Early–Middle Triassic boundary (South China)
Ovtcharova Maria, Goudemand Nicolas, Hammer Oyvind, Guodun Kuang, Cordey Fabrice, Galfetti Thomas, Schaltegger Urs, Bucher Hugo (2015), Developing a strategy for accurate definition of a geological boundary through radio-isotopic and biochronological dating: The Early–Middle Triassic boundary (South China), in Earth Science Reviews, 146, 65-76.

Collaboration

Group / person Country
Types of collaboration
University of Lausanne, Institut des sciences de laTerre Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Lausanne, Institut des dynamiques de la surface terrestre Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
GSA Annual Meeting Talk given at a conference Attempts to calibrate chemical abrasion: effects on crystal structure, chemical composition, and U/Pb age 04.11.2018 Indianapolis, United States of America Schaltegger Urs; Widmann Philipp;
Goldschmidt Conference Talk given at a conference Heading towards the most precise, accurate and reproducible U-Pb age of least material. 13.08.2018 Boston, United States of America Schaltegger Urs;
Goldschmidt Conference Poster Intercalibration of two TIMS platforms at the 100ppm precision level for U-Pb geochronology. 12.08.2018 Boston, United States of America Schaltegger Urs; Widmann Philipp;
Goldschmidt Conference Poster Towards a calibration of the “chemical abrasion” technique 13.08.2017 Paris, France Widmann Philipp; Schaltegger Urs;
EGU 2017 Talk given at a conference Timing of global regression and microbioal bloom linked with the Permian-Triassic mass extinction: implications for driving mechanisms 23.04.2017 Vienna, Austria Baresel Björn; Bucher Hugo; Schaltegger Urs;
EGU 2017 Poster New high-precision U-Pb calibration of the late Early-Triassic (Smithian-Spathian Boundary, South China). 23.04.2017 Vienna, Austria Bucher Hugo; Widmann Philipp; Schaltegger Urs;
GSA Annual Meeting Poster High-precision U-Pb dating of the Permian-Triassic boundary in marine deep water settings 25.09.2016 Denver, United States of America Bucher Hugo; Schaltegger Urs; Baresel Björn;
EGU 2016 Poster High precision dating of mass extinction events: a combined zircon geochronology, apatite tephrochronology, and Bayesian age modelling approach of the Permian-Triassic boundary extinction 17.04.2016 Vienna, Austria Baresel Björn; Schaltegger Urs; Bucher Hugo;


Communication with the public

Communication Title Media Place Year
Media relations: radio, television Extinction des espèces, l'hypothèse du froid RTS Western Switzerland 2017
Media relations: print media, online media Massenaussterben Kühlhaus statt Treibhaus NZZ German-speaking Switzerland 2017

Associated projects

Number Title Start Funding scheme
180253 Quantifying decamillennial changes in carbon cycling, climatic and biotic responses to Late Permian-Early Triassic volcanism 01.11.2018 Sinergia
137630 Establishing globally valid tie points for intercalibration of biochronologic and radioisotopic timescales between the latest Permian and middle Jurassic using high-precision U-Pb dating of volcanic ash beds 01.12.2011 Project funding (Div. I-III)
126500 Precise and accurate dating of periods of biotic crisis and recovery in the Earth's history using zircon U-Pb dating of volcanic ash beds. 01.12.2009 Project funding (Div. I-III)
182007 Temporal coupling of environmental change, volcanism and evolution in the geological past through high-precision geochronology 01.01.2019 Project funding (Div. I-III)
162341 Temporal calibration of eruption dynamics of Large Igneous Provinces and correlation to global environmental disturbance with high-precision U-Pb dating of micro-zircon and -baddeleyite 01.01.2016 Project funding (Div. I-III)
163984 A new termal ionization mass spectrometer for high-precision U-Pb geochronology 01.12.2015 R'EQUIP
124375 Stratigraphic research on the Mesozoic of the Tethyan and Pacific realms 01.04.2009 Project funding (Div. I-III)
135446 The onset of the Early Triassic biotic recovery 01.04.2011 Project funding (Div. I-III)

Abstract

This proposal is seeking for a continuation of funding to work on the temporal quantification of the latest Permian, the Triassic and the Early to Middle Jurassic time-scale with high-precision U-Pb geochronology using state or the art procedures and achieving age resolution of better than ± 100'000 years. The principal object is the precise intercalibration of the bio- and chemostratigraphic record in order to understand the processes of environmental change in the geological past, and to quantify rates of biotic and abiotic responses. The project is subdivided into 4 parts:A.Reassessment of the Permo-Triassic boundary in deep-water and outer platform facies in the Nanpanjiang Basin (S. China). Among the main objectives are: (i) definition of the PTB in shallow water environment (outer platform facies) relative to a conspicuous microbial limestone at the PTB, relative to conodont associations instead of the first appearances of a single index species and relative to C isotopes; (ii) definition of the PTB in deeper water sections, relative to the lithological change from mixed carbonate-siliciclastic sediments to shales and relative to C isotopes; (iii) development of tephrachronological tools using zircon and apatite trace element compositions, and (iv) detecting changes in the type of regional volcanism to understand its influence on seawater carbon isotope composition in South China.B.We further intend to calibrate not only important boundaries in the History of Earth and Life but also protracted time intervals during which global cycles of biotic and abiotic changes closely followed each other in time. The point here is to quantify rates of change of variables such as biotic diversity and turnover, the C-cycle, sea surface temperature and seawater acidification linked to atmospheric CO2 in order to address the following general questions: (1) Does the speed of change of such global abiotic parameters impact on the biotic responses of organisms during cycles of extinction and recoveries or do absolute values matter above all? (2) Are any response times between these parameters detectable within these cycles by means high- precision of radio-isotopic dates? The rates of biotic and abiotic feedback to global environmental change can be studied in deep time when process rates are slow, and by using our high-precision geochronological tools. These objectives will be attained through high-precision U-Pb dating, detailed biochronology and C, O (possibly Ca) isotope time series in the Early Triassic of South China. C.After our previous studies in the topmost Rhaetian, at the Triassic/Jurassic boundary, in the Hettangian and the Toarcian, we plan to explore new sections in Nevada and Oregon (USA) and in Central Peru, in order to complete the Triassic-Jurassic time-scale by adding temporal tie-points in the Sinemurian, Pliensbachian, Aalenian and Bajocian that are well-defined by ammonoid biochronology and radio-isotopic dating. The geochronological database for the Middle Jurassic is particularly poor when compared to the rest of the Mesozoic; the main GSSP's of the Aalenian, Bajocian and Bathonian have not been dated with radio-isotopic methods. A special effort is planned to fill these gaps using well documented sections in Oregon (USA).D.U-Pb age determinations at the forefront of precision and accuracy needs a constant effort of system calibration through synthetic solutions and natural reference materials in order to document short and long-term reproducibility, and inter-laboratory cross-calibration exercises to document the potential of the international EARTHTIME community to maintain our unprecedented precisions.This project intends to continue our significant contribution to the Mesozoic timescale by cross-calibration of bio- and chemo-stratigraphic records by high-precision radio-isotopic dating. It will try to temporally resolve abiotic and biotic responses to global change and to quantify rates of these changes. These very ambitious objectives are tackled with a very challenging sampling strategy for a variety of age-diagnostic fossils, ash beds and carbonates, in combination with forefront analytical techniques in radio-isotopic dating, trace element mineral analysis, and stable and radiogenic isotope analysis.
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