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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.

English title 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.
Applicant Schaltegger Urs
Number 126500
Funding scheme Project funding
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geochronology
Start/End 01.12.2009 - 30.11.2011
Approved amount 276'857.00
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All Disciplines (2)

Discipline
Geochronology
Palaeontology

Keywords (16)

Triassic-Jurassic boundary; Permian-Triassic boundary; Toarcian anoxic event; U-Pb zircon geochronology; volcanic ash beds; South China; Peru; isotope dilution U-Pb geochronology; Earthtime; Time-scales; Permo-Triassic boundary; Pliensbachian-Toarcian global anoxic event; U-Pb dating; zircon; Karoo volcanic province; Central Atlantic Magmatic province

Lay Summary (English)

Lead
Lay summary
This project proposal suggests to continue research using highly precise and accurate U-Pb age determinations on zircon from volcanic ash beds to investigate important periods of biotic disturbance, climate change or mass extinction in the history of our planet:(1)Quantifying biodiversification rates before, during and after the Permian-Triassic boundary (PTB) mass extinction event in South China. Comparing the radioisotopic calibration of radiolarian, conodont and ammonoid schemes across the PTB with the section of the Global Stratotype Section and Point (GSSP) at Meishan.(2)Questioning the general approach of using first appearance data (FAD) of specific species for the definition of geological stage boundaries. We intend to demonstrate the diachronism for the FAD of the conodont Hindeodus parvus, used to define the base of the Triassic.(3)Quantifying biodiversification rates before, during and after the Triassic-Jurassic boundary (TJB) mass extinction event: Completing the radioisotopic calibration of a unique section in northern Peru and extending the dataset downwards into the upper Triassic (Norian-Rhetian) and upwards into the Sinemurian.(4)Quantifying biodiversification rates before, during and after the lower Toarcian global anoxic crisis: Detailed study of a undisturbed and well-exposed section in southern Peru. Relating the early Toarcian global anoxic event to the eruption of the Karoo flood basalt province in Botswana and Lesotho by high-precision U-Pb zircon dating.(5)Generally improving the radio-isotopic calibration of the Triassic and the Jurassic, in order to allow for cross-correlations between biostratigraphic schemes based on ammonoids, conodonts, bivalves or radiolarians, between carbon-isotope and biostratigraphic records, and for comparison of sections on different continents that show large taxonomic differences.Advances in U-Pb dating techniques since the beginning of our work have resulted in U-Pb age determinations at the permil level of uncertainty.Using this enhanced precision and accuracy we intend to continue our research efforts to better quantify the interaction of life and climate by incorporating high-precision geochronology with paleoclimatology, biochronology, cyclo- and magnetostratigraphy, as well as to link phases of global biotic disturbance with possible causes, i.e. volcanic activity of large igneous provinces such as the Central Atlantic Magmatic province or the Karoo flood basalt province
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Geochronological constraints on post-extinction recovery of the ammonoids and carbon cycle perturbations during the Early Jurassic
Guex J., Schoene B., Bartolini A., Spangenberg J., Schaltegger U., O'Dogherty L., Taylor D., Bucher H., Atudorei V. (2012), Geochronological constraints on post-extinction recovery of the ammonoids and carbon cycle perturbations during the Early Jurassic, in Palaeogeography, Palaeoclimatology, Palaeoecology, 346-347, 1-11.
Disentangling the Hettangian carbon isotope record: Implications for the aftermath of the end‐Triassic mass extinction
Bartolini A., Guex J., Spangenberg J., Schoene B., Schaltegger U., Atudorei V. (2012), Disentangling the Hettangian carbon isotope record: Implications for the aftermath of the end‐Triassic mass extinction, in Geochemistry, Geophysics, Geosystems, 13(1), Q01007-Q01007.
A new method integrating high-precision U-Pb geochronology with zircon trace element analysis (U-Pb TIMS-TEA)
Schoene B, Latkoczy C, Schaltegger U, Gunther D (2010), A new method integrating high-precision U-Pb geochronology with zircon trace element analysis (U-Pb TIMS-TEA), in GEOCHIMICA ET COSMOCHIMICA ACTA, 74(24), 7144-7159.
Correlating the end-Triassic mass extinction and flood basalt volcanism at the 100 ka level
Schoene B, Guex J, Bartolini A, Schaltegger U, Blackburn TJ (2010), Correlating the end-Triassic mass extinction and flood basalt volcanism at the 100 ka level, in GEOLOGY, 38(5), 387-390.
Zircon and titanite recording 1.5 million years of magma accretion, crystallization and initial cooling in a composite pluton (southern Adamello batholith, northern Italy)
Schaltegger U, Brack P, Ovtcharova M, Peytcheva I, Schoene B, Stracke A, Marocchi M, Bargossi GM (2009), Zircon and titanite recording 1.5 million years of magma accretion, crystallization and initial cooling in a composite pluton (southern Adamello batholith, northern Italy), in EARTH AND PLANETARY SCIENCE LETTERS, 286(1-2), 208-218.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
AGU Fall Meeting 2011 05.12.2011 San Francisco
Swiss Geoscience Meeting 11.11.2011 Zürich
GSA Annual Meeting 2011 09.10.2011 Minneapolis, USA
Goldschmidt Conference 14.08.2011 Prague
11th ISOS Meeting 09.05.2011 Madrid, Spain
EGU 2011 03.03.2011 Vienna
Swiss Geoscience Meeting 19.11.2010 Fribourg
EGU 2010 02.05.2010 Vienna


Associated projects

Number Title Start Funding scheme
113554 The Early Triassic biotic recovery and climatic/oceanographic contraints 01.01.2007 Project funding
156424 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 01.12.2014 Project funding
121556 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. 01.10.2008 Project funding
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
121556 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. 01.10.2008 Project funding
109491 Acquisition of a new thermal ionization mass spectrometer 01.10.2005 Project funding
111559 Stratigraphic research on the Mesozoic of the Tethyan and Pacific realms 01.04.2006 Project funding
146994 Temporal calibration of eruption dynamics of Large Igneous Provinces and correlation with global environmental disturbance and biotic response by high-precision U-Pb dating of micro-baddeleyite 01.01.2014 Project funding

Abstract

This project proposal suggests to continue research using highly precise and accurate U-Pb age determinations on zircon from volcanic ash beds to investigate important periods of biotic disturbance, climate change or mass extinction in the history of our planet:(1)Quantifying biodiversification rates before, during and after the Permian-Triassic boundary (PTB) mass extinction event: continue ongoing research in the Nanpanjiang basin (West Guangxi, South China; started already in projects 200020-103335 and -113387), and extending into the upper Permian Wuchiapingian and Changhsingian substages. Comparing the radioisotopic calibration of radiolarian, conodont and ammonoid schemes from platform, slope and deep water sections across the PTB with the section of the Global Stratotype Section and Point (GSSP) at Meishan.(2)Questioning the general approach of using first appearance data (FAD) of specific species for the definition of geological stage boundaries. By using biostratigraphy coupled with precise U-Pb age determinations on volcanic zircons in Wuchiapingian, Changhsingian, Griesbachian and Dienerian sections of the Nanpanjiang basin we intend to demonstrate the diachronism for the FAD of the conodont Hindeodus parvus, which is used to define the base of the Triassic. The results will possibly point to the fact that the GSSP of the Permian-Triassic boundary in Meishan is unsuitable, because of poor occurrence and preservation of ammonoid species, diachronism of H. parvus, and effects of condensation horizons and gaps in boundary Bed 25 at Meishan.(3)Quantifying biodiversification rates before, during and after the Triassic-Jurassic boundary (TJB) mass extinction event: Completing the radioisotopic calibration of a unique section in Utcubamba valley (northern Peru), started in project 200020-113387 and -121556, and extending the dataset downwards into the upper Triassic (Norian-Rhetian) and upwards into the Sinemurian.(4)Quantifying biodiversification rates before, during and after the lower Toarcian global anoxic crisis: Detailed study of a undisturbed and well-exposed section in southern Peru (area of Palca, Tacna), ranging from Sinemurian to Bathonian. Relating the early Toarcian global anoxic event to the eruption of the Karoo flood basalt province in Botswana and Lesotho by high-precision U-Pb zircon dating.(5)Generally improving the radio-isotopic calibration of the Triassic and the Jurassic, in order to allow for cross-correlations between biostratigraphic schemes based on ammonoids, conodonts, bivalves or radiolarians, between carbon-isotope and biostratigraphic records, and for comparison of sections on different continents that show large taxonomic differences.Advances in U-Pb dating techniques since the beginning of our work have resulted in U-Pb age determinations at the permil level of uncertainty. Careful cross-calibration with leading U-Pb laboratories using natural and synthetic standards have resulted in interlaboratory reproducibilities in the permil range, too. Our new techniques include annealing/leaching pre-treatment on individual zircon grains (in order to eliminate lead loss), lowest procedural blanks of 0.5 pg Pb, utilisation of the new double-lead/double-uranium EARTHTIME tracer, and measurement by highly linear ion counting and/or high-sensitivity faraday collectors on our TRITON thermal ionization mass spectrometer.Using this enhanced precision and accuracy we intend to continue our research efforts to better quantify the interaction of life and climate by incorporating high-precision geochronology with paleoclimatology, biochronology, cyclo- and magnetostratigraphy, as well as to link phases of global biotic disturbance with possible causes, i.e. volcanic activity of large igneous provinces such as the Central Atlantic Magmatic province or the Karoo flood basalt province.
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