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The fourth dimension: resolving the time-scales of magma evolution

English title The fourth dimension: resolving the time-scales of magma evolution
Applicant Schaltegger Urs
Number 123107
Funding scheme ProDoc
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geochemistry
Start/End 01.04.2009 - 31.05.2013
Approved amount 552'140.00
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All Disciplines (3)

Discipline
Geochemistry
Geochronology
Geophysics

Keywords (18)

Zircon; U-Pb geochronology; thermal ionisation mass spectrometry; laser ablation ICP-MS; Adamello batholith; northern Italy; magma accretion; hafnium isotopes; geochemistry; hafnium isotopes; laser ablation ICP-MS; magma accretion; Adamello batholith; Zircon; thermal ionisation mass spectrometry; geochemistry; U-Pb geochronology; northern Italy

Lay Summary (English)

Lead
Lay summary

With the advent of ultra-precise U-Pb age determinations we are faced with a number of effects that could not be resolved with previous analytical techniques. To be able to put a geological meaning to an analyzed date, we need to understand the growth history of the dated zircon grains better than we do today. The goal of this research is to investigate a complex magmatic system and its accessory minerals in a unprecedented degree of detail. We want to answer fundamental questions about the evolution of a multiphase intrusion history, which integrates several 100ky up to a few my of magma transport, assembly and emplacement: When do different magma batches arrive at zircon saturation? By precise age determinations by accurate determination of trace elements, we will be able to differentiate between xenocrystic zircon (inherited from other rocks), antecrystic zircon (crystallized in the same magma chamber and therefore showing similar chemical characteristics, but slightly older age), and autocrystic zircon (saturated and crystallized in the present host rock). We develop a series of chemical and isotopic proxies for the distinction of ante- and autocrystic zircon, or for distinguishing prolonged zircon growth from instant precipitation in residual liquids in an originally zircon undersaturated mafic magma. Such proxies include oxygen, hafnium isotopes, RE elements, fO2, and many more.

The first PhD project develops and tests different chemical and isotopic techniques in the southern part, whereas the second PhD is focussing on the lesser known middle and northern part of the Adamello batholith, where modern geological mapping was done, but no adequate chemical characterisation nor a temporal framework is available.
The planned research will be a milestone in U-Pb geochronology and the understanding of magmatic systems and will add the fourth dimension to the entire ProDoc program. The composite Adamello batholith records 10 million years of magma emplacement. This research module will establish a quantitative dataset for the temporal dimension of batholith emplacement, and enables the students from other research modules, and the ProDoc school as a whole, to arrive at a time-resolved thermomechanical model of batholith emplacement.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Linking the thermal evolution and emplacement history of an upper‑crustal pluton to its lower‑crustal roots using zircon geochronology and geochemistry (southern Adamello batholith, N. Italy)
Broderick Cindy Ann (2015), Linking the thermal evolution and emplacement history of an upper‑crustal pluton to its lower‑crustal roots using zircon geochronology and geochemistry (southern Adamello batholith, N. Italy), in Contributions to Mineralogy and Petrology, 170, 28.
Rates of magma differentiation and emplacement in a ballooning pluton recorded by U-Pb TIMS-TEA, Adamello batholith, Italy
Schoene B., Schaltegger U., Brack P., Latkoczy C., Stracke A., Günther D., Samperton K. (2012), Rates of magma differentiation and emplacement in a ballooning pluton recorded by U-Pb TIMS-TEA, Adamello batholith, Italy, in Earth and Planetary Science Letters, 355-356, 162-173.
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.
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.

Collaboration

Group / person Country
Types of collaboration
J. W. Goethe Univ. Frankfurt Germany (Europe)
- Publication
- Research Infrastructure
Uni. Lausanne, Inst. de Minéralogie Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
ETH Zürich, Institut für Petrologie-Geochemie Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
ETH Zürich, Chemisches Institut Switzerland (Europe)
- Publication
- Research Infrastructure
Princeton University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Goldschmidt Conference Individual talk The construction of the Alpine Adamello batholith as recorded by zircon 24.06.2012 Montreal, Canada Broderick Cindy; Nowak Alexandra; Brack Peter; Schaltegger Urs;
EGU Poster Magma evolution as seen through zircon geochemistry: an example from the Southern Adamello Batholith, N. Italy 22.04.2012 Vienna, Austria Brack Peter; Schaltegger Urs; Broderick Cindy;
EGU Poster Disentangling the processes and sources of tonalites from the Adamello Batholith (Italian Alps) 22.04.2012 Vienna, Austria Brack Peter; Nowak Alexandra; Schaltegger Urs;
EGU Individual talk How can we construct timescales of pluton emplacement? 22.04.2012 Vienna, Austria Nowak Alexandra; Schaltegger Urs; Broderick Cindy;
AGU Fall Meeting Individual talk Tracing episodic magma accretion by stable and radiogenic isotopes and U-Pb dating in the Adamello batholith, Italy 06.12.2011 San Francisco, United States of America Brack Peter; Broderick Cindy; Schaltegger Urs;
Goldschmidt Conference Poster The rapid emplacement of the Val Fredda Complex, Adamello batholith, N. Italy 14.08.2011 Prague, Czech Republic Broderick Cindy; Schaltegger Urs; Brack Peter;
Goldschmidt Conference Individual talk Tracing episodic magma accretion by zircon 18O/16O isotopes and U-Pb dating in the Adamello batholith, Italy 14.08.2011 Prague, Czech Republic, Czech Republic Nowak Alexandra; Brack Peter; Schaltegger Urs;
AGU Fall Meeting Poster The resolving power of U-Pb zircon geochronology in magmatic dsystems: an example from the Southern Adamello Batholith, N. Italy 13.12.2010 San Francisci, United States of America Broderick Cindy; Schaltegger Urs; Brack Peter;
8 th Swiss Geoscience Meeting Poster The Adamello batholith (Italy): a fossil magma chamber or accumulation of magma pulses? 19.11.2010 Fribourg, Switzerland Nowak Alexandra; Schaltegger Urs;
GSA Annual Meeting Poster Timescales of batholith assembly: The Adamello batholith, Italy 31.10.2010 Denver, United States of America Broderick Cindy; Schaltegger Urs; Nowak Alexandra; Brack Peter;


Associated projects

Number Title Start Funding scheme
133197 Oxygen isotope disequilibria between minerals in different members of the Adamello batholith, northern Italy 01.08.2010 International short research visits

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