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Oxygen isotope disequilibria between minerals in different members of the Adamello batholith, northern Italy

English title Oxygen isotope disequilibria between minerals in different members of the Adamello batholith, northern Italy
Applicant Bindeman Ilya
Contact person Schaltegger Urs
Number 133197
Funding scheme International short research visits
Research institution
Institution of higher education University of Geneva - GE
Main discipline Geochemistry
Start/End 01.08.2010 - 31.10.2010
Approved amount 11'040.00
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All Disciplines (2)

Discipline
Geochemistry
Geochronology

Keywords (8)

zircon; quartz; plutonic rocks; isotopic disequilibrium; antecryst; oxygen stable isotopes; Adamello; magmatism

Lay Summary (English)

Lead
Lay summary
The aim of our proposed investigation of plutonic rocks from the Adamello batholith is to perform a microanalytical, single-crystal and zircon-based study of one of the most famous Alpine plutonic intrusions, understand the diverse sources of their magma, the timescales for magmatic assemby, the efficiency of magma homogenization, and eventually the processes and degree of post-crystallization, subsolidus re-equilibration of oxygen isotopes in magmatic minerals. The research will be carried out on perfectly characterized sample material that is investigared in the course of existing research projects, involving among other high-precision and high-accuracy U-Pb age determinations of single zircon grains by ID-TIMS
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Associated projects

Number Title Start Funding scheme
123107 The fourth dimension: resolving the time-scales of magma evolution 01.04.2009 ProDoc

Abstract

Plutonic rocks are constituted by minerals that crystallize before and during emplacement, called xenocrysts (if their origin is outside the magmatic system), antecrysts (if they crystallized earlier in the same magmatic system) or autocrysts (if they crystallize in the final magmatic batch), Detailed U-Pb geochronology has provided evidence (Schaltegger et al., 2009, Earth Planet. Sci. Lett. 286, 208-218) for the presence of antecrystic zircon in most rocks of the Southern Adamello batholith and allows estimation of the durations of crystallization over several 100'000's of years. Oxygen isotopes in zircon are very resistant to suprasolidus or subsolidus re-equilibration; they may preserve information about the earlier melt phase, from which these antecrystic zircons crystallized.
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