Project

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Dynamic thermo-mechanical evolution of the contact aureole

English title Dynamic thermo-mechanical evolution of the contact aureole
Applicant Baumgartner Lukas P.
Number 123081
Funding scheme ProDoc
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochemistry
Start/End 01.05.2009 - 31.05.2013
Approved amount 499'647.00
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All Disciplines (4)

Discipline
Geochemistry
Geochronology
Other disciplines of Earth Sciences
Geophysics

Keywords (10)

metamorphism; contact aureole; kinetics of mineral reactions; thermo-barometry; contact metamorphism; mineral growth; deformation; thermal modeling; intrusion mechanism; thermometery

Lay Summary (English)

Lead
Lay summary
The ProDoc initiative "Adamello 4D" strives to develop insights in the 4D (time-space) evolution of the largest Tertiary batholith in the Alps. The Adamello is a composite intrusion, which intruded at relatively shallow crustal levels (4-10 km).
New metamorphic and structural data will be collected and combined with existing structural, metamorphic, mineralogical and petrological data available in a series of PhD and Master publications which were conducted over the last 30 years mainly at the ETH in Zürich, but which are mostly unpublished. The goal is to obtain a) a batholith scale thermal model and b) detailed relative timing and mechanical constraints to build an overall thermo-mechanical model for the aureole.
The proposal consists of 2 parts: a large-scale metamorphic study on meta-pelites of the basement and meta-sandstones of Permo-Carboniferous age from the north-central parts of the Eastern and Western contacts (project A) and a mechanistic study aimed at understanding metamorphic textural evolution of these rocks (project B). Special attention will be directed towards identifying equilibrium - or the lack thereof - with the aim of applying existing thermo-barometers and interpreting the results that will be obtained with the necessary mechanistic considerations.
Permian Sandstones of the Adamello contact aureole are well known to contain inclusion rich several millimeter sized biotite and cordierite crystals, surrounded by depletion halos. We also found highly dendritic andalusite crystals. These crystal textures will allow us to address mobility of chemical components during metamorphism, and to assess the degree of disequilibrium between the metamorphic crystals. This information will be combined with thermometry estimates to obtain a quantitative estimation of the accuracy of thermometric results.
Initial studies in the contact aureole confirm the highly variable a complicated contact relationship between the host rock and the different intrusive bodies. We will use mineral lattice orientation measurements (EBSD, AMS) combined with phase petrology to determine the relative timing of deformation, heating and cooling in the aureole of the Adamello tonalite, the Re di Castello tonalite and related mafic intrusions to establish the deformation-temperature history.
The results will be integrated with results from the other modules of the Pro-Doc program. In this way we will be able to understand the movement of magmas through the upper crust. We will obtain a quantitative estimation of the importance of heat and mass transport, and quantify the deformation associated with such intrusions.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
An observational and thermodynamic investigation of carbonate partial melting
Floess David, Baumgartner Lukas P, Vonlanthen Pierre (2015), An observational and thermodynamic investigation of carbonate partial melting, in Earth and Planetary Science Letters, 409, 147.
Constraining magmatic fluxes through thermal modelling of contact metamorphism
Floess David, Baumgartner Lukas P (2015), Constraining magmatic fluxes through thermal modelling of contact metamorphism, in Geological Society of London Special Publications, 422, 41.
Formation of garnet clusters during polyphase metamorphism
Floess David, Baumgartner Lukas P (2013), Formation of garnet clusters during polyphase metamorphism, in Terra Nova, 25(2), 144.
Field Guide to the Torres del Paine Igneous Complex and its Contact Aureole
Baumgartner Lukas, Putlitz Benita, Bodenr Robert, Leuthold Julien, Michel J. Robyr M., Müntener Othmar, Michel Jürgen (2012), Field Guide to the Torres del Paine Igneous Complex and its Contact Aureole, ISTE, Lausanne.
Field Guide For Post-Conference Field Trip B: Val Saviore
Floess David, Baumgartner Lukas, Field Guide For Post-Conference Field Trip B: Val Saviore.

Collaboration

Group / person Country
Types of collaboration
Prof. Dr. Urs Schaltegger Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Dr. Othmar Müntener Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. Benita Putlitz Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

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