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Miocene intrusions in Southern Patagonia - contact-metamorphism and deformation at the Fitz Roy Plutonic Complex (Patagonia, Argentina)

English title Miocene intrusions in Southern Patagonia - contact-metamorphism and deformation at the Fitz Roy Plutonic Complex (Patagonia, Argentina)
Applicant Putlitz Benita
Number 150078
Funding scheme Project funding (Div. I-III)
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochemistry
Start/End 01.11.2013 - 31.12.2015
Approved amount 174'770.00
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Keywords (7)

trace-element thermometry; deformation; oxygen isotope diffusion; Patagonia; contact-metamorphose; thermal modeling; ion-probe (SwissSIMS)

Lay Summary (German)

Lead
Wir untersuchen am Beispiel eines plutonischen Körpers in Patagonien - dem sog. Chaltén Plutonic Complex - die Platznahme und die genauen Mechanismen der Platznahme magmatischer Körper. Neue Information zu diesem Thema können auf lange Sicht zu einem besserem Verständnis über die Bildung von Erzlagerstätten und dem Gefahrenpotential von Vulkanen führen.
Lay summary

Unser Arbeitsgebiet ist der sogenannte Chaltén Plutonic Complex (CHPC) an der chilenischen-argentinischen Grenze in Patagonien. Es handelt sich hier um einen plutonischer Körper, der sich aus verschiedensten Intrusivgesteinen vom Granite bis zum Ultramafit zusammensetzt. Wir konnten zeigen, dass dieser relativ kleine Plutonit wichtige Informationen zur Verständnis der Tektonik in Patagonien liefert.

Basierend auf diesen Vorarbeiten wenden wir uns nun der metamorphen Ueberprägung (Kontaktmetamorphose) und der Deformation der Nebengesteine zu mit dem Ziel die Platznahme und den Mechanismus der Platznahme des CHCP und, damit solcher plutonischen Körper im Allgemeinen besser zu verstehen. Dabei sind besonders an der Temperaturentwicklung der Nebengesteine des CHPC interessiert. Im Detail werden wir die Anwendung neuer thermometrischer Methoden testen vor allem die Diffusion von Spurenelementen (z.B. das Verhalten von Titanium in Quarz) und Isotopen im Besonderen Sauerstoffisotopen. Wir versuchen die Wechselwirkung der Einflüsse von Temperatur und Deformation auf das Diffusionsverhalten zu verstehen. Unsere Arbeitsmethoden umfassen Kartierung und Probennahme im Gelände, die klassische petrologische und geochemische Analytik und theoretische Modellierungen, sowie die Anwendung modernster Techniken z.B. die Benutzung der Ionensonde (SwissSIMS).

Die Platznahme magmatischer Körper und der Mechanismen ihrer Platznahme sind nicht nur seit langem in der wissenschaftlichen Diskussion, sie sind auch von gesellschaftlichem Interesse, und neue Informationen kann auf lange Sicht zu einem besserem Verständnis zur Bildung von Erzlagerstätten und dem Gefahrenpotential von Vulkanen führen.

 

Direct link to Lay Summary Last update: 23.10.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Short magmatic residence times of quartz phenocrysts in Patagonian rhyolites associated with Gondwana break-up
SeitzS. Putlitz B. Baumgartner L.P. Escric S. Meibom A. Bouvier A.-S (2016), Short magmatic residence times of quartz phenocrysts in Patagonian rhyolites associated with Gondwana break-up, in Geology, 40(1), 67-70.

Collaboration

Group / person Country
Types of collaboration
Prof. Anders Meibom Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. C. Ramirez Chile (South America)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Torsten Vennemann Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. Anne-Sophie Bouvier Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Stephane Escrig Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Lukas Baumgartner Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Othmar Müntener Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
International Geological Congress on the Southern Hemisphere Talk given at a conference Partial melting and deformation of rhyolites in the contact-aureole of the Chaltén Plutonic Complex (Co. Fitz Roy, Patagonia, Argentina). 25.04.2016 Vina del Mar,, Chile Putlitz Benita;
AGU Fall Meeting Talk given at a conference Phenocryst residence times and the life time of a feeder zone – evidence from diffusion chronometry and contact metamorphism 14.12.2015 San Francis, United States of America Seitz Susanne; Putlitz Benita;
12 Swiss Geoscience Meeting Talk given at a conference Trace element diffusion in quartz-phenocrysts from a Jurassic meta-rhyolite: constraints from the contact-aureole of the Chaltén Plutonic Complex (Fitz Roy, Patagonia) 21.11.2015 Fribourg, Switzerland Putlitz Benita; Seitz Susanne;
13th Swiss Geoscience meeting Poster A NanoSIMS study on quartz phenocrysts 20.11.2015 Basel, Switzerland Putlitz Benita; Seitz Susanne;
GSA Talk given at a conference A NanoSIMS study: Magma storage as recorded in quartz phenocrysts from a large silicic province (Patagonia, Argentina). 01.11.2015 Baltimore, United States of America Seitz Susanne; Putlitz Benita;
AGU Fall Meeting Talk given at a conference Titanium and oxygen isotope diffusion in quartz-phenocrysts from a Jurassic rhyolite, Chon Aike Province (Fitz Roy, Patagonia). 15.12.2014 San Fransicso, United States of America Seitz Susanne; Putlitz Benita;
15th TSK Talk given at a conference Oxygen isotope and Ti diffusion in quartz: constraints from the contact-aureole of the Chaltén Plutonic Complex (Fitz Roy, Patagonia). 31.03.2014 Potsdam, Germany Putlitz Benita; Seitz Susanne;
11th Swiss Geoscience Meeting Poster esche, S., Nescher, P. 2013 (poster): Oxygen isotope and trace element behavior in rhyolites from the contact-aureole of the Chaltén Plutonic Complex (Mt. Fitz Roy, Patagonia, Argentina). 15.11.2013 Lausanne, Switzerland Seitz Susanne; Putlitz Benita;


Associated projects

Number Title Start Funding scheme
126960 Miocene intrusions in Southern Patagonia - contact-metamorphism and deformation at the Fitz Roy plutonic complex (Patagonia, Argentina) 01.01.2010 Project funding (Div. I-III)

Abstract

I propose a study of the contact-metamorphism and deformation associated with the Fitz Roy Plutonic Complex and its contact aureole. The Fitz Roy or Chaltén Plutonic Complex (CHPC) is located in Patagonia at the frontier between Chile and Argentina. It belongs to a group of small Miocene intrusions, which have a transitional position between the Patagonian Batholith and the recent volcanic arc in the West and the basaltic plateau lavas in the East. The PhD thesis completed in the previous grant period (Ramirez, 2011) produced a wealth of new data which allow us now to the characterize the intrusive body in terms (1) the geometry of the intrusion (2) the high precision age data for the intrusion resulting in the intrusion sequence within CHPC (3) crystallisation depth and temperatures. Geochemical, age data, regional geology data clearly showed that the intrusion is related to arc migration, and that no genetic relationship exists with the Chile ridge subduction, in contrast to what was proposed in the literature (Ramirez et al. 2012). The PhD thesis of Susanne Seitz started in January 2012. She has focused on the contact-metamorphism and deformation in the Chaltén Plutonic Complex and it host rocks with the aim to better understand the emplacement mechanism and its tectonic context. The intrusion post-dated major regional deformation due to the Andean foreland fold and thrust belt. Based on our previous reseach results, we propose to address the following aspects: a) importance of intrusion related deformation for emplacement mechanism; b) distribution and origin of partial melting of rhyolites in the contact zone and its influence on intrusion mechanics; c) how reliable can trace element thermometry (Ti in quartz and in zircon) be used to establish thermal peak temperatures; d) how can Ti in quartz be used to establish deformation sequence in the CHCP and host rocks; and finally e) how can diffusion of oxygen in quartz phenocrysts of the contact metamorphic rhyolites be used to constrain oxygen isotope exchange during prograde and retrograde multiple thermal pulses of the CHCP. This study is designed for 26 month and will enable the PhD candidate to successfully finish her thesis. No prolongation of this project is planned.
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