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Crustal growth processes: an integrated field and geochemical approach

English title Crustal growth processes: an integrated field and geochemical approach
Applicant Müntener Othmar
Number 135511
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 Other disciplines of Earth Sciences
Start/End 01.06.2011 - 30.09.2014
Approved amount 355'048.00
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All Disciplines (2)

Discipline
Other disciplines of Earth Sciences
Geochemistry

Keywords (6)

Lower crust; thermal evolution; timescales of layer formation; high precision dating; intraplutonic contacts; igneous petrology

Lay Summary (English)

Lead
Lay summary

I propose a combinedfield (Ivrea, Italy and Sierra Nevada, California), detailed analytical and modelling study on the formation of layeredcomplexes and igneous layering formation on plutonic rocks, to get constraintson the emplacement mechanisms and rates of magma injection in the deep crustand along interplutonic contacts. Since the thermal budget added to the crustby crystallizing plutonic rocks depends on the emplacement mechanisms andvolumes of magmas, understanding how magmatic layering along interplutoniccontacts forms and how external parameters such as density, fertility, crystalcargo and viscosity influence the accretion mechanics of dikes and sills, thestudy of deep seated intrusions close to the Moho and subsequent extractionchannels are crucial to the understanding of the magmatic construction of the continental crust. 

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Melt Extraction Zones in Shallow Arc Plutons: Insights from Fisher Lake Orbicules (Sierra Nevada, Western USA)
Anders McCarthy, Othmar Müntener, Anne-Sophie Bouvier, Lukas Baumgartner (2016), Melt Extraction Zones in Shallow Arc Plutons: Insights from Fisher Lake Orbicules (Sierra Nevada, Western USA), in Journal of Petrology, 2011.
Ancient depletion and mantle heterogeneity: Revisiting the Permian and Jurassic paradox of Alpine peridotites
McCarthy Anders Müntener Othmar (2015), Ancient depletion and mantle heterogeneity: Revisiting the Permian and Jurassic paradox of Alpine peridotites, in Geology, G36340.
Geologischer Atlas der Schweiz, 1233 Greina, Erläuterung, 79pp.
Vögeli S. Galster F. and Wiederkehr M. (2015), Geologischer Atlas der Schweiz, 1233 Greina, Erläuterung, 79pp., Officefédéral de topographie swisstopo, Bern.
Geologischer Atlas der Schweiz, Blatt 1233 Greina.
Wiederkehr Michael, Galster Federico (2015), Geologischer Atlas der Schweiz, Blatt 1233 Greina., Office fédéral de topographie, Swisstopo., Bern.
Wiederkehr, M. and Galster, F. (2015) Geologischer Atlas der Schweiz, Blatt 1233 Greina.
Galster Federico (2015), Wiederkehr, M. and Galster, F. (2015) Geologischer Atlas der Schweiz, Blatt 1233 Greina., Office fédéral de topographie, Swisstopo., Bern.
Quaternary Sanukitoid-like Andesites Generated by Intracrustal Processes (Chacana Caldera Complex,Ecuador):Implications for Archean Sanukitoids
Chiaradia Massimo Müntener Othmar Beate Bernardo (2014), Quaternary Sanukitoid-like Andesites Generated by Intracrustal Processes (Chacana Caldera Complex,Ecuador):Implications for Archean Sanukitoids, in Journal of Petroloy, 769.
A detailed geochemical study of a shallow, arc-related laccolith: the Torres del Paine mafic complex, Patagonia.
Leuthold Julien, Müntener Othmar, Baumgartner Lukas, Putlitz Benita, Chiaradia Massimo (2013), A detailed geochemical study of a shallow, arc-related laccolith: the Torres del Paine mafic complex, Patagonia., in Journal of Petrology, 54(2), 273-303.
A case for hornblende dominated fractionation of arc magmas: the Chelan Complex (Washington Cascades)
Dessimoz Mathias, Othmar Müntener, Peter Ulmer (2012), A case for hornblende dominated fractionation of arc magmas: the Chelan Complex (Washington Cascades), in Contributions to Mineralogy and Petrology, 163, 567-589.

Collaboration

Group / person Country
Types of collaboration
USGS United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
University of South Carolina United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
AGU FAll meeting, session convener, and oral contributions Talk given at a conference An experimental perspective on lower crustal processing of (arc) magmas 06.12.2013 San Francisco, United States of America Müntener Othmar;
Swiss Geoscience meeting 2013 Talk given at a conference various titles 30.11.2013 Lausanne, Switzerland Galster Federico; Mac Carthy Anders; Müntener Othmar;
Goldschmidt conference Prag 2011 Talk given at a conference Fitzroy dating 15.08.2011 Prag, Tokelau Müntener Othmar;


Associated projects

Number Title Start Funding scheme
156421 Magmatic processes in the continental crust: from source variations to emplacement mechanisms 01.10.2014 Project funding (Div. I-III)
120054 Crustal growth processes: an integrated field and experimental approach on calc-alkaline magmas 01.04.2008 Project funding (Div. I-III)
120054 Crustal growth processes: an integrated field and experimental approach on calc-alkaline magmas 01.04.2008 Project funding (Div. I-III)

Abstract

This proposal requests funding for three years of combined field, analytical and modeling work on layered plutonic rocks. The grant will support Othmar Müntener, and the field and analytical expenses of two PhD students.I propose a combined field, detailed analytical and modelling study on the formation of layered complexes and igneous layering formation on plutonic rocks, to get constraints on the emplacement mechanisms and rates of magma injection in the deep crust and along interplutonic contacts. Since the thermal budget added to the crust by crystallizing plutonic rocks depends on the emplacement mechanisms and volumes of magmas, understanding how magmatic layering along interplutonic contacts forms and how external parameters such as density, fertility, crystal cargo and viscosity influence the accretion mechanics of dikes and sills, the study of deep seated intrusions close to the Moho and subsequent extraction channels are crucial to the understanding of the magmatic construction of the crust.Ongoing studies in our group on the shallow emplacement of sill complexes in Torres del Paine and the formation of plutons in the Adamello massif (Italy) have shown that emplacement of mafic to granitic magmas preferentially occurs in small volumes and mostly in sills - and in exceptional cases the temporal evolution can be deciphered. One of the largest and well studied layered complexes of mafic magmas (the Ivrea zone) is thought to be formed by crystallization from a small magma chamber and subsequent high-temperature flow of partially crystallized mafic rocks away from the chamber (Gabbro glacier model, Quick and Denlinger 1992). Yet the time integrated geochemical evolution and the available age data indicate high temperature conditions prevailing for several 10’s of millions of year. This model is different from the one proposed for shallower systems. Recent thermal models that requires repetitive sill intrusions to produce substantial heating and partial melting of the lower crust are an alternative explanation for the emplacement of large plutonic bodies at the crust mantle boundary.We propose to study in detail the phase petrology and geochemistry of lower crustal mafic rocks and its intercalated crustal rocks in well-defined natural system (Ivrea zone, Italy), to identify thermal constraints from within the intrusion and on its borders. These data will be used to develop a thermal model that in turns allow to provide quantitative constraints on the melt fraction that might be extracted from such bodies. These constraints can then be tested by using existing field data. The intermediate to silicic magmas rise to construct plutons in intermediate to upper crustal levels. How they rise, via diapirs, dikes or a combination of both is debatable. We propose to study in detail such melt extraction channels (schlieren and comb-layering) along intra-plutonic contacts. In particular, we evaluate the potential of H2O saturation during a late stage of crystallization, as a mechanism for the formation of such magma extraction channelsIn order to achieve this, we will sample mafic rocks and intercalated metasedimentary units in the Ivrea zone [Italy], and layered diorititc to gabbroic rocks from the Sierra Nevada [California, USA], and Adamello [Alps] to establish: (a) the potential of novel trace element thermometers (Zr-in rutile, Ti in zircon) and chronometers (U-Pb lead in rutile, zircon) to obtain peak temperatures of crustal rocks within mafic magmas and in the immediate surrounding rocks. (b) use these data, together with phase relations of mafic rocks to build a thermal model that provides quantitative constraints on the amount of residual liquids and liquids that might be produced by partial melting of surrounding rock (PhD 1). These studies will be complemented by studies on intra-plutonic schlieren and comb-layering, as spectacularly exposed in Adamello (Italy) and the Sierra Nevada (California). Phase petrology and crystal size distributions will be used to identify the key parameters that generate such intraplutonic contacts. We will test current models that such extraction channels are H2O-rich or even H2O saturated (PhD 2). During the current project we will focus on detailed field work, phase petrology, geochemistry, dating and thermal modeling. I propose to start this project with SNF grants for 3 years, with two Ph.D. students, in collaboration with international and national co-workers (Prof. J. Blundy, Bristol, Dr. C. Annen, Bristol, Prof. U. Schaltegger, Geneva, Dr. T. Müller, Bochum) and several colleagues from Lausanne. Two Ph.D. students should make an integral part of the project.
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