Project

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Numerical modelling of magmatic sources evolution and silicic batholiths emplacement in Alpine-type orogens

English title Numerical modelling of magmatic sources evolution and silicic batholiths emplacement in Alpine-type orogens
Applicant Gerya Taras
Number 123087
Funding scheme ProDoc
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geophysics
Start/End 01.04.2009 - 30.04.2013
Approved amount 436'275.00
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All Disciplines (4)

Discipline
Geophysics
Geochronology
Geology
Geochemistry

Keywords (8)

magmatic intrusions; numerical modeling; subduction; collision; magmatic processes; intrusion emplacement; Adamello batholith; Alpine orogeny

Lay Summary (English)

Lead
Lay summary
Despite recent progress in modeling of magmatic intrusions many important questions related to the origin and dynamics of silicic intrusions in Alpine-type orogens remain unresolved: 1) Which physical parameters define emplacement dynamics and culminate shapes of silicic intrusions in 2D and 3D? 2) How far-field stresses and regional deformation affect intrusive processes in orogenic systems? 3) What are the influences of composition, depth and origin of magmatic source regions on the intrusion process? 4) Which principal tendencies in chemical-thermomechanical magmatic source evolution define petrological and geochemical characteristics of an intruding pluton in time and space? 5) What are similarities and differences in intrusion generation and emplacement processes during subduction and collision stages of orogens? 6) Can subducted rock mélanges provide significant magma sources for silicic batholiths? 7) What are the chemical and structural interferences between subcrustal magmas and the upper mantle and the lower crust? With this project we plan to generate 2D and 3D visco-elasto-plastic coupled petrological-geochemical-thermomechanical numerical models of silicic intrusion emplacement in Alpine-type orogens during subduction and collision stages. We will decipher stable mechanisms of emplacement and unravel the principal physical parameters controlling variations in intrusion geometry and emplacement dynamics in such orogens in two and three dimensions with particular implications to a possible origin and emplacement history of Adamello intrusion. Principal goals of this project are to systematically investigate physical parameters space of regional numerical models of subduction and collision associated with magma segregation and emplacement and find regional conditions for the development of Adamello-type plutons. Based on predictions from regional numerical experiments critical natural tests for discrimination of various geodynamic scenarios will be defined for conducting a set of "modelling-driven observations", thus providing feedback for conducting new, model-inspired research in structural, metamorphic, geochemical and petrological modules of 4D Adamello. On the basis of such analyses initial and boundary conditions will be refined which will result in creating high-resolution numerical model of the Adamello intrusion in space and time. The project will also create a background for broader applications of 4D Adamello scientific deliveries in other places for which we possess data e.g. Bergel intrusion, Ivrea Zone, Himalaya, Rhodope, Sierra Nevada, Patagonia, etc.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Numerical modelling of magma dynamics coupled to tectonic deformation of lithosphere and crust
Keller Tobias, May Dave A., Kaus Boris J. P. (2013), Numerical modelling of magma dynamics coupled to tectonic deformation of lithosphere and crust, in Geophysical Journal International, 195(3), 1406-1442.
Crustal growth at active continental margins: Numerical modeling
Vogt K., Gerya T.V., Castro A., Crustal growth at active continental margins: Numerical modeling, in Phys. Earth Planet. Interiors, 192-193, 1-20.
Dynamical Instability Produces Transform Faults at Mid-Ocean Ridges
Gerya Taras, Dynamical Instability Produces Transform Faults at Mid-Ocean Ridges, in SCIENCE, 329(5995), 1047-1050.
From oceanic plateaus to allochthonous terranes: Numerical modelling
Vogt Katharina, Gerya Taras, From oceanic plateaus to allochthonous terranes: Numerical modelling, in Gondwana Research.
Future directions in subduction modeling
Gerya T., Future directions in subduction modeling, in Journal of Geodynamics, 52(5), 344-378.
Geodynamic regimes of subduction under an active margin: effects of rheological weakening by fluids and melts
Gerya T. V., Meilick F. I., Geodynamic regimes of subduction under an active margin: effects of rheological weakening by fluids and melts, in JOURNAL OF METAMORPHIC GEOLOGY, 29(1), 7-31.
Influences of the buoyancy of partially molten rock on 3-D plume patterns and melt productivity above retreating slabs
Zhu G., Gerya T.V., Honda S., Tackley P.J., Yuen. D.A., Influences of the buoyancy of partially molten rock on 3-D plume patterns and melt productivity above retreating slabs, in Phys. Earth Planet. Interiors, 185, 112-121.
Intraoceanic subduction of “heterogeneous” oceanic lithosphere in narrow basins: 2D numerical modeling
Malatesta C., Gerya T., Scambelluri M., Federico L., Crispini L., Capponi G., Intraoceanic subduction of “heterogeneous” oceanic lithosphere in narrow basins: 2D numerical modeling, in Lithos, 140-141, 234-251.
Intra-oceanic subduction zones
Gerya T., Intra-oceanic subduction zones, in Brown D. (ed.), Springer, Berlin Heidelberg, 23-51.
Introduction to Numerical Geodynamic Modelling
Taras Gerya, Introduction to Numerical Geodynamic Modelling, Cambridge University Press, Cambridge, UK.
Numerical modeling of geochemical variations caused by crustal relamination
Vogt Katharina, Castro Antonio, Gerya Taras, Numerical modeling of geochemical variations caused by crustal relamination, in Geochemistry, Geophysics, Geosystems, 470-487.
Origin and models of oceanic transform faults
Gerya T., Origin and models of oceanic transform faults, in Tectonophysics, 522-523, 34-54.
Subduction of young oceanic plates: A numerical study with application to aborted thermal-chemical plumes
Blanco-Quintero Idael Francisco, Gerya Taras V., Garcia-Casco Antonio, Castro Antonio, Subduction of young oceanic plates: A numerical study with application to aborted thermal-chemical plumes, in GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 12, Q10012.
Three-dimensional dynamics of hydrous thermal-chemical plumes in oceanic subduction zones
Zhu Guizhi, Gerya Taras V., Yuen David A., Honda Satoru, Yoshida Takeyoshi, Connolly James A. D., Three-dimensional dynamics of hydrous thermal-chemical plumes in oceanic subduction zones, in GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 10, Q11006.
Three-dimensional thermomechanical modeling of oceanic spreading initiation and evolution
Gerya Taras V., Three-dimensional thermomechanical modeling of oceanic spreading initiation and evolution, in PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 214, 35-52.

Abstract

Despite recent progress in modeling of magmatic intrusions many important questions related to the origin and dynamics of silicic intrusions in Alpine-type orogens remain unresolved: 1) Which physical parameters define emplacement dynamics and culminate shapes of silicic intrusions in two and three dimensions? 2) How far-field stresses and regional deformation affect intrusive processes in orogenic systems? 3) What are the influences of composition, depth and origin of magmatic source regions on the intrusion process? 4) Which principal tendencies in chemical-thermomechanical magmatic source evolution define petrological and geochemical characteristics of an intruding pluton in time and space? 5) What are similarities and differences in intrusion generation and emplacement processes during subduction and collision stages of orogens?6) Can subducted rock mélanges provide significant magma sources for silicic batholiths? 7) What are the chemical and structural interferences between subcrustal magmas and the upper mantle and the lower crust?With this project we plan to take advantage of recent developments in hardware and software capabilities to generate two- and three-dimensional visco-elasto-plastic coupled petrological-geochemical-thermomechanical numerical models of silicic intrusion emplacement in Alpine-type orogens during subduction and collision stages. This project forms the regional-scale numerical modelling module of the ProDoc school and covers regional geodynamic aspects and possible deep source evolution scenarios for 4D Adamello problem. We will decipher stable mechanisms of emplacement and unravel the principal physical parameters controlling variations in intrusion geometry and emplacement dynamics in such orogens in two and three dimensions with particular implications to a possible origin and emplacement history of Adamello intrusion. Principal goals of this project are to systematically investigate physical parameters space of regional numerical models of subduction and collision associated with magma segregation and emplacement and find regional conditions for the development of Adamello-type plutons. Based on predictions from regional numerical experiments critical natural tests for discrimination of various geodynamic scenarios will be defined for conducting a set of “modelling-driven observations”, thus providing feedback for conducting new, model-inspired research in structural, metamorphic, geochemical and petrological modules of 4D Adamello. On the basis of such analyses initial and boundary conditions will be refined (which will help to create high-resolution numerical models of the Adamello intrusion in space and time - which is the second numerical modelling project of ProDoc “4D Adamello”). Rapid progress in numerical experiments and result delivery must be ensured by parallel employment of two PhD students. One PhD student will be concentrated on intrusion emplacement during subduction and another PhD will focus on intrusion generation and emplacement during post-subduction collision stages. The project will also create a background for broader applications of 4D Adamello scientific deliveries in other places for which we possess data e.g. Bergel intrusion, Ivrea Zone, Himalaya, Rhodope, Sierra Nevada, Patagonia, etc.
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