Union-wide
Inter- and Transdisciplinary Sessions
Disciplinary sessions AS–GM
Disciplinary sessions GMPV–TS

Session programme

GD4

GD – Geodynamics

Programme group chair: Paul Tackley

GD4 – Crust, Lithosphere and Asthenosphere: Observations and Models

GD4.1

Structure and dynamics of the lithosphere-asthenosphere system is one of the key questions for understanding geological processes. Constraining the styles, mechanisms and fabrics evolution in the crust and the upper mantle come from both direct and indirect observations with the use of variety of methods. Seismological studies focusing on anisotropy have successfully improved our knowledge of deformation patterns, acting both at present as well as in the past. When combined with tomographic models, velocity anisotropy can shed light on the geometry, structure, and dynamics of deformation in the lithosphere and the asthenosphere. Sophisticated geodynamic modelling and laboratory experiments enhance our understanding of flow patterns in the upper mantle and their effects on vertical motions of the crust and the lithosphere. Combining with inferences from seismic anisotropy, these methods have the potential to reveal mechanisms that create deformation-induced features such as shape preferred orientation (SPO) and lattice-preferred orientation (LPO), which created in the past or during the last deforming processes. Structural and kinematic characterization of deformation events by geometric and kinematic analyses infer the direction and magnitude of the tectonic forces involved in driving deformation within crust and upper mantle. Additionally, both physical analogue and numerical modelling foster our understanding of complex 3D-plate interaction on various timescales, controlled through the degree of plate coupling and the rheology of the lithosphere.
However, additional work is required to better integrate various experimental and modelling techniques, and to link them with multi-scale observations. The session aims at bringing together inferences from different disciplines that focus on structure and deformation of the lithosphere and the sub-lithospheric upper mantle as well as on the dynamics and nature of the lithosphere-asthenosphere system. The main goal is to demonstrate the potential of different methods, and to share ideas of how we can collaboratively study lithosphere structure, and how the present-day fabrics of the lithosphere relates to the contemporary deformation processes and ongoing dynamics within the asthenospheric mantle. Contributions from studies employing seismic anisotropy observation, geodynamical modelling (analogue and numerical), structural geology, and mineral and rock physics are welcome.

Invited Speakers:
Eric Debayle (Laboratoire de Geologie de Lyon-Terre, Planètes, Environnement, CNRS, France)
Christof Völksen (Bayerische Akademie der Wissenschaften, Germany)

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Co-organized by SM4/TS14
Convener: Ehsan Qorbani ChegeniECSECS | Co-conveners: Irene Bianchi, Boris Kaus, Jaroslava Plomerova, Ernst Willingshofer
Displays
| Attendance Mon, 04 May, 08:30–10:15 (CEST)
GD4.2

International Lithosphere Program (ILP) has since 1980 been initiating major international, multidisciplinary research programmes to elucidate the nature, dynamics, origin and evolution of the lithosphere. ILP has taken initiative to more than 70 programmes within its four research themes: (1) Geoscience of Global Change, (2) Contemporary Dynamics and Deep Processes, (3) Continental Lithosphere and (4) Oceanic Lithosphere. Example programmes initiated by ILP include World Stress Map, Global Strain Rate Map, Global Seismic Hazard Assessment Map, Seismic Hazards and Megacities, Global Impact project, International Continental Drilling Program (ICDP), and a series of Global Geoscience Transects and programmes. Present programmes focus on integrated mapping of lithosphere physical parameters, lithosphere dynamics including the fate of subducted lithosphere and deformation of continental lithosphere, response of the lithosphere to surface processes including changes in climate and erosion/deposition dynamics, mineral resources, and seismic risk. ILP promotes high class science in combination with community services through the Evgueni Burov medal for mid-career scientists and the Flinn-Hart Award for outstanding early-career scientists, which are awarded during the UGU annual meeting. The activities of ILP seeks to achieve a balance between: "addressing societal needs" in regard to e.g. natural catastrophes, resource exploration and environmental protection; and "satisfying scientific curiosity" in regard to global and regional processes affecting the lithosphere. This symposium presents some of the ILP activities.
In particular, we invite, in particular multidisciplinary, contributions which focus on the structure and evolution of the continental crust and upper mantle and on the nature of mantle discontinuities. The latter include, but are not limited to, the mid-lithosphere discontinuity (MLD), the lithosphere-asthenosphere boundary (LAB), and the mantle transition zone, as imaged by various seismological techniques and interpreted within interdisciplinary approaches. Papers with focus on the structure of the crust and the nature of the Moho are also welcome. Methodologically, the contributions will include studies based on seismic, thermal, gravity, petrological, and/or electro-magnetic data interpretations.

Confirmed invited speakers: Sierd Cloetingh, Harsh Gupta, Sergei Lebedev and Taras Gerya.

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Co-organized by SM4/TS11
Convener: Alexey Shulgin | Co-conveners: Hans Thybo, Leni Scheck-Wenderoth, Alexander Rudloff, Lev Vinnik
Displays
| Attendance Tue, 05 May, 14:00–15:45 (CEST)
GD4.3

The origin and evolution of the continental lithosphere is closely linked to changes in mantle dynamics through time, from its formation through melt depletion to multistage reworking and reorganisation related to interaction with melts formed both beneath and within it. Understanding this history is critical to constraining terrestrial dynamics, element cycles and metallogeny. We welcome contributions dealing with: (1) Reconstructions of the structure and composition of the lithospheric mantle, and the influence of plumes and subduction zones on root construction; (2) Interactions of plume- and subduction-derived melts and fluids with continental lithosphere, and the nature and development of metasomatic agents; (3) Source rocks, formation conditions (P-T-fO2) and evolution of mantle melts originating below or in the mantle lithosphere; (4) Deep source regions, melting processes and phase transformation in mantle plumes and their fluids; (5) Modes of melt migration and ascent, as constrained from numerical modelling and microstructures of natural mantle samples; (6) Role of mantle melts and fluids in the generation of hybrid and acid magmas.These topics can be illuminated using the geochemistry and fabric of mantle xenoliths and orogenic peridotites, mantle-derived melts and experimental simulations.

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Co-organized by GMPV4, co-sponsored by EAG
Convener: Igor Ashchepkov | Co-conveners: Sonja Aulbach, Kate Kiseeva, Evgenii Sharkov
Displays
| Attendance Tue, 05 May, 08:30–12:30 (CEST)
GMPV9.5

The session deals with the documentation and modelling of the tectonic, deformation, and geodetic features of any type of volcanic area, on Earth and in the Solar System. The focus is on advancing our understanding on any type of deformation of active and non-active volcanoes, on the associated behaviours, and the implications for hazards. We welcome contributions based on results from fieldwork, remote-sensing studies, geodetic and geophysical measurements, analytical, analogue and numerical simulations, and laboratory studies of volcanic rocks. We also welcome multidisciplinary studies, especially those that integrate data collected at different scales (e.g. laboratory and field data).
Studies may be focused at the regional scale, investigating the tectonic setting responsible for and controlling volcanic activity, both along divergent and convergent plate boundaries, as well in intraplate settings. At a more local scale, all types of surface deformation in volcanic areas are of interest, such as elastic inflation and deflation, or anelastic processes, including caldera and flank collapses. Deeper, sub-volcanic deformation studies, concerning the emplacement of intrusions, as sills, dikes, and laccoliths, are most welcome.
We also particularly welcome geophysical data aimed at understanding magmatic processes during volcano unrest. These include geodetic studies obtained mainly through GPS and InSAR, as well as studies that model these data to image sources.


The session includes, but is not restricted to, the following topics:
• volcanism and regional tectonics;
• formation of magma chambers, laccoliths, and other intrusions;
• dyke and sill propagation, emplacement, and arrest;
• earthquakes and eruptions;
• caldera collapse, resurgence, and unrest;
• flank collapse;
• volcano deformation monitoring;
• volcano deformation and hazard mitigation;
• volcano unrest;
• mechanical properties of rocks in volcanic areas.

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Co-organized by GD4/NH2/TS13
Convener: Valerio Acocella | Co-conveners: Agust Gudmundsson, Michael Heap, Sigurjon Jonsson, Virginie Pinel
Displays
| Attendance Fri, 08 May, 14:00–15:45 (CEST), Attendance Fri, 08 May, 16:15–18:00 (CEST)
GMPV7.1

From the Archean to the present, the dynamic evolution of the lithosphere is preserved in the metamorphic rock record. Each piece of evidence on mineral reactions, deformation and fluid-rock interaction helps to reconstruct the puzzle of lithospheric tectonics in all its complexity. Analytical and conceptual innovations in petrology, geochemistry, chronology, structural analysis and thermodynamic/thermomechanical modelling continue to improve our ability to read the metamorphic rock record and open new avenues for future development.

This session will highlight research in integrated metamorphic petrology and its application to solid earth behaviour in orogens, subduction zones and cratons throughout geological time. We welcome contributions across the breadth of this field—from petrology, (petro-)chronology, trace-element and isotope geochemistry to microstructures, modelling and geodynamics—with a focus on metamorphic and metasomatic processes that shape the lithosphere across a range of scales.

Invited speakers: Sarah Incel (University of Oslo), Richard Palin (University of Oxford) 

Public information:
We will have relatively few presentations in the 2nd slot, so we will transfer the last few of our 1st-slot presentations there (if authors are OK). This way we will have more time for further great discussions!

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Co-organized by GD4/TS2
Convener: Matthijs Smit | Co-conveners: Daniela Rubatto, Tom Raimondo, Lucie Tajcmanova, Francesca PiccoliECSECS, José Alberto Padrón-Navarta, Carla TiraboschiECSECS
Displays
| Attendance Wed, 06 May, 14:00–18:00 (CEST)
TS11.3

Seismic data analysis and interpretation is the key tool enabling the unravelling of the geometry and evolution of subsurface geology.
In the last decades, significant improvements in the acquisition and processing techniques have been combined with a growing coverage of high-resolution and broadband frequency seismic data, including the public release of large volumes of 2D-3D hydrocarbon industry-sourced data. This led to shedding genuine new light on the subsurface geology of large portions of the Earth’s continental margins, and enabled improved quantitative rock property parametrization.
In addition, seismic reflection data have recently appealed to an ever-growing scientific audience, including exploration geoscientists, marine geologists, seismic geomorphologists, stratigraphers and structural geologists. This growing community has been collectively working towards the integrated application of seismic interpretation techniques, including seismic attribute analysis, for industrial purposes as well as for environmental and academic research studies.
In this fast-developing context, it is fundamental to share the knowledge between different research and application approaches. Therefore, the aim of this session is to provide the state-of-the-art and new prospective in seismic data analysis and quantitative subsurface characterization for structural geology and tectonics, but also for exploration seismology, marine geology, seismic geomorphology, stratigraphy, etc.
We thus invite submissions that aim to present new insights in the seismic interpretation of: i) shallow high-resolution seismic data; ii) deep industrial subsurface data (e.g., for hydrocarbon exploration); and iii) ultra-deep lithospheric seismic data. Studies integrating different approaches and disciplines are particularly welcomed.

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Co-organized by GD4/SM4/SSP2
Convener: Vittorio Scisciani | Co-convener: Stefano PatrunoECSECS
Displays
| Attendance Fri, 08 May, 08:30–10:15 (CEST)
TS1.1

Temperature is a critical parameter in sedimentary basin evolution. Its distribution through time and space highly contributes to address complex geodynamic topics in different settings through realistic thermal history reconstructions. Conventional thermal modeling constraints derived from the inorganic and organic fraction of sedimentary rocks (vitrinite %Ro, apatite fission-tracks, fluid inclusions, etc.) can be affected by important limitations.
Moreover, fluids circulation in fault zones and sediments is often disregarded. In the last years new modelling approaches, innovative thermo-chronology proxies (carbonate clumped isotopes thermometry coupled with laser ablation U-Pb chronometry) as well as Raman and FT-IR on organic matter and biomarker studies have been widely used to overcome these pitfalls. Aim of the session is to provide a worldwide panorama on sedimentary basins whose geodynamic evolution has been constrained by merging conventional and brand-new calibration techniques and thermal modelling approaches. Contributions on different scale mechanisms, also dealing with uncertainties of fluids and technique validation are warmly welcome and would allow for discussion on technique development and presentation of new pilot data.

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Co-organized by GD4/SSP1
Convener: Andrea SchitoECSECS | Co-conveners: Sveva Corrado, Marta Gasparrini, Dave Muirhead, Silvia Omodeo SalèECSECS
Displays
| Attendance Wed, 06 May, 10:45–12:30 (CEST)