GD5.1 | Magmatic, tectonic and hydrothermal processes at mid-oceanic ridges and transform faults: new insights from observations, experiments and numerical modelling
EDI
Magmatic, tectonic and hydrothermal processes at mid-oceanic ridges and transform faults: new insights from observations, experiments and numerical modelling
Co-organized by TS2
Convener: Philipp Brandl | Co-conveners: Marcia Maia, Eleonora Ficini, Antoine DemontECSECS, Florent Szitkar
Orals
| Mon, 15 Apr, 08:30–12:30 (CEST)
 
Room -2.47/48
Posters on site
| Attendance Tue, 16 Apr, 10:45–12:30 (CEST) | Display Tue, 16 Apr, 08:30–12:30
 
Hall X2
Orals |
Mon, 08:30
Posters on site
Tue, 10:45
Relative motions at plate boundaries allow the Earth’s crust to compensate forces driven by global plate tectonics. Mid-oceanic ridges (MORs) provide the unique opportunity to study two of the three plate boundaries: divergent at the ridge axis and strike-slip at transform faults (off-setting the ridge axis). Knowledge of the active and past processes building and altering the oceanic lithosphere has increased over the past 20 years due to advances in deep sea research technologies and numerical modelling techniques. Yet, several questions remain open, such as the relative role of magmatic, tectonic and hydrothermal processes in the formation of the oceanic lithosphere at the ridge axis, especially at slow and ultra-slow spreading ridges and at their intersection with transform faults. Transform faults and their extension into fracture zones, for example, remain largely under-studied features. For a long time, they were considered as cold and inactive; however, evidence for magmatism emerged recently inside both features. Given the complex network of faults associated with these structures, they represent ideal pathways for hydrothermal percolation into the Earth’s lithosphere and may therefore play a significant role in the chemical and the thermal budget of the planet, as well as in the chemical exchange with the ocean (e.g., nutrients). This session aims at fostering the scientific exchange across all disciplines studying mid-oceanic ridge axes, transform faults and fracture zones. Studies building on the use of cutting-edge deep-sea research technology are particularly welcome. The session also welcomes recent developments in thermo-mechanical models, which integrate geophysical and geological data with numerical modelling tools, bridging the gap between observations and numerical models.

Orals: Mon, 15 Apr | Room -2.47/48

Chairpersons: Philipp Brandl, Marcia Maia, Florent Szitkar
08:30–08:35
5-minute convener introduction
09:35–09:45
Discussion
EGU24-11890
|
ECS
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On-site presentation
Continental slivers in oceanic transform faults controlled by tectonic inheritance
Attila Balázs et al.
10:05–10:15
Discussion
Coffee break
Chairpersons: Eleonora Ficini, Antoine Demont, Philipp Brandl
EGU24-10653
|
On-site presentation
Mercury fluxes from hydrothermal venting at mid-ocean ridges constrained by measurements
Lars-Eric Heimbürger-Boavida et al.
EGU24-2122
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ECS
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On-site presentation
Oxide gabbro: from detachment/transform faults to subduction.
Thomas Gyomlai and Cecile Prigent
12:25–12:30
Final Discussion

Posters on site: Tue, 16 Apr, 10:45–12:30 | Hall X2

Display time: Tue, 16 Apr 08:30–Tue, 16 Apr 12:30
Chairpersons: Philipp Brandl, Eleonora Ficini, Marcia Maia
EGU24-13004
|
ECS
|
On-site presentation
Evolution history of the Knipovich-Mohns ridge intersection (Artic Ocean) during the last 20 Ma
Eleonora Ficini et al.
EGU24-22147
|
ECS
|
OSPP
|
On-site presentation
Interpretation of a second-order discontinuity at 1°N latitude of the Mid-Atlantic Ridge
Raissa Francicleide Sousa da Silva et al.
EGU24-21861
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ECS
|
OSPP
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On-site presentation
Local seismicity surrounding the Atobá Ridge in the slow-slipping St. Paul transform system, equatorial Atlantic
Guilherme Weber Sampaio de Melo et al.
EGU24-4461
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ECS
|
On-site presentation
Global variations in the dip geometry of oceanic transform faults
Alexandre Janin et al.
EGU24-17326
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On-site presentation
Fault scarps and tectonic strain in young seafloor
Mathilde Cannat et al.
EGU24-15593
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On-site presentation
Modes of detachment faulting at slow and ultraslow mid-oceanic ridges
Antoine Demont et al.
EGU24-17664
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ECS
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On-site presentation
More magmatic versus less magmatic oceanic detachment fault zone anatomy
Souradeep Mahato and Mathilde Cannat