Communication Dans Un Congrès Année : 2024

T21E-3388 MAPRIDGES: Global Database of Mid-Oceanic Ridge Segments and Transform Faults

Résumé

In spite of being one of the Earth’s major tectonic features, mid-ocean ridges are under-explored and not fully understood. To advance this knowledge, an effort to consistently interpret the geometry of mid-ocean ridges and their segmentation by non-transform offsets vs transform faults at global scale has been recently conducted. With the increasing extent of ship-based high-resolution bathymetry data publicly accessible in addition to a growing body of literature, it is now possible to map in detail the geometry of divergent plate boundaries and their segmentation, along a significant proportion of the mid-ocean ridge system. Published ship-based multibeam swath bathymetry data (100-m resolution or better), is now available for ~25% of the ocean seafloor, but covering most of the mid-ocean ridge system. Seizing the opportunity of the World 5M project supervised by CGMW (Commission for the Geological Map of the World), we publish the MAPRIDGES database, with a first version V1.0 (06/2024; https://doi.org/10.17882/99981). The detailed mapping of individual mid oceanic ridge segments was conducted using the Global Multi-Resolution Topography, GMRT (Ryan et al., 2009) (version 4.2), other publicly available datasets (e.g., NCEI, Pangaea, AWI), and existing literature. The database includes the level of confidence in data interpretation mostly related to the data resolution. As a result, only 12% of all interpreted mid-ocean ridge segments are based on low resolution, satellite-derived topographic data, and thus assigned a low confidence. MAPRIDGES provides detailed, up-to-date interpretation global ridge segmentation (n=1461) and associated transform faults (n=260). This is addition to major ridge offsets accommodated by heterogenous and complex transfer zones (n=10). Our analyses shows that the newly interpreted mid-ocean ridges stretch for ~71000km (average segment length of ~48km), with the associated transform faults showing a cumulative length of ~24500 km. Non-transform and overlapping ridge segments play also a major but unquantified role in the dynamics of oceanic plate boundaries, representing ~8000km of ridge offset, and ~4000 and 1500km of ridge overlap and underlap respectively.

Fichier non déposé

Dates et versions

hal-04886854 , version 1 (14-01-2025)

Identifiants

  • HAL Id : hal-04886854 , version 1

Citer

Benjamin Sautter, Javier Escartin, Carmen Gaina, Sven Petersen, Roi Granot, et al.. T21E-3388 MAPRIDGES: Global Database of Mid-Oceanic Ridge Segments and Transform Faults. AGU Fall Meeting 2024, Dec 2024, Washington DC, United States. ⟨hal-04886854⟩
173 Consultations
0 Téléchargements

Partager

  • More