Detailed Analysis of Near Tectonic Features Along the East Pacific Rise at 16 degrees N, Near the Mathematician Hot Spot
| Autor: | Rémy Thibaud, M. Le Saout, Pascal Gente |
|---|---|
| Přispěvatelé: | Laboratoire Géosciences Océan (LGO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Dike
010504 meteorology & atmospheric sciences mid-ocean ridge Hot spot (veterinary medicine) 010502 geochemistry & geophysics 01 natural sciences Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Bathymetry brittle deformation Petrology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography 0105 earth and related environmental sciences dike intrusion [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics geography Plateau geography.geographical_feature_category Deformation (mechanics) Mid-ocean ridge East Pacific Rise Tectonics Geophysics 13. Climate action Space and Planetary Science Magma [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology faulting Geology |
| Zdroj: | Journal Of Geophysical Research-solid Earth (2169-9313) (Amer Geophysical Union), 2018-06, Vol. 123, N. 6, P. 4478-4499 Journal of Geophysical Research Journal of Geophysical Research, American Geophysical Union, 2018, 123 (6), pp.4478-4499. ⟨10.1029/2017JB015301⟩ |
| ISSN: | 0148-0227 2156-2202 |
| DOI: | 10.1029/2017JB015301⟩ |
| Popis: | International audience; Spreading processes at the axes of fast spreading ridges are mainly controlled by magmatic activity, whereas tectonic activity dominates further away from the axis. High-resolution near-bottom bathymetry data, photographs, videos, and human observations from submersible surveys are used to develop a detailed tectonic analysis of the 16°N segment of the East Pacific Rise (EPR). These data are used to evaluate how a highly magmatic segment, close to a hot spot, affects the nucleation and evolution of faulting patterns and impacts the evaluation of tectonic strain within 2 km of the spreading axis. Our study shows that (1) the growth of tectonic features differs in response to dike intrusion and tectonic extension, (2) the initiation of brittle extension is strongly controlled by the location of the axial magma lens and the development of layer 2A, and (3) the high magmatic budget and the off-axis magma lens in the west part of the plateau do not significantly impact the initiation of brittle extension along the central portion of the 16°N segment. Within the axial summit region, more than 2% of plate separation at 16°N on the EPR is accommodated by brittle extension, as is observed at other EPR segments. The interaction of the Mathematician hot spot with this EPR segment has no significant influence on the initiation of the tectonic deformation, but it does reduce the development of the brittle deformation. |
| Databáze: | OpenAIRE |
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