Crustal thickness of V-shaped ridges south of the Azores: Interaction of the Mid-Atlantic Ridge (36°-39°N) and the Azores hot spot
| Autor: | Javier Escartín, Jian Lin, Mathilde Cannat, Aline Rabain, Gaud Pouliquen |
|---|---|
| Přispěvatelé: | Institut de Physique du Globe de Paris (IPGP), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Université Paris Diderot - Paris 7 (UPD7)-IPG PARIS-Institut national des sciences de l'Univers (INSU - CNRS), Woods Hole Oceanographic Institution (WHOI), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2001 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Seamount Soil Science Mid-Atlantic Ridge Aquatic Science 010502 geochemistry & geophysics Oceanography 01 natural sciences Mantle (geology) Gravity anomaly Geochemistry and Petrology Lithosphere Earth and Planetary Sciences (miscellaneous) 14. Life underwater Petrology rock mechanics 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics geography geography.geographical_feature_category Ecology Paleontology Forestry Crust ocean-floor spreading Seafloor spreading Geophysics 13. Climate action Space and Planetary Science Ridge serpentine rheology lithosphere faulting Seismology Geology |
| Zdroj: | Journal of Geophysical Research : Solid Earth Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2001, 106 (B10), pp.21719-21735. ⟨10.1029/2001jb000224⟩ Scopus-Elsevier |
| ISSN: | 0148-0227 2169-9313 2169-9356 |
| DOI: | 10.1029/2001jb000224 |
| Popis: | V-shaped ridges propagating along the Mid-Atlantic Ridge axis south of the Azores and Iceland hot spots indicate that ridge-hot spot interactions produce temporal and spatial variations in melt supply to the ridge axis. Estimates of relative crustal thickness variations associated with the ridges south of the Azores hot spots, based on gravity and bathymetry data collected during the SudAcores cruise (1998), provide constraints on the rate of propagation of these melt anomalies and on the variations in melt production along the axis and in time. The maximum apparent crustal thickness along the Azores V ridge is ∼14 km near the Azores, decreasing to normal crustal thickness of ∼6 km toward the south. This crustal thickness variation may be explained by enhanced melt production associated with the propagation of a mantle temperature anomaly that initiated ∼10 Myr ago at the Azores hot spot. The temperature anomaly decreased as it propagated southward, reaching ambient mantle temperatures at the present time at its predicted location under the axis. The excess melt was emplaced on axis forming discrete, shallow ( |
| Databáze: | OpenAIRE |
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