Seismic Signatures of Hydrothermal Pathways Along the East Pacific Rise Between 9°16′ and 9°56′N - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Geophysical Research : Solid Earth Year : 2017

Seismic Signatures of Hydrothermal Pathways Along the East Pacific Rise Between 9°16′ and 9°56′N

Abstract

We apply wave equation-based techniques to 2-D seismic data to characterize the nature of zero-age upper crust at the East Pacific Rise from 9°16 0 to 9°56 0 N. The final velocity model reveals a number of low-velocity anomalies, complex in shape, extending down to ~1 km below the seafloor. We attribute them to the presence of hydrothermal flow. Depending on their spatial correlation with the previously identified tectonic discontinuities in bathymetry and presence of venting, we classify them as downgoing and upgoing pathways, respectively. This distinction is not always clear; within the third-order discontinuities at 9°20 0 and 9°37 0 N, both pathways may be present. The region north of 9°44 0 N, known for its magmatic robustness and volcanic activity, is represented by five low-velocity perturbations. Three of these anomalies are spatially correlated with the fourth-order discontinuities and attributed to the presence of the on-axis recharge zones. The remaining two anomalies underlie two vent clusters, marked as hydrothermally active sites after the last documented eruption event. These velocity anomalies can be thus identified as the up-flow pathways or at least their remnants. By comparing our results to the available interdisciplinary data sets, we show that the interaction between the tectono-magmatic and hydrothermal processes is not straightforward due to different timescales at which they operate. However, for developing, maintaining, and driving vigorous, high-temperature hydrothermal flow, the high crustal permeability and high thermal regime must coexist in time and space.
Fichier principal
Vignette du fichier
Marjanovi-_et_al-2017-Journal_of_Geophysical_Research%3A_Solid_Earth.pdf (3.78 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

insu-01875624 , version 1 (17-09-2018)

Identifiers

Cite

Milena Marjanović, Nobuaki Fuji, Satish C Singh, Thomas Belahi, Javier Escartin. Seismic Signatures of Hydrothermal Pathways Along the East Pacific Rise Between 9°16′ and 9°56′N. Journal of Geophysical Research : Solid Earth, 2017, 122 (12), pp.10,241-10,262. ⟨10.1002/2017jb015004⟩. ⟨insu-01875624⟩
112 View
151 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More