Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise.

Autor:	Marjanović M; Institut de Physique du Globe de Paris, Université Paris Cité, CNRS UMR7154, Paris, France., Carbotte SM; Department of Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA., Stopin A; Shell Global Solutions International B.V., Amsterdam, Netherlands., Singh SC; Institut de Physique du Globe de Paris, Université Paris Cité, CNRS UMR7154, Paris, France., Plessix RÉ; Shell Global Solutions International B.V., Amsterdam, Netherlands., Marjanović M; Faculty of Mining and Geology, University of Belgrade, Belgrade, Serbia., Nedimović MR; Department of Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA.; Department of Earth and Environmental Sciences, Dalhousie University, Halifax, Nova Scotia, Canada., Canales JP; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, USA., Carton HD; Institut de Physique du Globe de Paris, Université Paris Cité, CNRS UMR7154, Paris, France.; Department of Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA., Mutter JC; Department of Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA., Escartín J; Laboratoire de Géologie, École Normale Supérieure (CNRS UMR), PSL Research University, Paris, France.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2023 Sep 29; Vol. 9 (39), pp. eadi2698. Date of Electronic Publication: 2023 Sep 29.
DOI:	10.1126/sciadv.adi2698
Abstrakt:	Models of magmatic systems suggest that the architecture of crustal magma bodies plays an important role in where volcanic eruptions occur, but detailed field observations are needed to evaluate them. We present ultrahigh-resolution reflection images of magma bodies beneath a region of multiple eruptions along the East Pacific Rise derived from three-dimensional seismic surveying. The observations reveal magma bodies with elongate ridges and troughs vertically aligned with seafloor eruptive fissures that we interpret as remnant dike root zones where repeat dikes nucleate. We document a triangular feeder zone to the axially centered magma body from the off-axis source for a newly forming seamount of the Lamont chain and infer bottom-up eruption triggering due to recharge from this deeper source. The findings indicate that magma bodies are sculpted by both processes of magma recharge from below and magma extraction to the surface, leaving a morphological imprint that contributes to localization of dike nucleation and eruption sites at the East Pacific Rise.
Databáze:	MEDLINE
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