Galerne, Christophe Y. , Lizarralde, Daniel, Berndt, Christian , Neumann, Florian, Höfig, Tobias, Stock, Joann M., Pena-Salinas, Manet E., Negrete-Aranda, Raquel and Teske, Andreas P. and The Expedition 385 Scientists (2021) Magma plumbing system and associated hydrothermal vents in the Guaymas Basin - geometry and implications. [Talk] In: EGU General Assembly 2021. , 19.-30.03.2021, Online . DOI 10.5194/egusphere-egu21-13015.

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Abstract

We document the geometry of a massive sill at the root of an approximately 20-m high and 800m-wide ring of hydrothermal formations, termed Ringvent, located 28.5 km off-axis on the
northwestern flanking regions of the actively rifting Guaymas Basin (Gulf of California). Using petrophysical data collected during the IODP Expedition 385 and processed 2D seismic profiles, we present evidence on the mechanics of sill emplacement and how the related hydrothermal vent conduits were constructed. The currently active moderate-temperature hydrothermal vent field indicates that, despite being cold and crystallized, the magma plumbing system, is tapping into a deeper geothermal source of the basin. The vent system roots at the vertical end of the magma plumbing system with the top of the sill located at a depth range of 80 to 150 m below the seafloor. Our research aims at constraining how far deep the geothermal fluids are coming from, and identifying how close the hydrothermal system is from a steady-state condition, to draw implications for how frequently such a system may arise in nascent ocean basins.

Document Type:	Conference or Workshop Item (Talk)
Keywords:	Magma, plumbing system, hydrothermal vents, Guaymas Basin
Research affiliation:	OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
International?:	Yes
Date Deposited:	28 Jun 2022 09:30
Last Modified:	28 Jun 2022 09:30
URI:	https://oceanrep.geomar.de/id/eprint/56442

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