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SUMMARY:Unravelling magma-water interaction in an oceanic core complex wit
 h full-waveform imaging and numerical modelling - Michele Paulatto\, Imper
 ial College London
DTSTART:20250312T140000Z
DTEND:20250312T150000Z
UID:TALK226657@talks.cam.ac.uk
CONTACT:Tom Merry
DESCRIPTION:3D full waveform inversion (FWI) has been applied to the seism
 ic refraction data of the MARINER (Mid-Atlantic Ridge INtegrated Experimen
 t at Rainbow) experiment to create a robust high-resolution model of the s
 eismic velocity structure of the Rainbow massif. The Rainbow massif is an 
 oceanic core complex located on a non-transform discontinuity (NTD) in a m
 agma-starved region of the mid-Atlantic Ridge at 36ºN. Despite the low ma
 gmatic input\, the core complex hosts a high-temperature hydrothermal vent
  field  (>340°C) that requires a long-lived magmatic heat source. The F
 WI results show that deep within the massif\, ∼3-8 km below the seafloor
 \, lies a low-velocity body that represents a partially molten sill comple
 x. The sill complex extends north to the AMAR Minor N segment suggesting a
 n increased magmatic input into this segment\, forcing the NTD to migrate 
 southwards. Extensive magmatic intrusion into the core complex was likely 
 responsible for termination of slip on the detachment fault. We model hydr
 othermal fluid flow inside the Rainbow massif using the Imperial College F
 inite Element Reservoir Simulator (IC-FERST). The model geometry\, thermal
  properties\, flow properties and boundary conditions are informed by the 
 seismic constraints. We show that the high temperatures within the core of
  the Rainbow massif prevent serpentinization from taking place and govern 
 the location of the serpentinization front.
LOCATION:Wolfson Lecture Theatre
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