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SUMMARY:Volatile recycling at the Lesser Antilles subduction zone - Jenny 
 Collier -- Imperial College London
DTSTART:20240117T160000Z
DTEND:20240117T170000Z
UID:TALK207826@talks.cam.ac.uk
CONTACT:Lisanne Jagt
DESCRIPTION:The subduction water cycle is a key process for understanding 
 the long-term evolution of surface water\, arc volcanism\, continental gro
 wth\, mantle hydration and convection. Much of our current understanding o
 f volatile recycling comes from studies in the Pacific and Indian Oceans w
 here fast-spread oceanic lithosphere is subducted. In this talk I will pre
 sent results from project VoiLA– a NERC-funded large grant that ran betw
 een 2015 and 2021 and targeted the Lesser Antilles subduction system in th
 e slow-spread Atlantic. The project combined active source seismology\, pa
 ssive seismology\, geochemistry and numerical modelling to investigate hyd
 ration of the incoming plate and dehydration below the arc and fore-arc. W
 ith an emphasis on active source seismology I will show that the incoming 
 plate in the Atlantic case is much wetter and more laterally variable than
  Pacific/Indian Ocean examples. The results\, when mapped onto the slab\, 
 show a clear correlation with the overlying mantle wedge properties obtain
 ed from passive-source seismology and arc geochemistry. Our work offers th
 e potential to improve global volatile budget estimates back through geolo
 gical time.\n\nThe talk will contain material from the following papers:\n
 \nBraszus\, B.\, et al.\, (2021). "Subduction history of the Caribbean fro
 m upper-mantle seismic imaging and plate reconstruction." Nature Commun\n\
 nAllen\, R. W. et al.\, (2022). "The Role of Crustal Accretion Variations 
 in Determining Slab Hydration at an Atlantic Subduction Zone." JGR\n\nCoop
 er\, G. F. et al.\, (2020). "Variable water input controls evolution of th
 e Lesser Antilles volcanic arc." Nature\n\nDavy\, R. G. et al.\, (2020). "
 Wide-Angle Seismic Imaging of Two Modes of Crustal Accretion in Mature Atl
 antic Ocean Crust." JGR\n\nHicks\, S. P. et al.\, (2023). "Slab to back-ar
 c to arc: Fluid and melt pathways through the mantle wedge beneath the Les
 ser Antilles." Science Advances
LOCATION:Wolfson Lecture Theatre
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