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SUMMARY:Volatile recycling at the Lesser Antilles subduction zone: Hydrati
 on of the incoming Atlantic oceanic crust
DTSTART;TZID=Europe/London:20260515T120000
DTEND;TZID=Europe/London:20260515T130000
DTSTAMP:20260515T142012Z
UID:ac1b9698-1734-f111-88b4-7ced8d99a758
CREATED:20260409T132547Z
DESCRIPTION:Abstract: The subduction water cycle is a key process for unde
 rstanding the long-term evolution of surface water\, arc volcanism\, conti
 nental growth\, mantle hydration and convection.  Much of our current unde
 rstanding of volatile recycling comes from studies in the Pacific and Indi
 an Oceans where fast-spread oceanic lithosphere is subducted. In this talk
  I will present results from project VoiLA– a NERC-funded large grant th
 at targeted the Lesser Antilles subduction system in the slow-spread Atlan
 tic. One of the project challenges was to estimate the incoming hydration 
 and predict its spatial variability. To do this we collected a 380-km long
 \, ridge-parallel active-source profile with closely-spaced ocean-bottom s
 eismometers to give a high-quality dataset. We recorded sufficient convert
 ed S-waves to distinguish between hydrated serpentine and unhydrated lower
  crustal igneous rocks\, allowing us to estimate the chemically bound wate
 r content for the first time. The pattern of hydration is highly variable 
 and poorly correlated with fracture zones\, as predicted by studies in the
  Pacific. On average the bound water content of the Atlantic crust is four
  times that of the Pacific crust. Implications for the Lesser Antilles arc
  will be discussed.\n\nFurther information can be found here:\nLi\, L.\, C
 ollier\, J.S. et al.\, (2025) “Estimating excess bound water content due
  to serpentinisation in mature slow-spread oceanic crust using P- and S-wa
 ves” Nat Comms. DOI: 10.1038/s41467-025-62052-x\n\n \n\nLi\, L.\, Collie
 r\, J.S.\, et al.\, (2024) “Downward continued ocean bottom seismometer 
 data show\n\ncontinued hydrothermal evolution of mature oceanic upper crus
 t” Geology. DOI: 10.1130/g52329.1
LAST-MODIFIED:20260409T133542Z
LOCATION:Department of Earth Sciences - Seminar rooms\, Seminar rooms Depa
 rtment of Earth Sciences South Parks Road Oxford Oxfordshire OX1 3AN Unite
 d Kingdom
SPEAKER:Prof Jenny Collier (Imperial College London)
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