INVESTIGADORES
CHIODI Agostina Laura
congresos y reuniones científicas
Título:
Microbial diversity in the backarc hot springs of Argentina and its role in biogeochemical cycles
Autor/es:
CASCONE M.; LLOYD K.; ROGERS T.; DE MOOR M.; SCHRENK M.; BARRY P.; JESSEN G.; AGOSTINA CHIODI; SCELCI M.; GIOVANELLI D.
Reunión:
Congreso; Goldschmidth; 2021
Resumen:
Subduction zones are critical in recycling of volatiles and elements between the surfaceand planetary interior and play a key role in climate stability and planetary habitability.Both in the forearc and backarc the lithosphere is affected by the deformation inducedby the plate movements, generally favouring faults formations and the widespreadorigination of deeply-sourced springs, hot or cold, that carry deep fluids and gases tothe surface. These fluids and gases originate from the subducting slab as well as fromthe interaction of the rising fluids and melts with the overlying crust, and generate "hotspots" of microbial diversity and activity driven by the sharp redox, geochemical andoften thermal gradients. Given their direct connection with the subsurface, deeplysourcedsprings can be used as a window into the deep to understand processeshappening at depth. To be able to use deeply-sourced springs as conduits to thesubsurface we need to be able to deconvolve the surface signals from the deepsubsurface ones. Despite the abundance of studies looking at the microbiology of hotsprings globally, there are relatively few studies linking microbial diversity to theunderlying geological processes, and especially in the backarc regions information isscarce. Here we present data on the microbial diversity of the deeply sourced springsalong the backarc of the volcanic complex of Puna, Argentina, and assess the extent ofinfluence from surface processes of the spring communities. We conclude thatsurrounding soil and shallow subsurface communities contribute minimally to thediversity of the deeply sourced fluids that thus represent key samples to investigate thedeep continental subsurface.