Apply to Sail: Expedition 385 Guaymas Basin Tectonics and Biosphere
The International Ocean Discovery Program (IODP) is now accepting applications for scientific participants on Expedition 385 Guaymas Basin Tectonics and Biosphere, aboard the JOIDES Resolution.
IODP Expedition 385 (based on Proposals 833-Full2 and 833-Add) will core and log a series of sites in the Guaymas Basin to investigate the relationship of tectonics, magmatism, sedimentation, carbon cycling, and microbial activity. The Guaymas Basin in the Gulf of California is a young, marginal rift basin characterized by active seafloor spreading and rapid deposition of organic-rich sediments from highly productive overlying waters. The active formation of oceanic crust combined with a thick sedimentary overburden has given rise to a dynamic environment, where strongly connected physical, chemical, and biological processes govern the cycling of sedimentary carbon. Its fate upon deposition depends on the relative efficiencies of interrelating microbial and chemical processes, leading either to sequestration or release of carbon. Expedition 385 aims to illuminate the interaction between these processes and its ultimate consequences for carbon cycling, which will help understand similar settings in marginal seas throughout the world.
Drilling toward and through seismically imaged sills of varying age and temperature into the intercalated sill-sediment package will provide core and log data to constrain the links between sediment accumulation, sill emplacement, sediment alteration, fluid expulsion, as well as microbial utilization and sequestration of carbon along subseafloor fluid pathways. The primary objectives are to: (1) Explore the physical and chemical gradients along active and extinct fluid pathways associated with sill emplacement; (2) Investigate subsurface microbial communities that are sustained by alteration products, in order to determine how efficiently they capture carbon-bearing alteration products; and (3) Advance our understanding of the conditions that limit life in the deep biosphere.
Coring sill-sediment successions will provide an integrated record of igneous accretion as well as baseline data of carbon flux, including unaltered subsurface sediments and those that have experienced multiple generations of sill intrusion at depth. Petrophysical data (e.g., porosity/permeability) will also constrain crustal fluid flow and heat exchange that exert fundamental controls on this system. All findings will deepen our understanding of mechanisms of carbon remobilization implicated in global-scale rapid climate change.
The expedition will take place from 19 September to 19 November 2019 .
Opportunities exist for researchers (including graduate students) in all shipboard specialties, including but not limited to sedimentology, micropaleontology, paleomagnetism, inorganic/organic geochemistry, microbiology, petrology, petrophysics, and borehole geophysics.
U.S.-affiliated scientists interested in participating in this expedition should apply to sail through the U.S. Science Support Program. The deadline to apply is April 15, 2018.
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