Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Articles | Volume 501
Articles | Volume 501
https://doi.org/10.5194/piodp-501-1-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/piodp-501-1-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 501
Scientific prospectus
 | 
03 Nov 2025
Scientific prospectus |  | 03 Nov 2025

IODP3–NSF Expedition 501 “New England Shelf Hydrogeology” Scientific Prospectus

Brandon Dugan, Karen Johannesson, and Jeremy Everest

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Short summary
Freshened water exists in continental shelf aquifers worldwide. One remarkable example is the US Atlantic shelf, where groundwater in shallow sand aquifers >100 km offshore has salinity that is 10 % of seawater salinity. Expedition 501 will drill sites off Massachusetts, US, to estimate how much freshened water there is, processes that emplace the water, and rates of emplacement. The expedition will also assess whether salinity patterns have important implications for microbial processes.
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