Fluid Fluxes and Manganese Nodules


Hydrothermal fluids can withdraw significant amounts of heat from the oceanic lithosphere by lateral fluid flow through permeable basaltic crust of an age of up to 65 Ma. Basement out- crops in-between impermeable pelagic sediments permit fluid recharge and discharge. A recharge site has been detected on the flank of one of the numerous seamounts in the work- ing area in the equatorial E-Pacific. Moreover, successions of small basins typical for "hydro- thermal pits" occur which could be interpreted as fossil discharge sites. The objective of this project will be to investigate the regional pattern of fluid circulation based on heat flow meas- urements and pore-water geochemistry. Recharge of oxic seawater causes upward oxygen diffusion into the sediments overlying the permeable basalt in areas proximal to the recharge sites. The prolonged oxygen exposure time is suggested to have a strong impact on biogeo- chemical processes in the sediments and the element inventory of Mn nodules. The quantita- tive investigation of such processes and element enrichments and their range of influence around recharge sites is thus the second objective of this project. An additional goal will be to investigate whether fluid circulation through 21 Million years old crust can mobilize metals and affect metal flux rates into sediments and nodules at possible discharge sites.

DOI https://doi.org/10.1594/PANGAEA.885087
Related Identifier https://doi.org/10.1130/G39091.1
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.885087
Creator Versteegh, Gerard J M; Kasten, Sabine; Koschinski, Andrea; Preuss, Inken; Kuhn, Thomas
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2018
Rights Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Language English
Resource Type Collection of Datasets
Format application/zip
Size 1 datasets
Discipline Earth System Research
Spatial Coverage (-118.168 LON, 13.175 LAT); North Pacific Ocean