Hydrothermal exploration of the Fonualei Rift and Spreading Center and the Northeast Lau Spreading Center
German, Christopher R.
Resing, Joseph A.
Prien, R. D.
Walker, Sharon L.
Edmonds, Henrietta N.
Langmuir, Charles H.
MetadataShow full item record
We report evidence for active hydrothermal venting along two back-arc spreading centers of the NE Lau Basin: the Fonualei Rift and Spreading Center (FRSC) and the Northeast Lau Spreading Center (NELSC). The ridge segments investigated here are of particular interest as the potential source of a mid-water hydrothermal plume (1500–2000 m depth) which extends more than 2000 km across the SW Pacific Ocean dispersing away from an apparent origin close to the most northeastern limits of the Lau Basin. Our results indicate the presence of at least four new hydrothermal plume sources, three along the FRSC and one on the NELSC, the latter situated within 150 km of the maximum for the previously identified SW Pacific regional-scale plume. However, TDFe and TDMn concentrations in the southernmost FRSC plume that we have identified only reach values of 19 and 13 nmol/L and dissolved 3He anomalies in the same plume are also small, both in relation to the SW Pacific plume and to local background, which shows evidence for extensive 3He enrichment throughout the entire Lau Basin water column. Our results reveal no evidence for a single major point hydrothermal source anywhere in the NE Lau Basin. Instead, we conclude that the regional-scale SW Pacific hydrothermal plume most probably results from the cumulative hydrothermal output of the entire topographically restricted Lau Basin, discharging via its NE-most corner.
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 7 (2006): Q11022, doi:10.1029/2006GC001324.
Showing items related by title, author, creator and subject.
Hydrothermal exploration of mid-ocean ridges : where might the largest sulfide deposits be forming? German, Christopher R.; Petersen, Sven; Hannington, Mark D. (2015-11)Here, we review the relationship between the distribution of modern-day seafloor hydrothermal activity along the global mid-ocean ridge crest and the nature of the mineral deposits being formed at those sites. Since the ...
In-situ chemical sensors for detecting and exploring ocean floor hydrothermal vents : report of a workshop : technical report Hennet, Remy J-C.; Whelan, Jean K. (Woods Hole Oceanographic Institution, 1988-11)Researchers and engineers, from academia, government, and industry, met and discussed the feasibility of using state-of-the-art laboratory technology for in-situ chemical measurements in the deep ocean, in and around ...
Mineral phase analysis of deep-sea hydrothermal particulates by a Raman spectroscopy expert algorithm : toward autonomous in situ experimentation and exploration Breier, John A.; German, Christopher R.; White, Sheri N. (American Geophysical Union, 2009-05-14)This paper demonstrates that a Raman spectroscopy, point-counting technique can be used for phase analysis of minerals commonly found in deep-sea hydrothermal plumes, even for minerals with similar chemical compositions. ...