Kelley et al. (2013), Composition of plume-influenced mid-ocean ridge lavas and glasses from the Mid-Atlantic Ridge, East Pacific Rise, Galapagos Spreading Center, and Gulf of Aden

Plumes of mantle-derived material impinge on or otherwise interact with oceanic spreading centers in many locations throughout the world. These interactions often result in unique geochemical signatures in ridge lavas due to variations in mantle source composition. Kelley et al. (2013) presents high resolution and high precision trace element data for 573 samples of variably plume-influenced mid-ocean ridge basalts from the Mid-Atlantic Ridge, East Pacific Rise, Galapagos Spreading Center, and the Gulf of Aden (see figure). Although these samples have been studied and presented on in nearly 100 other publications, Kelley’s is one of the first comprehensive assessments of trace element variations including especially the unconventional trace elements Mo, Cd, Sn, Sb, W, and Tl in mid-ocean ridge basalts as a function of proximity to hot spots.

 

Kelley et al. identified several useful trace element ratios for determining source material for mid-ocean ridge basalts near mantle plumes. This paper found a linear correlation between Rb/Tl and La/Sm and concluded that Rb/Tl may be a good indicator of plume-related enriched mantle localities. Furthermore, elevated W/U near mantle plumes may indicate source material from the lower mantle near the Earth’s core. Enrichments in Mo/Ce and Sb/Ce may also provide evidence for deeply-rooted, upwelling mantle plumes.

 

The samples reported and discussed in the paper along with many other previously studied samples from the same locations (n>1300) are archived at the Marine Geological Samples Laboratory (MGSL) at the Graduate School of Oceanography, University of Rhode Island (GSO/URI). IGSNs (International GeoSample Numbers) for each sample have been obtained through SESAR (System for Earth Sample Registration) and are reported in the supplementary materials. In addition, PetDB ID’s are reported for all samples for which data currently exist in PetDB. By using SESAR and PetDB, Kelley invites further investigation of the physical samples, as well as the data that has already been collected about them.

 

Katherine A. Kelley, Richard Kingsley and Jean-Guy Schilling (2013), Composition of plume-influenced mid-ocean ridge lavas and glasses from the Mid-Atlantic Ridge, East Pacific Rise, Galapagos Spreading Center, and Gulf of Aden, Geochemistry, Geophysics, Geosystems, 14, 1, 223-242. DOI: 10.1002/ggge.20049

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