The effect of primary versus secondary processes on the volatile content of MORB glasses: An example from the equatorial Mid‐Atlantic Ridge (5°N–3°S)

Le Voyer, Marion; Cottrell, Elizabeth; Kelley, Katherine A.; Brounce, Maryjo; Hauri, Erik H.

doi:10.1002/2014JB011160

Title: The effect of primary versus secondary processes on the volatile content of MORB glasses: An example from the equatorial Mid‐Atlantic Ridge (5°N–3°S)

Journal Article · Wed Jan 14 00:00:00 EST 2015 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2014JB011160· OSTI ID:1240462

Le Voyer, Marion ^[1]; Cottrell, Elizabeth ^[2]; Kelley, Katherine A. ^[3]; Brounce, Maryjo ^[3]; Hauri, Erik H. ^[4]

Department of Terrestrial MagnetismCarnegie Institution of Washington Washington District of Colombia USA, National Museum of Natural HistorySmithsonian Institution Washington District of Columbia USA
National Museum of Natural HistorySmithsonian Institution Washington District of Columbia USA
Graduate School of OceanographyUniversity of Rhode Island, Narragansett Bay Campus Narragansett Rhode Island USA
Department of Terrestrial MagnetismCarnegie Institution of Washington Washington District of Colombia USA

We report microanalysis of volatile and trace element compositions, as well as Fe³⁺/ΣFe ratios, from 45 basaltic glasses from cruise RC2806 along the equatorial Mid–Atlantic Ridge. The along–strike variations in volatiles result from the complex geodynamical setting of the area, including numerous transform faults, variations in ridge depth, melting degree, and source composition. The strongest gradient is centered on 1.7°N and encompasses an increase of H₂O, Cl, and F contents as well as high F/Zr ratio spatially coincident with radiogenic isotope anomalies. We interpret these variations as source enrichment due to the influence of the nearby high–μ–type Sierra Leone plume. South of the St. Paul fracture zone, H₂O and F contents, as well as H₂O/Ce and F/Zr ratios, decrease progressively. This gradient in volatiles is consistent with progressive dilution of an enriched component in a heterogeneous mantle due to the progressive increase in the degree of melting. These two large–scale gradients are interrupted by small–scale anomalies in volatile contents attributed to (1) low–degree melts preferentially sampling enriched heterogeneities near transform faults and (2) local assimilation of hydrothermal fluids in four samples from dredge 16D. Finally, 20 RC2806 samples described as “popping rocks” during collection do not show any difference in volatile content dissolved in the glass or in vesicularity when compared to the RC2806 “nonpopping” samples. Our observations lead us to question the interpretation of the CO₂ content in the highly vesicular 2πD43 “popping rock” as being representative of the CO₂ content of undegassed mid–ocean ridge basalt.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02‐98CH10886; FG02‐92ER14244

OSTI ID:: 1240462

Alternate ID(s):: OSTI ID: 1229450; OSTI ID: 1240464

Report Number(s):: BNL-111526-2015-JA

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Vol. 120 Journal Issue: 1; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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Title: The effect of primary versus secondary processes on the volatile content of MORB glasses: An example from the equatorial Mid‐Atlantic Ridge (5°N–3°S)

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