A primitive plume neon component in MORB: The Shona ridge-anomaly, South Atlantic (51-52°S)

Details A primitive plume neon component in MORB: The Shona ridge-anomaly, South Atlantic (51-52°S) A primitive plume neon component in MORB: The Shona ridge-anomaly, South Atlantic (51-52°S)

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.133..367m&link_type=abstract

Earth and Planetary Science Letters, vol. 133, Issue 3-4, pp.367-377

Computer Science

40

Scientific paper

We report on He and Ne isotopes in basaltic glasses from eight dredge stations occupied over the Shona gravity and topographic anomaly high on the Mid-Atlantic Ridge around 51-52°S. The results indicate the presence of a primitive, little degassed, 3 He-rich mantle component. ratios correlate positively with the bathymetric and gravity anomaly, with values ranging from 12.5 to 6.4 times the atmospheric ratio of 1.38 × 10 -6 . The highest value is almost identical to that of the Bouvet and Réunion hotspots. Neon isotopic ratios in vs. isotope space indicate recent mixing between a primitive mantle plume component with near-solar Ne and the upper mantle MORB source; and again, the most solar-like Ne found over the Shona ridge-anomaly is similar to that found at the Réunion hotspot. For the first time, a negative trend pointing toward solar values is bridging the commonly observed MORB-air and the Hawaiian L-K-air mixing lines of positive slope. These results suggest that the source of the Shona ridge-anomaly has a similar origin to that of the 3 He-rich Bouvet and Réunion plume sources in the deep mantle, which could define a particular noble gas signature in the South Atlantic and the Indian Ocean. It is also evident that the source of the Shona plume is distinct from the 4 He-rich source of the Tristan and Gough family of plumes located further north.

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