Lead and Helium Isotope Evidence from Oceanic Basalts for a Common Deep Source of Mantle Plumes

Details Lead and Helium Isotope Evidence from Oceanic Basalts for a Common Deep Source of Mantle Plumes Lead and Helium Isotope Evidence from Oceanic Basalts for a Common Deep Source of Mantle Plumes

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...272..991h&link_type=abstract

Science, Volume 272, Issue 5264, pp. 991-995

Computer Science

89

Scientific paper

Linear arrays in lead isotope space for mid-ocean ridge basalts (MORBs) converge on a single end-member component that has intermediate lead, strontium, and neodymium isotope ratios compared with the total database for oceanic island basalts (OIBs) and MORBs. The MORB data are consistent with the presence of a common mantle source region for OIBs that is sampled by mantle plumes. ^3He/^4He ratios for MORBs show both positive and negative correlation with the 206Pb/204Pb ratios, depending on the MORB suite. These data suggest that the common mantle source is located in the transition zone region. This region contains recycled, oceanic crustal protoliths that incorporated some continental lead before their subduction during the past 300 to 2000 million years.

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