Variations in 143Nd/144Nd and 87Sr/86Sr ratios in oceanic basalts

Author(s): O'Nions, R. K.; Hamilton, P. J.; Evensen, N. M.
Author Affiliation(s): Primary:
Lamont-Doherty Geol. Obs., Palisades, N.Y., United States
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 34(1), p.13-22. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 32 refs.Lamont-Doherty Geol. Obs.; Contrib. No. 2426; illus. incl. tables
Summary: 143Nd/144Nd ratios have been determined on 37 samples of oceanic basalt, with a typical precision of +2-3×10-5 (2 s). Ocean island and dredged and cored submarine basalts are included for which reliable measurements of 87Sr/86Sr ratios exist in the literature or have been measured as part of this study. A strong negative correlation exists between 143Nd/144Nd and 87Sr/86Sr ratios in basalts from Iceland and the Reykjanes Ridge, but such a clear correlation does not exist for samples from the Hawaiian Islands. However, when other ocean island basalts from the Atlantic are included there is an overall correlation between these two parameters. Increases and decreases in Rb/Sr in oceanic basalt source regions have in general been accompanied by decreases and increases respectively in Sm/Nd ratios. The compatibility of the data with single-stage models is assessed and it is concluded that enrichment and depletion events, which are consistent with transfer of silicate melts, are responsible for the observed variation.
Year of Publication: 1977
Research Program: DSDP Deep Sea Drilling Project
Key Words: 02 Geochemistry; Alkaline earth metals; Analysis; Ascension Island; Atlantic Ocean; Atlantic Ocean Islands; Basalts; Data; Deep Sea Drilling Project; East Pacific Ocean Islands; Europe; Geochemistry; Hawaii; Iceland; Igneous rocks; Islands; Isotopes; Leg 37; Metals; Mid-Atlantic Ridge; Nd-144/Nd-143; Neodymium; North Atlantic; Oceania; Oceanic; Pacific Ocean; Polynesia; Rare earths; Ratios; Regional; Reykjanes Ridge; Samples; South Atlantic; Sr-87/Sr-86; Stable isotopes; Strontium; Submarine; Tristan da Cunha; United States; Variations; Volcanic rocks; Western Europe
Coordinates: N190000 N223000 W1543000 W1603000
Record ID: 1977034298
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, United States