BASALTS FROM MURUROA, FANGATAUFA AND GAMBIER ISLANDS (FRENCH-POLYNESIA) - GEOCHEMICAL DEPENDENCE ON THE AGE OF THE LITHOSPHERE

Authors
DUPUY C VIDAL P MAURY RC GUILLE G
Citation
C. Dupuy et al., BASALTS FROM MURUROA, FANGATAUFA AND GAMBIER ISLANDS (FRENCH-POLYNESIA) - GEOCHEMICAL DEPENDENCE ON THE AGE OF THE LITHOSPHERE, Earth and planetary science letters, 117(1-2), 1993, pp. 89-100
Citations number
42
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Earth and planetary science letters → ACNP
ISSN journal
0012821X
Volume
117
Issue
1-2
Year of publication
1993
Pages
89 - 100
Database
ISI
SICI code
0012-821X(1993)117:1-2<89:BFMFAG>2.0.ZU;2-W
Abstract
Basaltic volcanics from Mururoa, Fangataufa and Gambier islands, which belong to the Pitcairn island chain, have been studied for trace elem ents and Sr, Nd and Pb isotopic composition. While the trace element r atios remain constant, the Sr-87/Sr-86 ratios range from 0.70292 to 0. 70367, Nd-143/Nd-144 ranges from 0.51303 to 0.51288 and the Pb-206/Pb- 204 isotopic composition ranges from 18.99 to 19.62. These values, whi ch are clearly distinct from those of Pitcairn basalts, vary according to distance from the present hot spot and are correlated with the age of the underlying lithosphere. It is suggested that the basalts studi ed were produced by variable degrees of partial melting from an oceani c lithospheric plate metasomatized by prior passage over the Easter ho t spot.