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Journal of Petrology Advance Access published online on November 24, 2004
Journal of Petrology, doi:10.1093/petrology/egh085
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Received March 2, 2004
Accepted September 28, 2004

Article

Systematic Variation of Sr-, Nd- and Pb-Isotopes with Time in Lavas of Mauritius, Réunion Hotspot

SUSUMU NOHDA 1*, ICHIRO KANEOKA 2, TAKESHI HANYU 2, SHENG XU 3, and KOZO UTO 3

1 DEPARTMENT OF ENVIRONMENTAL SCIENCES, KUMAMOTO UNIVERSITY, KUMAMOTO 860-8555, JAPAN
2 EARTHQUAKE RESEARCH INSTITUTE, UNIVERSITY OF TOKYO, BUNKYO-KU, TOKYO 113-0032, JAPAN
3 INSTITUTE OF GEOSCIENCE, AIST, TSUKUBA 305-8567, JAPAN

* To whom correspondence should be addressed.
SUSUMU NOHDA, E-mail: snohda{at}sci.kumamoto-u.ac.jp


  Abstract

We report Sr-, Nd- and Pb-isotopic compositions for the lavas of Mauritius, the second youngest volcanic island in the Réunion hotspot. The lavas of the Older Series (7·8-5·5 Ma) have identical isotopic compositions (87Sr/86Sr = 0·70411 to 0·70422, 143Nd/144Nd = 0·512865 to 0·512854, and 206Pb/204Pb = 19·016 to 19·041) to those of Réunion, where the center of volcanic activity is currently located. The lavas of the Intermediate Series (3·5-1·9 Ma) and Younger Series (0·70-0·17 Ma) are shifted to lower Sr-isotopic compositions (0·70364-0·70394, with 143Nd/144Nd = 0·512813 to 0·512948 and 206Pb/204Pb = 18·794 to 18·984). The Intermediate Series lavas have similar trace-element characteristics (e.g. Zr-Nb, Ba-Y) to those of Rodrigues, in both cases requiring the involvement of an enriched mantle-like component in the mantle source. During the volcanic history of Mauritius, the magmas lost the principal isotopic characteristics of the Réunion hotspot with time, and became gradually imprinted with the isotopic signature of a shallower mantle source that produced the Central Indian Ridge basalts.

Keywords: hotspot; isotopes; Mauritius; Réunion; trace element.
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