Mathematics – Logic
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..81..151w&link_type=abstract
Earth and Planetary Science Letters, Volume 81, Issue 2-3, p. 151-162.
Mathematics
Logic
39
Scientific paper
We report Sr, Nd and Pb isotope ratios and parent and daughter element concentrations in 34 volcanic rocks from Samoa. The highly undersaturated post-erosional volcanics, which have erupted in Recent to Historic time along a 250-km-long fissure, have isotopic compositions that define fields distinct from those of the tholeiitic to alkalic lavas of the older Samoan shield volcanoes. Most shield lavas have 206Pb/204Pb of 18.9-19.4, 87Sr/86Sr of 0.7045-0.7055 and 87Sr/86Sr (to 0.7075). In general, isotopic compositions of the shield lavas are similar to those of the Marquesas and Society Islands. Post-erosional samples have lower 206Pb/204Pb and 143Nd/144Nd and higher 87Sr/86Sr than most shield lavas. The most striking feature of the post-erosional data is a negative correlation between 207Pb/204Pb and 206Pb/204Pb. This suggests that post-erosional lavas are derived from mixtures of the shield source and a high-207Pb/204Pb, 87Sr/86Sr, low-206Pb/204Pb and 143Nd/144Nd post-erosional source which may contain recycled ancient sediment. This enriched mantle domain may also underlie the Ontong-Java and Manihiki Plateaus to the north and west. Although both the Samoan shield and post-erosional lavas show chemical characteristics often associated with mantle plumes, only the shield volcanism can plausibly be related to a plume. The post-erosional eruptions appear to be the result of flexure and rifting due to plate bending at the northern termination of the Tonga Trench.
Current address: Department of Geological Sciences, Cornell University, Ithaca, NY 14853, U.S.A.
White William M.
Wright Elizabeth
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