Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..42..359t&link_type=abstract
Earth and Planetary Science Letters, Volume 42, Issue 3, p. 359-367.
Other
7
Scientific paper
New rare earth element (REE) data, Rb and Sr analyses and Sr isotope measurements are presented for pumice clasts collected from some North Chilean ignimbrites of dacite and rhyolite composition. The samples are light-REE enriched with chondrite-normalised Ce (CeN) of 17-98, YbN of 4-14 and CeN/YbN of 2.6-15. While some samples have no Eu anomalies, others do have anomalies with inferred Eu/Eu* values of down to ca. 0.4. Eleven samples have present-day 87Sr/86Sr ratios between 0.7053 and 0.7100, and noting that some samples are up to 12 Ma old, initial 87Sr/86Sr ratios are below ca. 0.709. These trace element and Sr isotope characteristics resemble those of contemporaneous andesite and dacite lavas, suggesting a common origin for all these rock types. The higher Rb/Sr ratios and larger Eu anomalies in most of the dacitic and rhyolitic ignimbrites are consistent with an origin by plagioclase-dominated fractional crystallization of mantle-derived andesite magma.
Francis Peter W.
Moorbath Stephen
Thorpe R. S.
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