Whole-rock/groundmass differentiation trends of rare earth elements in high-silica rhyolites

Details Whole-rock/groundmass differentiation trends of rare earth elements in high-silica rhyolites Whole-rock/groundmass differentiation trends of rare earth elements in high-silica rhyolites

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..759c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 5, pp.759-769

Computer Science

5

Scientific paper

Whole-rock/groundmass differentiation trends of three series of high-silica rhyolites from northern Mexico and west Texas contrast with that of the Bishop Tuff of California. Together, the four rock series cover a complete spectrum of trends from one where all REE increase with differentiation (peralkaline series of the Chinati Mountains, Texas) to one where all except Ce decrease with fractionation (Batopilas, Mexico). The various differentiation trends reflect different accessory mineral assemblages and different apparent partition coefficient patterns of major mafic phenocrysts. The light REE decrease during differentiation in rock series where mafic phenocrysts and accessory phases are relatively enriched in the light REE ( e.g. , metaluminous series of the Chinati Mountains and the Bishop Tuff). In series that lack light REE-enriched accessory minerals and contain minerals with maxima in their partition coefficient patterns in the middle and heavy REE ( e.g. , zircon, apatite, and hornblende), the middle and heavy REE in the rock series decrease with fractionation ( e.g. , Batopilas). Finally, in rock series that lack abundant REE-enriched accessory minerals and that have relatively small partition coefficients for the major mafic minerals, the REE increase with differentiation ( e.g. , peralkaline series of the Chinati Mountains).

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