Genetic significance of Co, Cr, Ni, Sc and V content of andesites

Details Genetic significance of Co, Cr, Ni, Sc and V content of andesites Genetic significance of Co, Cr, Ni, Sc and V content of andesites

Feb 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33..275t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 33, Issue 2, pp.275-286

Physics

23

Scientific paper

The vanadium content of calc-alkaline andesites averages 175 ppm and is similar to that observed in basalts (average 200 ppm). The average nickel content of andesites is about 18 ppm, which is much lower than the nickel contents of alkali or tholeiitic basalts (average 120 ppm) but is similar to concentrations observed in high-A1 basalts (average 25 ppm). The Ni/Co ratios of calc-alkaline andesites and high-A1 basalts are less than one,in contrast to ratios of greater than two in alkali and tholeiitic basalts. The data are difficult to explain by previous hypotheses for the origin of andesite magma, that involve 1. (1) removal of magnetite 2. (2) mixing or assimilation of basic, or acid material, or deep-sea sediments, 3. (3) partial melting of quartz eclogite at high pressures and 4. (4) fractional crystallisation from a parent high-A1 basalt, under low pressures. A two-stage process of partial melting from pyrolite is consistent with the ferromagnesian trace element abundances.

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