Abstract
Hornblende spessartite dikes of the Sandia Mountains, New Mexico, contain small leucocratic dikelets that appear to be differentiated from the spessartite by fractional crystallization. Mineralogically the leucocratic dikelets are hornblende syenite, but chemically they more closely resemble Nockolds's (1954) average monzonite. During differentiation $$SiO_{2}, Al_{2}O_{3}, Na_{2}O, and K_{2}O$$ increased; $$TiO_{2}$$, FeO, MnO, MgO, $$H_{2}O$$, and $$P_{2}O_{5}$$ decreased markedly; and $$Fe_{2}O_{3}$$ and CaO decreased slightly. Textural relationships suggest unobstructed crystallization of hornblende and possibly some plagioclase in a $$H_{2}O$$-rich fluid of low viscosity with late crystallization of primary epidote and chlorite.
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