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Research on chemical evolution of magmas is closely related to that described in the previous section on "volatiles in magmas". This work has focussed on investigation of the trace element evolution processes that occur in magma chambers, such as fractional crystallization and magma mixing. Microbeam analyses of melt inclusions have provided a level of detailed observation of magmatic evolution that is typically not possible using whole rock analyses, although whole rock compositions of erupted magma also provide valuable insight.

REFERENCES:

 DUNBAR, N.W., KYLE, P.R., AND WILSON, C.J.N., 1989. Evidence for limited zonation in silicic magma systems, Taupo Volcanic Zone, New Zealand. Geology, 17, 234-236.ABSTRACT

 DUNBAR, N.W., RICIPUTI, L.R., JACOBS, G.K., AND NANEY, M.T., 1993. Generation of rhyolitic melt in an artificial magma: Implications for fractional crystallization process in natural magmas. J. Volcanol. Geotherm. Res., 57, 157-166.ABSTRACT

HERVIG, R.L. AND DUNBAR, N.W., 1992. Cause of chemical zoning in the Bishop and Bandelier magma chambers. Earth Planet. Sci. Lett., 111, 97-108.ABSTRACT

HORNING, R. R., N. W. DUNBAR, P. R. KYLE, and W. S. BALDRIDGE, 1996, Evolution of igneous veins intruding basanite at El Porticito, Quemado, NM: New Mexico Geology, v. 18, p. 53.

HORNING, R. R., N. W. DUNBAR, P. R. KYLE, and W. S. BALDRIDGE, 1998, Evolution and emplacement of an unusual veined tephrite-basanite intrusion at El Porticito, NM: Geological Society of America Abstracts with Program, v. 30, p. 10.

LOVE, D., F. MALDONADO, B. HALLETT, K. PANTER, C. REYNOLDS, W. MCINTOSH, and N. DUNBAR, 1999, Preliminary geologic map of the Dalies quadrangle, Valencia County, New Mexico: 1999 USGS Middle Rio Grande Basin Study Workshop.

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