87Sr/86Sr, alkali and alkaline earth element geochemistry of Chichinautzin Sierra, Mexico.
Por:
Verma S.P., Armienta-H M.A.
Publicada:
1 ene 1985
Resumen:
Alkali (K, Rb and Cs) and alkaline earth (Ba and Sr) contents, as well as 87Sr/86Sr ratios, are reported for eight selected basalt and andesite samples and for one older dacite. Trace-element data are compatible with fractional crystallization of hornblende, plagioclase, olivine and pyroxenes - in approx decreasing importance. Initial 87Sr/86Sr ratios range 0.7034-0.7045; in the light of this and other evidence a mantle origin with only a small contribution from altered oceanic or sialic continental crust is favoured for the Chichinautzin magmas.-J.M.H.
Filiaciones:
Verma S.P.:
Depto. de Geotermia, Div. de Fuentes de Energia, Inst. de Investigaciones Electricas, A.P. 475, Cuernavaca, Mor. 62000, Mexico., Mexico
Armienta-H M.A.:
Depto. de Geotermia, Div. de Fuentes de Energia, Inst. de Investigaciones Electricas, A.P. 475, Cuernavaca, Mor. 62000, Mexico., Mexico
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