Compositional inhomogeneities in a single Icelandic tholeiite flow

Details Compositional inhomogeneities in a single Icelandic tholeiite flow Compositional inhomogeneities in a single Icelandic tholeiite flow

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45...15l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Jan. 1981, p. 15-31.

Statistics

Computation

7

Basalt, Chemical Analysis, Chemical Composition, Geochemistry, Trace Elements, Iceland, Inhomogeneity, Mineralogy, Monte Carlo Method, Sampling, Tables (Data)

Scientific paper

New trace element analyses of 25 basalt samples from a vertical traverse in an 11 m thick flow of Icelandic tholeiite show compositional differences which exceed analytical uncertainties and are random with respect to height. These variations suggest a short-range segregation model in which the amounts of phenocrysts, groundmass materials, and residual liquid vary randomly in different samples of the flow; a least-squares method is applied to determine if these variations reflect different proportions of crystallizing phases and residual liquid. Monte Carlo computations indicate that short-range segregation results in inhomogeneity of a magnitude of interflow compositional differences; this causes incoherence in elements with different geochemical behaviors while preserving coherence in elements of similar behavior.

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