Geochemical constraints on coupled assimilation and fractional crystallization involving upper crustal compositions and continental tholeiitic magma

Details Geochemical constraints on coupled assimilation and fractional crystallization involving upper crustal compositions and continental tholeiitic magma Geochemical constraints on coupled assimilation and fractional crystallization involving upper crustal compositions and continental tholeiitic magma

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92...70m&link_type=abstract

Earth and Planetary Science Letters, Volume 92, Issue 1, p. 70-80.

Computer Science

8

Scientific paper

The commonly analyzed trace elements in tholeiites can be subdivided into three groups depending on their sense of enrichment or depletion in upper continental crust in relation to fractional crystallization. Lithophile incompatible elements are enriched in crustal rocks and by fractional crystallization, whereas compatible transition elements such as Ni and Cr are depleted. A small third group comprising Ti, V, Fe, and sometimes P, enrich with crystallization but are depleted in the crust. The behaviour of elements from these three groups is influenced in different ways by the variables in assimilation-fractional crystallization processes (AFC). An evaluation of these influences suggests that lithophile incompatible element variations may not be as useful for constraining AFC in tholeiites as the elements V, Ti, etc. AFC modelling should use elements from all of these groups. In addition, the R and F parameters obtained by trace element and isotopic modelling should be checked for consistency with major element data by using published numerical phase equilibria models. The latter can also provide estimates of the fractionating mode which is necessary for calculating bulk distribution coefficients for AFC models. As an example, the Etendeka suite of Namibia is used to demonstrate the power of V-isotope ratio plots over those of Rb-isotope ratio for constraining AFC parameters, and the importance of checking R and F against major element variations.

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