NORMALLY ZONED OLIVINES FROM SANTORINI, GREECE: EVIDENCE FOR MAGMA MIXING
Creators:Russell, Amy Elizabeth
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Geological Sciences Senior Theses; 1999
Destructive plate-margin magmas are derived from mantle sources that are mixtures of asthenosphere and subducted oceanic lithosphere (Wilson, 1989). Certain geochemical characteristics of these magmas, such as enrichment in large-ion lithophile elements (LILE) relative to high-field strength elements (HFSE), are believed to reflect mantle source region composition and/or mineralogy. In detail, however, it is difficult to relate the geochemistry of destructive plate-margin magmas directly to source region composition and hence to crustal recycling processes because few, if any, of these magmas represent primary, mantle-derived melts. The compositions of most destructive plate-margin magmas have been altered en route to the surface by processes such as fractional crystallization, mixing and assimilation (eg. Leeman and Hawkesworth, 1986; Grove et al. 1988; Hildreth and Moorbath, 1988; Davidson et al. 1990). Clearly, the question is the extent to which the geochemical characteristics of destructive plate margin magmas are inherited from the upper mantle source region or are acquired during ascent through the crust. To address this question, it is necessary to quantitatively evaluate the processes that occur during magma evolution.
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