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oai:gumushane-rdlopen.rawdatalibrary.net:gumushane/147252026-10-22T10:23:03Zopenairecom_gumushane_10000col_gumushane_10001

Magma interaction recorded in plagioclase zoning in granitoid systems, Zigana Granitoid, eastern Pontides, TurkeyKarsli, OrhanAydin, FarukSadiklar, M. BurhanEastern PontidesMafic-felsic magma interactionOscillatory zoningPlagioclaseTurkeyZigana GranitoidPlagioclase crystals characterized by compositional zoning are typical of the Zigana Granitoid (ZG), NE Turkey. The zoned crystals, which show textural equilibrium with the assemblage quartz + plagioclase + K-feldspar + hornblende + biotite + pyroxene, + magnetite + ilmenite, exhibit oscillatory zoning. The zoned plagioclase crystals, ranging in size from 3 to 6 mm, are oval and larger than normal lath-shaped crystals. The zoned crystals are divided petrographically into two main types: (i) crystals zones only at their rims, with spongy cores; and (ii) completely zoned ones. Composition of the zoned crystals ranges from An23 (oligoclase) to An70 (labradorite). Plagioclase crystals with oscillatory zoning are governed by strong substitution mechanisms of Ca2+ ⌊ Na+, Al 3+ ⌊ Sl4+ and weak substitution of Fe3+ for Sl4+. The Fe2O3 (t) (wt %) contents of the subject plagioclases increase with increasing An content. The petrographic and compositional changes from rim to rim (oscillatory zoning), and positive correlation between Fe2O3(t) (wt %) and An (mol %) contents of the zoned plagioclases, suggest recurrent mafic magma injection into a felsic magma chamber, and thus magma interaction as a dominant magmatic process during the evolution of the Zigana Granitoid (ZG).2004Articlehttps://rdlopen.rawdatalibrary.net/r/gumushane/147251300-0985enTurkish Journal of Earth Sciencesinfo:eu-repo/semantics/closedAccessinfo:eu-repo/semantics/articlehttps://gumushane-rdlopen.rawdatalibrary.net/tr/items/gumushane/14725