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首页> 外文期刊>Contributions to Mineralogy and Petrology >The role of crustal contamination in the petrogenesis of nepheline syenite to granite magmas in the Ditru Complex, Romania: evidence from O-, Nd-, Sr- and Pb-isotopes
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The role of crustal contamination in the petrogenesis of nepheline syenite to granite magmas in the Ditru Complex, Romania: evidence from O-, Nd-, Sr- and Pb-isotopes

机译：地壳污染在罗马尼亚Ditru Complex中对尼触岩石岩石岩石岩石岩浆的作用：来自O-，ND-，SR-和PB-Isotopes的证据

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The Ditru Complex of the Carpathian Mountains in Romania is a Mesozoic igneous complex (similar to 200-230 Ma) generated in a continental rift environment. Felsic rocks of the Ditru Complex consist of nepheline syenite, syenite, quartz syenite, quartz monzonite, monzonite and granite. The Ditru rocks have mantle-like Nd values that range from+0.8 to+5.5 parts per thousand. High-temperature equilibrium O-isotope fractionations between minerals are generally preserved, although some subsolidus O-isotope re-equilibration occurred. Magma delta O-18 values estimated from quartz, feldspar and amphibole (5.7-11.7 parts per thousand) are higher than those estimated from zircon. We suggest that this difference results from continuous crustal contamination, with zircon recording the early, high-temperature delta O-18 values, and quartz and the other silicate delta O-18 values, reflecting a combination of subsequent crustal contamination and deuteric alteration. Negative correlations between calculated magma delta O-18 values and Na2O and Al2O3 content and epsilon Nd are consistent with the spectrum of felsic rocks from nepheline syenite to granite resulting from an increase crustal input. Both O- and Nd-isotope compositions are consistent with a dominantly mantle origin of hornblendites, diorites and nepheline syenites. The Nd- and O-isotope composition of the silica-oversaturated rocks can be explained by the assimilation of 20-60% upper crustal melts into the re-injected mafic alkaline parent magma to generate the Ditru syenites, quartz syenites, quartz monzonites and granites.
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