Processes and Rates of Compositional Zonation in Crustal Magma Bodies: Constraints From High-Precision U-Th Disequilibria

9418720 Bohrson这是一个为期两年的项目，记录来自意大利Phlegrean油田两个成分分区火山碎屑沉积物的浮石玻璃和矿物的U-Th不平衡特征：Campanian火山灰岩和Neopolitan黄色凝灰岩。 将使用高精度热电离质谱仪记录代表矿床成分范围的浮石玻璃的230 Th/232 Th特征和U和Th浓度（通过同位素稀释）。 此外，斑晶（长石，磁铁矿），从选定的浮石也将进行表征。 这些数据将用于使用地球化学和流体动力学建模来记录与分区地壳岩浆体生成相关的过程和时间尺度。 此外，地球化学和流体动力学模拟的集成代表了一个潜在的强大的方法来了解地壳岩浆体的化学梯度的发展。

9418720 Bohrson This is a two year project to document U-Th disequilibria characteristics of pumice glass and minerals from two compositionally zoned pyroclastic deposits from the Phlegrean Fields, Italy: the Campanian Ignimbrite and the Neopolitan Yellow Tuff. High-precision thermal ionization mass spectrometry will be used to document the 230Th/232Th characteristics and U and Th concentrations (by isotope dilution) of pumice glass that represents the compositional ranges of the deposits. In addition, phenocrysts (feldspar, magnetite) from selected pumice will also be characterized. These data will be used to document processes and timescales associated with the generation of zoned crustal magma bodies using geochemical and fluid dynamical modeling. In addition, the integration of geochemical and fluid dynamical modeling represents a potentially powerful approach for understanding the development of chemical gradients in crustal magma bodies.