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，旨在记录浮石玻璃和来自意大利弗勒格林油田两个成分分区的火山碎屑矿床的浮石玻璃和矿物的U-Th不平衡特征：坎帕尼亚Ignimbrite和新都会黄色凝灰岩。将使用高精度热电离质谱来记录浮石玻璃的230 Th/232Th特征和U和Th浓度(通过同位素稀释法)，这代表了矿床的成分范围。此外，还将对所选浮石的斑晶(长石、磁铁矿)进行表征。这些数据将被用来记录与利用地球化学和流体动力学模型形成带状地壳岩浆体有关的过程和时间尺度。此外，地球化学和流体动力学模拟的结合为理解地壳岩浆体中化学梯度的发展提供了一种潜在的强有力的方法。

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.