Collaborative Research: Calibration and Application of Trace Element Thermobarometry in Metamorphic Rocks

9706349 Essene 这是 Essene、Manning 和 Riciputi 之间的合作项目。石榴石中涉及 Zr 和 Ti 的关键化学反应将作为温压计进行经验和实验校准，并应用于各种变质岩中的分区石榴石。 使用缓冲新英格兰石榴石 SIMS 数据测量的 Zr 和 Ti 水平对 GZQ 和 GRQ 进行经验校准，将与热力学估计和计算相结合，以生成临时相图。 GZQ 反应将使用 UCLA（曼宁）的活塞缸装置进行实验校准，并由 Oak Ridge SIMS（Riciputi）进行成分反转和运行产物分析。 Manning、Bohlen 及其同事已经在石榴石-金红石-石英和石榴石-金红石-刚玉-硅线石上进行的实验将使用电子微探针对其在 GRQ 校准中的适用性进行评估。将使用 SIMS 和 EMP 数据对来自格林维尔地体和新英格兰的选定石榴石-独居石和石榴石-绿帘石对进行 REE 和 Y 的 KD 测温的经验校准。 GZQ 和 GRQ 气压测量与 REE KD 测温的结合为获得麻粒岩地体经历的更完整的 P-T-t 路径提供了强大的潜力，并且应该阐明负责麻粒岩相成因的机制。

9706349 Essene This is a collaborative project between Essene, Manning and Riciputi. Key chemical reactions involving Zr and Ti in garnets will be calibrated both empirically and experimentally as thermobarometers and applied to zoned garnets in various metamorphic terranes. Empirical calibration of GZQ and GRQ using measured Zr and Ti levels from SIMS data for buffered New England garnets will be combined with thermodynamic estimations and calculations to yield provisional phase diagrams. The GZQ reaction will be calibrated experimentally with a piston-cylinder apparatus at UCLA (Manning) with compositional reversals and analysis of run products by Oak Ridge SIMS (Riciputi). Experiments on garnet-rutile-quartz and garnet-rutile-corumdum-sillimanite that have already been conducted by Manning, Bohlen and coworkers will be evaluated with the electron microprobe for their applicability to calibration of GRQ. Empirical calibration of KD thermometry for REE's and Y will be undertaken for selected garnet-monazite and garnet-epidote pairs from Greenville terrane and from New England using SIMS and EMP data. Combination of GZQ and GRQ barometry with REE KD thermometry offers a strong potential for obtaining more complete P-T-t paths experienced by granulite terranes and should elucidate mechanisms responsible for granulite facies genesis.