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

9706349 Esplanet这是Esplanet，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热压计根据经验和实验进行校准，并应用于各种变质岩石中的分区石榴石。 使用缓冲新英格兰石榴石西姆斯数据中测得的Zr和Ti水平对GZQ和GRQ进行经验校准，并结合热力学估计和计算，以生成临时相图。GZQ反应将在UCLA（Manning）使用活塞-气缸装置进行实验校准，并通过橡树岭西姆斯（Riciputi）进行成分反转和运行产物分析。Manning、Bohlen及其同事已经进行的石榴石-金红石-石英和石榴石-金红石-刚玉-硅线石的实验将用电子探针评估它们对GRQ校准的适用性。将利用西姆斯和EMP数据对格林维尔和新英格兰的石榴石-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。结合GZQ和GRQ气压与REE KD测温提供了一个强大的潜力，获得更完整的P-T-t路径经历的麻粒岩相成因机制，并应阐明。

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.