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

这是Essene、Manning和Riciputi之间的合作项目。涉及石榴石中Zr和Ti的关键化学反应将作为温度表进行经验和实验校准，并应用于各种变质地体中的带状石榴石。利用SIMS数据测量的新英格兰石榴石的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得出临时相图。GZQ反应将在加州大学洛杉矶分校（曼宁）用活塞缸装置进行实验校准，由橡树岭SIMS公司（Riciputi）进行成分逆转和运行产物分析。Manning， Bohlen和同事已经进行的石榴石-金红石-石英和石榴石-金红石-刚玉-硅石石的实验将用电子探针评估其对GRQ校准的适用性。将使用SIMS和EMP数据对Greenville地块和新英格兰选定的石榴石-独居石和石榴石-绿帘石对进行REE和Y的KD测温经验校准。GZQ和GRQ气压测量与REE KD测温相结合，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，并有助于阐明麻粒岩相形成的机制。

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.