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。石榴石中涉及锆钛的关键化学反应将作为温压计进行经验和实验校准，并应用于不同变质地体中的带状石榴石。利用缓冲的新英格兰石榴石的SIMS数据对GZQ和GRQ进行经验校准，将结合热力学估计和计算，得到临时相图。GZQ反应将用加州大学洛杉矶分校(曼宁)的活塞-圆柱体装置进行实验校准，通过成分逆转和Oak Ridge Sims(Riciputi)对运行产物的分析。Manning、Bohlen和他的同事已经对石榴石-金红石-石英和石榴石-金红石-刚玉-硅线石进行的实验将用电子探针评估它们对GRQ校准的适用性。将使用SIMS和EMP数据对格林维尔地体和新英格兰地区精选的石榴石-独居石和石榴石-绿帘石对进行稀土元素和Y的KD测温的经验校准。GZQ和GRQ气压测量与REE KD测温相结合，为获得更完整的麻粒岩地体经历的P-T-t轨迹提供了很大的潜力，并有助于阐明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.