Flow Laws for Quartzo-Feldspathic Aggregates

PI将进行流量的实验测定 单相和多相位错和扩散蠕变规律 石英和长石的集合体， 外推到地壳条件。 这项研究的一个关键因素是 将使用最近开发的熔盐样品组件 由绿色和Borch（1989），它提供了应力敏感性 具有高压能力的气体设备的 在石英中诱导位错蠕变所需的实验， 长石 他们将通过复制 实验，在扩散蠕变的翼梁，在气体装置。 该研究的其他主要特点是（1）确定 石英中位错攀移和蠕变与fH_2O（H ~+）关系 这应该允许人们考虑到 先前观察到的水解弱化的压力依赖性 在推断流动规律的性质，和（2）划定的 石英中不同的位错蠕变状态 实验材料和实验条件 以确保每个机械稳定状态。

The PIs will carry out an experimental determination of flow laws for dislocation and diffusion creep of mono- and polyphase aggregates of quartz of and feldspar which can be reliably extrapolated to crustal conditions. A key element of this study will be use of the molten salt sample assembly developed recently by Green and Borch (1989), which provides the stress sensitivity of a gas apparatus with the capability for high pressure experiments required to induce dislocation creep in quartz and feldspar. They will check this assembly by doing duplicate experiments, on diffusion creep in feldspars, in a gas apparatus. Additional key features of the study are (1) a determination of the fH2O (H+) dependence of dislocation climb and creep in quartz aggregates, which should allow one to take account of the previously observed pressure dependence of hydrolytic weakening in extrapolating flow laws to nature, and (2) delineation of the conditions where different regimes of dislocation creep in quartz are dominant and the experimental materials and conditions necessary to ensure mechanical steady state in each.