CSEDI Initiative: Study of Natural Majorite, An Inter-Laboratory/Technique Comparison (Collaborative Research)

[305219] Jeanloz该奖项支持一项为期2年的合作研究计划，旨在阐明镁辉石的弹性特性，镁辉石是石榴石结构的高压相，是地幔过渡带的重要组成部分。这项研究将检查先前有争议的测量结果，确定镁铁石的性质是否对组成、晶体结构、排列或起源的细节异常敏感。解决这一问题对于理解地幔过渡带的地球物理性质至关重要。这项工作还将为两个实验室之间以及测定多晶聚集体弹性特性的两种方法（布里渊光谱法和静态压缩法）之间提供重要的交叉检查。通过现代化学和物理微观分析技术，将首次向社会提供过渡带高压相的天然样品进行补充研究。＊＊＊

9305219 Jeanloz This award supports a 2-year collaborative research program intended to elucidate the elastic properties of majorite, the garnet-structured high-pressure phase of pyroxene that is an important constituent of the transition zone in the Earth's mantle. The study would check previous measurements that are controversial, resolving whether or not the properties of majorite are anomalously sensitive to details of composition, crystallographic structure, ordering or origin. Resolving this issue is critical to understanding the geophysical properties of the mantle transition zone. The work would also provide a significant cross-check between two laboratories and between two methods of determining elastic properties on polycrystalline aggregates, Brillouin spectroscopy and static compression. For the first time, natural samples of transition-zone high-pressure phases would be made available to the community for complementary studies through modern techniques of chemical and physical micro- analysis. ***