Experimental deformation of (Mg,Fe)O ferropericlase at high-pressure and simultaneously high-temperatures

(Mg,Fe)O 方镁石在高压高温下的实验变形

• 批准号: 275722583
• 负责人: Dr. Hauke Marquardt
• 金额: --
• 依托单位: Deutsches Elektronen-Synchrotron (DESY)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/275722583?language=en
• 关键词: Experimental; deformation; Mg; Fe; ferropericlase

(Mg,Fe)O ferropericlase is the second most abundant mineral of Earths lower mantle. It is considered to be rheologically weaker than bridgmanite, the most abundant mineral of the lower mantle. This relative weakness can lead to strain partitioning into ferropericlase in large strain areas of the mantle, such as in boundary layers or areas around subducting slabs. In this scenario, the deformation behavior of ferropericlase will govern the bulk deformation of the mantle. This proposal aims at studying the deformation behaviour of (Mg,Fe)O ferropericlase at simultaneously high-pressure and high-temperatures, approaching the conditions relevant to Earths lower mantle. Measurements will be performed by using synchrotron radial x-ray diffraction in a graphite resistive-heated diamond-anvil cell employing a dedicated experimental setup that is now available at the Extreme Conditions Beamline of PETRA III (DESY). The expected outcome will impact on several key questions regarding the structure and dynamics of Earths lower mantle, including the fate of subducting slabs and the interpretation of seismic anisotropy observations in the D`` layer above the core mantle boundary.

（Mg，Fe）纤维化酶是地球下地幔的第二大矿物。它在流变学上比Bridgmanite弱，Bridgmanite是下地幔中最丰富的矿物。这种相对弱点会导致在地幔的大应变区域（例如在边界层或俯冲板周围的区域）中的菌株分配到纤维化酶中。在这种情况下，铁磷酸盐酶的变形行为将控制地幔的大部分变形。该建议旨在研究（Mg，fe）的纤维化酶在同时高压和高温下的变形行为，以接近与地球较低地幔相关的条件。将通过在石墨电阻加热的钻石 - 大小细胞中使用同步径向X射线衍射来进行测量，该钻石 - Anvil细胞使用专用的实验设置，该设置现已在Petra III（DESY）的极端条件梁线上可用。预期结果将影响有关地幔较低地幔的结构和动力学的几个关键问题，包括俯冲板的命运以及在核心地幔边界上方的d“层中的地震各向异性观测值的解释。