Stability and structures of hydrous minerals in the transition zone of the Martian mantle

火星地幔过渡带含水矿物的稳定性和结构

• 批准号: 18243496
• 负责人: Professor Dr. Daniel J. Frost
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/18243496?language=en
• 关键词: Stability; structures; hydrous; minerals; transition

This research project is aimed at studying the stability and structures of hydrous minerals in the transition zone of the Martian mantle. Hydrous mantle phases will be synthesized in the MgO-FeO(Fe2O3)-SiO2-H2O system at pressures > 10 GPa, using the multi-anvil apparatus. The stability of hydrous phases with iron-rich compositions relevant to the Martian mantle has so far not been explored and potentially new phases could be discovered in this system. Phase identification and characterization will be performed using X-ray diffraction and, in particular, analytical transmission electron microscopy. The TEM examination will involve the determination of the valence state of iron by electron energy-loss spectroscopy (EELS), providing insights into the crystal chemistry of phases and incorporation mechanism of water. To determine the water storage capacity of hydrous phases, the water concentrations will be quantified by IR spectroscopy and directly coupled evolved gas analysis (DEGAS). These data are of fundamental importance for understanding the present and past water cycle and water inventory of Mars. The study may provide explanations for the formation of an ancient ocean, and huge canyons and outflow channels on the surface of Mars that are possibly due to early release of water from a once wet Martian interior.

该研究项目旨在研究火星地​​幔过渡区中含水矿物的稳定性和结构。含水地幔相将在使用多动型设备的MGO-FEO（FE2O3）-SIO2-H2O系统中合成（FE2O3）-SIO2-H2O系统。到目前为止尚未探索与火星披风相关的含水富集的含水相的稳定性，并且在该系统中可能会发现潜在的新阶段。相位识别和表征将使用X射线衍射，尤其是分析透射电子显微镜进行。 TEM检查将涉及通过电子损失光谱（EELS）来确定铁的价值状态，从而提供了对相化学的见解和水的掺入机理。为了确定含水相的储能能力，将通过红外光谱和直接耦合进化气体分析（DEGA）来量化水浓度。这些数据对于理解火星的当前和过去水周期和水清单至关重要。该研究可能会为形成古老的海洋的形成，以及火星表面上的巨大峡谷和流出通道，这可能是由于曾经潮湿的火星内部早期释放了水。