Super-Earth's Mantle Forming Materials at Static Pressures over 500 GPa and High Temperatures

超过 500 GPa 的静压和高温下超级地球的地幔形成材料

• 批准号: 329508115
• 负责人: Professor Dr. Leonid Dubrovinsky
• 金额: --
• 依托单位: Deutsches Elektronen-Synchrotron (DESY)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/329508115?language=en
• 关键词: Super; Earth; Mantle; Forming; Materials

Iron-bearing silicate perovskite (bridgmanite, Br) and post-perovskite (CaIrO3-structured phase, PPv), and ferropericlase (Mg,Fe)O are considered to be key components of interiors of super-Earths. Understanding the fate of PPv, ferropericlase and their assembly at multimegabar pressures is the first step for revealing the mineralogy of super-Earthstype exoplanets, arguably the most interesting for their similarities with Earth. Studies of the phase relations, chemical stability, and equations of state of materials possibly forming mantles of extraterrestrial super-Earth type planets are essential to model dynamics of their bodies, evolution, and habitable potential. We are going to investigate the behavior of Fe,Mg,Al silicates and oxides utilizing new developments in ultrahigh pressure generation techniques (double stage (dsDAC) and toroidal (tDAC) diamond anvil cells at multimegabar static pressures, coupled with single crystal and powder X-ray diffraction facilities (at PETRA III and ESRF) and synchrotron Mossbauer source (SMS, ESRF). We expect to collect comprehensive mineral physics data on crystal structures, phase transformations, phase relations, and equations of state of the major constituents of rocky and super-Earth planets.

含铁硅酸盐钙钛矿(Brigmanite，BR)和后钙钛矿(CaIrO_3结构相，PPV)和铁方镁石(Mg，Fe)O被认为是超级地球内部的关键成分。了解PPV、铁方镁石及其在几兆巴压力下的组装的命运是揭示超地球类型系外行星矿物学的第一步，因为它们与地球的相似之处可以说是最有趣的。对可能形成地外超地球类型行星地幔的物质的相关系、化学稳定性和状态方程的研究对于模拟它们的天体动力学、演化和宜居潜力是必不可少的。我们将利用超高压产生技术的新发展来研究铁、镁、铝硅酸盐和氧化物的行为(双级(DsDAC)和环状(TDAC)钻石顶压室在几兆巴静压下，结合单晶和粉末X射线衍射设备(在Petra III和ESRF)和同步加速器穆斯堡尔源(SMS，ESRF))。我们希望收集关于岩石行星和超地球行星主要成分的晶体结构、相变、相关系和状态方程的全面矿物物理数据。