Experimental determination of phase relations in the system KMASH at pressures between 8 and 11 GPa for a better understanding of deeply subducted or delaminated crustal rocks

在 8 至 11 GPa 压力下对 KMASH 系统中的相关系进行实验测定，以便更好地了解深俯冲或分层地壳岩石

• 批准号: 316478574
• 负责人: Dr. Thomas Fockenberg
• 金额: --
• 依托单位: Institut für Geologie, Mineralogie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316478574?language=en
• 关键词: Experimental; determination; phase; relations; system

Synthesis experiments should serve for the determination of phase relations in the chemical system K2O-MgO-Al2O3-SiO2-H2O, the simple system describing pelitic or acidic rocks, at pressures between 8 and 11 GPa and temperatures ranging from 800° up to 1250°C using a walker-type multi-anvil press. The experiments would be conducted in the presence of a small amount of water. Especially in this PT-region previous thermochemical calculations suggest severe changes in the phase relations leading to strong changes in the density of those rocks. Thus, crustal rocks are expected to reach depths of 300 km or more. All experiments may serve also for a recalculation of a thermodynamic data base including phases present at these conditions, which will allow a better prediction of the phase relations, the changes in rocks-density and dehydration behavior of crustal rocks at these ultra-high-pressure conditions.

合成实验应用于确定化学系统 K2O-MgO-Al2O3-SiO2-H2O 中的相关系，这是描述泥质岩或酸性岩石的简单系统，压力在 8 至 11 GPa 之间，温度在 800° 至 1250° 之间C 使用步行器型多砧压力机 实验将在存在少量水的情况下进行，尤其是在之前的 PT 区域。热化学计算表明，相关系的剧烈变化导致这些岩石的密度发生剧烈变化，因此，地壳岩石的深度预计可达 300 公里或更深，所有实验也可用于重新计算包括相在内的热力学数据库。在这些条件下存在，这将有助于更好地预测这些超高压条件下的相关系、岩石密度的变化和地壳岩石的脱水行为。