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.

合成实验应有助于确定化学系统K2 O-MgO-Al 2 O3-SiO2-H2O的相关系，这是一个描述泥质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°C之间，使用步行式多砧压机。实验将在少量水的存在下进行。特别是在这个PT区域以前的热化学计算表明，严重的变化，导致强烈的变化，这些岩石的密度的相位关系。因此，地壳岩石预计将达到300公里或更深。所有实验也可用于重新计算热力学数据库，包括在这些条件下存在的相，这将允许更好地预测在这些超高压条件下地壳岩石的相关系、岩石密度变化和脱水行为。