Pre-eruptive conditions of the Campanian Ignimbrite eruption: Experimental constraints from phase equilibria and volatile solubility studies and its implication for the Campi Flegrei drilling project

Campanian Ignimbrite 喷发前的条件：相平衡和挥发性溶解度研究的实验限制及其对 Campi Flegrei 钻探项目的影响

• 批准号: 166944350
• 负责人: Professor Dr. Harald Behrens
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/166944350?language=en
• 关键词: Pre; eruptive; conditions; Campanian; Ignimbrite

A prerequisite for the understanding and modeling of volcanic and degassing processes at Campi Flegrei is (1) the determination of magma storage conditions, (2) the understanding of magma replenishment processes, especially the composition, temperature, volatile contents of the new magmas injected in magmatic chamber and (3) the simulation of degassing and crystallization processes during magma ascent. So far experimental data and thermodynamic models at elevated pressures and temperatures, allowing us to gain this information, are scarce and can not be directly applied for the phonolitic and trachytic systems of Campi Flegrei. Such information is crucial for the interpretation of drilling products and of observations at the planned drilling site at Campi Flegrei (CFDDP). In this proposal we plan to investigate long term processes in the magma chamber(s), such as crystallization and differentiation, as well as short term processes resulting from new magma inputs occurring in the Campi Flegrei magma chamber prior to eruptions (e.g., degassing, mixing, re-equilibration). Processes during magma ascent from the magma chamber to the surface will be explored in Tübingen (see application of M. Nowak). Different experimental approaches (i.e. phase equilibria, kinetic experiments, solubility of mixed H2O-CO2-Cl-S-bearing volatiles in silicate melts) using trachytic and phonolitic rocks from the Campanian Ignimbrite will be used to investigate magma storage conditions, the properties of end-member magmas before replenishment, as well as the composition of fluids coexisting with melts in the magma chamber. The knowledge of these parameters is crucial to understand and model the evolution of rheological magma properties, fragmentation, eruptive style, which are recorded in the textural patterns of the Campanian Ignimbrite and of the volcanic ashes. The experimental data will provide useful constraints for volcanic hazard assessment at the high risk Campi Flegrei Volcanic Area.

了解和模拟 Campi Flegrei 的火山和脱气过程的先决条件是（1）确定岩浆储存条件，（2）了解岩浆补给过程，特别是注入的新岩浆的成分、温度和挥发物含量。岩浆室和（3）岩浆上升过程中的脱气和结晶过程的模拟迄今为止，在高压和高温下的实验数据和热力学模型还很少，使我们能够获得这些信息。且不能直接应用于 Campi Flegrei 的声石和粗面系统。此类信息对于解释 Campi Flegrei 计划的钻探地点 (CFDDP) 的观测结果至关重要。在本提案中，我们计划进行长期调查。岩浆房中的过程，例如结晶和分化，以及由于喷发前 Campi Flegrei 岩浆房中发生的新岩浆输入而产生的短期过程（例如，岩浆从岩浆房上升到地表的过程将在蒂宾根进行探索（参见 M. Nowak 的应用）。硅酸盐熔体中含有 CO2-Cl-S 的挥发物）将使用来自坎帕尼亚火晶岩的粗面岩和声硅岩进行研究岩浆储存条件、补给前端元岩浆的性质以及与岩浆室中熔体共存的流体的成分。了解这些参数对于理解和模拟岩浆流变性质、破碎、喷发的演变至关重要。风格，记录在坎帕尼亚熔岩和火山灰的结构模式中，实验数据将为高风险 Campi Flegrei 的火山灾害评估提供有用的约束。火山区。