Welding of hot pyroclasts in volcanic environments

火山环境中热火山碎屑的焊接

• 批准号: 2870265
• 金额: --
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2870265
• 关键词: Welding; hot; pyroclasts; volcanic; environments

In this project, fieldwork will be undertaken at type field-localities in Gran Canaria (Spain) and Pantelleria (Italy), and with possible extension fieldwork in the Snake River Plain (U.S.A.). These sites all host extensive welded ignimbrites of variable volume, deposited from eruptions of different magnitude, as well as covering the compositional range from rhyolite to phonolite. Detailed textural work on these ignimbrites will allow the student to pose hypotheses about the conditions of welding and rheomorphism in nature. Next, the student will replicate these textures using welding experiments under shear stresses, under load, and in the crystallisation window, using a range of homemade magma compositions in the hot-labs at Durham University. Finally, the student will become proficient with scaled model development and model application in order to interpret their results and to generalise/upscale to magmatic conditions. Taken together, these lines of enquiry will allow the student to make substantial steps forward in our understanding of pyroclast welding in volcanic environments and the deposition of welded ignimbrites from pyroclastic density currents.

在本项目中，将在大加那利岛（西班牙）和潘泰莱里亚（意大利）的典型野外地点进行野外工作，并可能在斯内克河平原（美国）进行扩展野外工作。这些网站都主机广泛焊接熔结凝灰岩的可变体积，沉积从不同规模的喷发，以及覆盖的组成范围从流纹岩到响岩。对这些熔结凝灰岩的详细结构研究将使学生对自然界中的焊接和流变条件提出假设。接下来，学生将复制这些纹理使用剪切应力下，负载下，并在结晶窗口焊接实验，使用一系列自制的岩浆成分在达勒姆大学的热实验室。最后，学生将成为熟练的比例模型开发和模型应用，以解释他们的结果，并概括/升级到岩浆条件。两者合计，这些调查线将使学生在我们的火山环境中的火山碎屑焊接和焊接熔结凝灰岩从火山碎屑密度电流的沉积的理解，取得实质性的进展。