EAGER: Investigating the possibility of low temperature (&lt;700 C) melt in silicic igneous systems

GSTDTAP

项目编号	1919714
	EAGER: Investigating the possibility of low temperature (<700 C) melt in silicic igneous systems
	Craig Lundstrom (Principal Investigator)
主持机构	University of Illinois at Urbana-Champaign
项目开始年	2019
	2019-04-01
项目结束日期	2021-03-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	84669(USD)
国家	美国
语种	英语
英文摘要	The questions of how Earth's crust was made by silicic magmas, and how large volcanoes like Yellowstone erupt, have perplexed geologists for centuries. This project will include collecting new geochemical data from observed volcanic rocks and performing laboratory experiments aimed at assessing the controversial hypothesis that magmas at temperatures of 500 to 550 degrees C play a role in making and erupting silicic melts. The project has potential to make transformative change on views of how silicic magma systems operate with potential impacts including how the continental crust forms, why silicic magmas erupt, and how ore deposits form. This project will train a graduate student, and develop a new device for thermal gradients in a cold seal system that will benefit other experimental petrologists. This exploratory project builds upon the recent finding that hydrous peralkaline melts can coexist with quartz + feldspar at temperatures below the nominal igneous solidus (700 degrees C). Three tasks aimed at assessing the possibility that this low temperature melt exists and plays a role in eruption of silicic magmas are proposed: 1) Assess the role of decompression of low temperature melt in equilibrium with quartz and feldspar by releasing pressure from 1 kb to 0.3 kb and comparing to know phase equilibria; 2) Develop a thermal gradient apparatus using cold seal vessels at 1 kb pressure; 3) Compare the intra mineral isotope ratios of U, Fe and Si from mineral separates of the Fish Canyon Tuff to assess if connections between the making of granites and silicic volcanic rocks can be discerned. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/213804
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Craig Lundstrom .EAGER: Investigating the possibility of low temperature (<700 C) melt in silicic igneous systems.2019.