NSFGEO-NERC: An investigation of the possible co-evolution of Si and O isotopes in rocks and minerals from the Hadean to present

GSTDTAP

项目编号	NE/R002134/1
	NSFGEO-NERC: An investigation of the possible co-evolution of Si and O isotopes in rocks and minerals from the Hadean to present
	Paul Simon Savage
主持机构	University of St Andrews
项目开始年	2017
	2017-06-01
项目结束日期	2020-05-31
资助机构	UK-NERC
项目类别	Research Grant
国家	英国
语种	英语
英文摘要	Project Summary Overview This project involves the design, execution, and application of high temperature and high pressure laboratory experiments to understand the isotope geochemistry of natural mineral samples. Specifically, this research will explore Si- and O-isotope geochemistry of igneous rocks and minerals - including detrital zircon - with three integrated objectives. This first involves systematic experimental work to quantify Si isotope equilibrium fractionation among co-existing minerals at igneous temperatures, including zircon, quartz, and feldspars. Second, these experiments will be used as a stepping stone to interpret Si- and O- isotope geochemistry of whole rock and mineral samples. Finally, the project will focus specifically on applying the results of experiments and natural, in-context, samples to detrital zircon samples to decipher the environments of crystallization. Zircons older than 4 billion years represent a key target for application because rocks from this time period are either sparse or altogether absent. This work will therefore result in new knowledge about the environments and conditions that may have prevailed on the earliest Earth. Intellectual merit This research is intellectually meritorious because it will result in: (i) the first published experimental data for Si isotope fractionation for igneous minerals and will fill a key gap in knowledge that will enable researchers to understand Si isotopes in igneous rocks on firmer ground; (ii) a systematic comparison of the possible co-variation of O- and Si- isotopes in natural rocks and minerals; (iii) and the first in-situ data for Si isotopes in zircon, which will be investigated along with O-isotopes. Silicon isotopes in zircon will offer a new way to explore crustal evolution from the Hadean onwards. When coupled with oxygen isotope work, these two systems could lead to yield new ways to peer into sedimentary cycling and to explore early Earth magmas from before the existence of the known sedimentary or igneous rock record. Broader impacts The broader impacts of this project come from the training of undergraduate and graduate students in high temperature experimental techniques and crystal synthesis, and isotope analysis. The practical training on these instruments will result in a broad skillset, highly applicable to many areas in the geosciences. The students will also have the opportunity to attend and network at national and international scientific conferences. As part of the broader impacts of this grant, we will also host high school science teachers from the surrounding Rochester area to introduce them to the technology and the science we undertake in the Early Earth and Experimental Geochemistry Laboratory at Rochester. These 2-3 day summer workshops expose science teachers to cutting edge science and technology and data that they can take back into their classrooms. Finally, at St Andrews, the co-PI will initiate a meeting of an international science outreach scheme, aimed at presenting cutting-edge research outside of the classroom environment, to the general public.
来源学科分类	Natural Environment Research
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/86711
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Paul Simon Savage.NSFGEO-NERC: An investigation of the possible co-evolution of Si and O isotopes in rocks and minerals from the Hadean to present.2017.