Early Career: Acquisition of a High Sensitivity Superconducting Rock Magnetometer for Paleomagnetic and Paleointensity Research

1160854 smirnovs地球科学部仪器和设施计划拨款支持在密歇根理工大学购买2G企业4K-755高分辨率超导岩石磁力计（SRM），该磁力计具有小通径（6毫米）。小孔径SRM可以对含有磁性和顺磁性细粒矿物包裹体的古代（前寒武纪）硅酸盐单晶进行古地磁定向和古强度分析。这些火成岩单晶可能保存着地球最原始的记录？迄今为止，对前寒武纪岩石进行的可靠的古强度测量很少。现在小口径SRM的分析灵敏度使所提出的测量成为可能。PI拥有许多来自世界各地前寒武纪岩脉样本的斜长石分离物（例如：~2.45 Ga Burakovka岩脉（俄罗斯），~2.9 Ga Munni-Munni侵入岩和~2.42 Ga Widgiemooltha岩脉（西澳大利亚），~2.37 Ga Bangalore岩脉和~2.2 Ga Mahhubnagar岩脉（印度），以及~1.1 Ga Portage Lake玄武岩（美国）），这些岩脉是由NSF/EAR研究支持的。PI已经准备好立即使用所要求的小口径SRM进行NSF/EAR资助的地球性质研究。早期磁场与前寒武纪构造和地球动力学的产生和早期行为的关系；保护地球表面不受高能太阳风影响并允许地球进化的磁场？年代的生物群。该仪器将是美国学术实验室中同类仪器中的第二台。此次收购对美国古地磁研究界的基础设施影响非常重大。该仪器将补充现有的PI？并服务于一个活跃的学生研究小组，包括一个活跃的pi -本科生指导计划

1160854SmirnovThis Division of Earth Sciences Instrumentation and Facilities Program grant supports acquisition of a 2G Enterprises 4K-755 high-resolution superconducting rock magnetometer (SRM) with a small access bore (6 mm) at Michigan Technological University. The small bore SRM allows for paleomagnetic directional and paleointensity analysis of single crystals of ancient (Precambrian) silicates hosting magnetic and paramagnetic fine grained mineral inclusions. These igneous phase single crystals are likely to hold the most pristine record of Earth?s early magnetic field and yet to date very few reliable paleointensity measurements from Precambrian rocks have been made. The analytical sensitivity now available with a small bore SRM makes proposed measurements possible. The PI is in possession of numerous plagioclase separates from Precambrian dikes sampled around the word (e.g., the ~2.45 Ga Burakovka dikes (Russia), the ~2.9 Ga Munni-Munni intrusion and the ~2.42 Ga Widgiemooltha dikes (Western Australia), the ~2.37 Ga Bangalore dikes and the ~2.2 Ga Mahhubnagar dikes (India), and the ~1.1 Ga Portage Lake basalts (USA)) from previous NSF/EAR research support. The PI is well poised to immediately make use of the requested small bore SRM for NSF/EAR funded research on the nature of Earth?s early magnetic field with implications for Precambrian tectonics and the generation and early behavior of the geodynamo; the magnetic field which shields the Earth surface from the highly energized solar wind and allowed for the evolution of Earth?s biota. This instrument will be only the second of its kind in a U.S. academic laboratory. The infrastructural impacts of this acquisition are very significant for the U.S. paleomagnetic research community. The instrument will complement existing paleomagnetic analysis equipment in the PI?s lab and serve an active student research group including an active PI-undergraduate mentoring program at MTU.***