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Meenakshi Wadhwa is a planetary scientist and educator who studies the formation and evolution of the Solar System through the analysis of planetary materials including meteorites, Moon rocks and other extraterrestrial samples returned by spacecraft missions. She is director of the School of Earth and Space Exploration at Arizona State University.
Hypatia is a small stone found in Egypt in 1996. It has been claimed to be both a meteorite and kimberlite debris. It has also been claimed to be the first known specimen of a comet nucleus on Earth, although defying physically-accepted models for hypervelocity processing of organic material. As of November 2023, Hypatia has not been officially classified as a meteorite in the Meteoritical Bulletin, which is tasked with recording all scientifically proven meteorites.
Ernst Kunibert Zinner was an Austrian astrophysicist, known for his pioneering work in the analysis of stardust in the laboratory. He long had a position in the United States at the Laboratory for Space Physics at Washington University in St. Louis, Missouri, where he had earned his doctorate. He came to the United States in the 1960s for graduate work. In addition, Zinner regularly taught at European universities, and other American institutions.
Robert Norman Clayton was a Canadian-American chemist and academic. He was the Enrico Fermi Distinguished Service Professor Emeritus of Chemistry at the University of Chicago. Clayton studied cosmochemistry and held a joint appointment in the university's geophysical sciences department. He was a member of the National Academy of Sciences and was named a fellow of several academic societies, including the Royal Society.
Hadean zircon is the oldest-surviving crustal material from the Earth's earliest geological time period, the Hadean eon, about 4 billion years ago. Zircon is a mineral that is commonly used for radiometric dating because it is highly resistant to chemical changes and appears in the form of small crystals or grains in most igneous and metamorphic host rocks.
Toshiko K. Mayeda was a Japanese American chemist who worked at the Enrico Fermi Institute in the University of Chicago. She worked on climate science and meteorites from 1958 to 2004.
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Hafnium–tungsten dating is a geochronological radiometric dating method utilizing the radioactive decay system of hafnium-182 to tungsten-182. The half-life of the system is 8.9±0.1 million years. Today hafnium-182 is an extinct radionuclide, but the hafnium–tungsten radioactive system is useful in studies of the early Solar system since hafnium is lithophilic while tungsten is moderately siderophilic, which allows the system to be used to date the differentiation of a planet's core. It is also useful in determining the formation times of the parent bodies of iron meteorites.
Gas-rich meteorites are meteorites with high levels of primordial gases, such as helium, neon, argon, krypton, xenon and sometimes other elements. Though these gases are present "in virtually all meteorites," the Fayetteville meteorite has ~2,000,000 x10−8 ccSTP/g helium, or ~2% helium by volume equivalent. In comparison, background level is a few ppm.
References
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- ↑ "Can We Still Learn Something From Apollo 11 Moon Rocks 40 Years Later? | Science 2.0". www.science20.com. 27 August 2014.
- ↑ Zinner, Ernst; Crozaz, Ghislaine (1986-02-17). "A method for the quantitative measurement of rare earth elements in the ion microprobe". International Journal of Mass Spectrometry and Ion Processes. 69 (1): 17–38. doi:10.1016/0168-1176(86)87039-2. ISSN 0168-1176.
- ↑ Crozaz, Ghislaine; Zinner, Ernst (1 April 1985). "Ion probe determinations of the rare earth concentrations of individual meteoritic phosphate grains". Earth and Planetary Science Letters. 73 (1): 41–52. doi:10.1016/0012-821X(85)90033-0.
- ↑ Wadhwa, Meenakshi; Crozaz, Ghislaine (1995-09-01). "Trace and minor elements in minerals of nakhlites and Chassigny: Clues to their petrogenesis". Geochimica et Cosmochimica Acta. 59 (17): 3629–3645. doi:10.1016/0016-7037(95)00228-R. ISSN 0016-7037.
- ↑ Ghislaine, Crozaz; Floss, Christine; Wadhwa, Meenakshi (15 December 2003). "Chemical alteration and REE mobilization in meteorites from hot and cold deserts". Geochimica et Cosmochimica Acta. 67 (24): 4727–4741. doi:10.1016/j.gca.2003.08.008.
- ↑ Biographical Memoirs: V.86. Washington, D.C.: National Academies Press. 2005-08-15. doi:10.17226/11429. ISBN 978-0-309-09304-0.
- ↑ "Crozaz". Honors Program.
- ↑ "Fellows". meteoritical.org.