Paleomagnetism of Lonar impact glass
Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2008.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2018
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| Online Access: | http://hdl.handle.net/1721.1/114356 |
| _version_ | 1826215182260502528 |
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| author | Pedersen, Shelsea A. (Shelsea Anne) |
| author2 | Bejamin P. Weiss. |
| author_facet | Bejamin P. Weiss. Pedersen, Shelsea A. (Shelsea Anne) |
| author_sort | Pedersen, Shelsea A. (Shelsea Anne) |
| collection | MIT |
| description | Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2008. |
| first_indexed | 2024-09-23T16:18:05Z |
| format | Thesis |
| id | mit-1721.1/114356 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:18:05Z |
| publishDate | 2018 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1143562019-04-11T00:00:36Z Paleomagnetism of Lonar impact glass Pedersen, Shelsea A. (Shelsea Anne) Bejamin P. Weiss. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2008. Cataloged from PDF version of thesis. Includes bibliographical references (pages 65-68). Several dozen impact glasses from Lonar Crater, in Maharashtra, India, were analyzed for evidence of impact-generated paleofields, and possible motional remanent magnetization. Lonar Crater formed when a meteorite impacted a bed of Deccan Trap basalts. Upon impact, the basalt was super heated into a fluid melt that would have been ejected from the crater, moving at speeds that allowed the smaller pieces of basalt to cool in mid-air. These smaller pieces would have cooled instantaneously, and due to their ferromagnetic composition may have recorded the presence of an impact generated magnetic field. This paper focuses on analyzing several dozen basaltic glass samples from the perimeter of Lonar Crater that are considered to be some of the most plausible known terrestrial analogs to the lunar impact glasses. Lonar impact glasses could serve as a decent analogue to lunar tektites, although differences in their rotational NRM and grain size suggest that they may not be the best recorders of paleointensity. The impact glasses display clear evidence of a series of wild, directionally unstable magnetic moments when heated to temperatures in excess of 400 to 500°C that are not observed in other terrestrial samples. The simplest explanation for this unusual behavior is that these randomized magnetic moments are the result of the progessive removal of different magnetization moments that had, up until the higher temperatures, been blocked in. Upon their removal, these randomized high temperature moments were revealed. Based on the NRM/sIRM ratios of the splash-form spherules the glasses slightly underestimate the intensity of the field in which they cooled. This underestimate is in part possibly due to the effects of rotation during cooling. Their unique motional remanent magnetization is quite fascinating, but may be detrimental to the spherules' ability to retain a strong enough NRM, preventing them from displaying evidence of an impact-generated paleofield at Lonar Crater. by Shelsea A. Pedersen. S.B. 2018-03-27T14:18:57Z 2018-03-27T14:18:57Z 2008 2008 Thesis http://hdl.handle.net/1721.1/114356 1028980609 eng MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 68 pages application/pdf a-ii--- Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Pedersen, Shelsea A. (Shelsea Anne) Paleomagnetism of Lonar impact glass |
| title | Paleomagnetism of Lonar impact glass |
| title_full | Paleomagnetism of Lonar impact glass |
| title_fullStr | Paleomagnetism of Lonar impact glass |
| title_full_unstemmed | Paleomagnetism of Lonar impact glass |
| title_short | Paleomagnetism of Lonar impact glass |
| title_sort | paleomagnetism of lonar impact glass |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/114356 |
| work_keys_str_mv | AT pedersenshelseaashelseaanne paleomagnetismoflonarimpactglass |