The Role of Breccia Lenses in Regolith Generation From the Formation of Small, Simple Craters: Application to the Apollo 15 Landing Site.
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| Title: | The Role of Breccia Lenses in Regolith Generation From the Formation of Small, Simple Craters: Application to the Apollo 15 Landing Site. |
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| Authors: | Hirabayashi, M.1 thirabayashi@auburn.edu, Howl, B. A.2, Fassett, C. I.3, Soderblom, J. M.4, Minton, D. A.2, Melosh, H. J.2 |
| Source: | Journal of Geophysical Research. Planets. Feb2018, Vol. 123 Issue 2, p527-543. 17p. |
| Abstract: | Abstract: Impact cratering is likely a primary agent of regolith generation on airless bodies. Regolith production via impact cratering has long been a key topic of study since the Apollo era. The evolution of regolith due to impact cratering, however, is not well understood. A better formulation is needed to help quantify the formation mechanism and timescale of regolith evolution. Here we propose an analytically derived stochastic model that describes the evolution of regolith generated by small, simple craters. We account for ejecta blanketing as well as regolith infilling of the transient crater cavity. Our results show that the regolith infilling plays a key role in producing regolith. Our model demonstrates that because of the stochastic nature of impact cratering, the regolith thickness varies laterally, which is consistent with earlier work. We apply this analytical model to the regolith evolution at the Apollo 15 site. The regolith thickness is computed considering the observed crater size‐frequency distribution of small, simple lunar craters (< 381 m in radius for ejecta blanketing and <100 m in radius for the regolith infilling). Allowing for some amount of regolith coming from the outside of the area, our result is consistent with an empirical result from the Apollo 15 seismic experiment. Finally, we find that the timescale of regolith growth is longer than that of crater equilibrium, implying that even if crater equilibrium is observed on a cratered surface, it is likely that the regolith thickness is still evolving due to additional impact craters. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 128483265 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The Role of Breccia Lenses in Regolith Generation From the Formation of Small, Simple Craters: Application to the Apollo 15 Landing Site. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hirabayashi%2C+M%2E%22">Hirabayashi, M.</searchLink><relatesTo>1</relatesTo><i> thirabayashi@auburn.edu</i><br /><searchLink fieldCode="AR" term="%22Howl%2C+B%2E+A%2E%22">Howl, B. A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fassett%2C+C%2E+I%2E%22">Fassett, C. I.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Soderblom%2C+J%2E+M%2E%22">Soderblom, J. M.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Minton%2C+D%2E+A%2E%22">Minton, D. A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Melosh%2C+H%2E+J%2E%22">Melosh, H. J.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Planets%22">Journal of Geophysical Research. Planets</searchLink>. Feb2018, Vol. 123 Issue 2, p527-543. 17p. – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Impact cratering is likely a primary agent of regolith generation on airless bodies. Regolith production via impact cratering has long been a key topic of study since the Apollo era. The evolution of regolith due to impact cratering, however, is not well understood. A better formulation is needed to help quantify the formation mechanism and timescale of regolith evolution. Here we propose an analytically derived stochastic model that describes the evolution of regolith generated by small, simple craters. We account for ejecta blanketing as well as regolith infilling of the transient crater cavity. Our results show that the regolith infilling plays a key role in producing regolith. Our model demonstrates that because of the stochastic nature of impact cratering, the regolith thickness varies laterally, which is consistent with earlier work. We apply this analytical model to the regolith evolution at the Apollo 15 site. The regolith thickness is computed considering the observed crater size‐frequency distribution of small, simple lunar craters (< 381 m in radius for ejecta blanketing and <100 m in radius for the regolith infilling). Allowing for some amount of regolith coming from the outside of the area, our result is consistent with an empirical result from the Apollo 15 seismic experiment. Finally, we find that the timescale of regolith growth is longer than that of crater equilibrium, implying that even if crater equilibrium is observed on a cratered surface, it is likely that the regolith thickness is still evolving due to additional impact craters. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/2017JE005377 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 527 Titles: – TitleFull: The Role of Breccia Lenses in Regolith Generation From the Formation of Small, Simple Craters: Application to the Apollo 15 Landing Site. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hirabayashi, M. – PersonEntity: Name: NameFull: Howl, B. A. – PersonEntity: Name: NameFull: Fassett, C. I. – PersonEntity: Name: NameFull: Soderblom, J. M. – PersonEntity: Name: NameFull: Minton, D. A. – PersonEntity: Name: NameFull: Melosh, H. J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 21699097 Numbering: – Type: volume Value: 123 – Type: issue Value: 2 Titles: – TitleFull: Journal of Geophysical Research. Planets Type: main |
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