An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites
Abstract Almahata Sitta is a polymict breccia, consisting of many kinds of clasts. Here we present our mineralogical and petrological results on an EL3 fragment, MS-177 from Almahata Sitta. This fragment shows a typical type 3 chondritic texture, consisting of well-defined chondrules, isolated silic...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-10-01
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| Series: | Progress in Earth and Planetary Science |
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| Online Access: | https://doi.org/10.1186/s40645-021-00447-2 |
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| author | M. Kimura M. K. Weisberg A. Takaki N. Imae A. Yamaguchi |
| author_facet | M. Kimura M. K. Weisberg A. Takaki N. Imae A. Yamaguchi |
| author_sort | M. Kimura |
| collection | DOAJ |
| description | Abstract Almahata Sitta is a polymict breccia, consisting of many kinds of clasts. Here we present our mineralogical and petrological results on an EL3 fragment, MS-177 from Almahata Sitta. This fragment shows a typical type 3 chondritic texture, consisting of well-defined chondrules, isolated silicate minerals, and opaque nodules. Most chondrules are enstatite-rich with some having olivine. Although these components are typical of EL3 chondrites, the mineral abundances and compositions are different from the other EL3s. Diopside is unusually abundant in MS-177. On the other hand, perryite and daubreelite were not found. The major pyroxene is orthoenstatite, and the silica phase is quartz. Fe–Ni metal has relatively high P contents. Troilite is enriched in Cr and Mn. Keilite and buseckite are present in MS-177. From the mineralogy and texture, MS-177 experienced a high-temperature event under subsolidus conditions. Shock-induced heating for a short duration might explain this high-temperature event. We suggest that other E3 chondrites also experienced heating events under such subsolidus conditions on their parent bodies. On the other hand, the high abundance of diopside cannot be explained by a secondary thermal event and may have been a primary feature of MS-177, formed before accretion to the parent body. |
| first_indexed | 2024-12-13T23:02:10Z |
| format | Article |
| id | doaj.art-a7705c44f97447e196323771f8b0b77c |
| institution | Directory Open Access Journal |
| issn | 2197-4284 |
| language | English |
| last_indexed | 2024-12-13T23:02:10Z |
| publishDate | 2021-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Progress in Earth and Planetary Science |
| spelling | doaj.art-a7705c44f97447e196323771f8b0b77c2022-12-21T23:28:23ZengSpringerOpenProgress in Earth and Planetary Science2197-42842021-10-018111210.1186/s40645-021-00447-2An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondritesM. Kimura0M. K. Weisberg1A. Takaki2N. Imae3A. Yamaguchi4National Institute of Polar ResearchKingsborough College and Graduate Center of the City University of New YorkIbaraki UniversityNational Institute of Polar ResearchNational Institute of Polar ResearchAbstract Almahata Sitta is a polymict breccia, consisting of many kinds of clasts. Here we present our mineralogical and petrological results on an EL3 fragment, MS-177 from Almahata Sitta. This fragment shows a typical type 3 chondritic texture, consisting of well-defined chondrules, isolated silicate minerals, and opaque nodules. Most chondrules are enstatite-rich with some having olivine. Although these components are typical of EL3 chondrites, the mineral abundances and compositions are different from the other EL3s. Diopside is unusually abundant in MS-177. On the other hand, perryite and daubreelite were not found. The major pyroxene is orthoenstatite, and the silica phase is quartz. Fe–Ni metal has relatively high P contents. Troilite is enriched in Cr and Mn. Keilite and buseckite are present in MS-177. From the mineralogy and texture, MS-177 experienced a high-temperature event under subsolidus conditions. Shock-induced heating for a short duration might explain this high-temperature event. We suggest that other E3 chondrites also experienced heating events under such subsolidus conditions on their parent bodies. On the other hand, the high abundance of diopside cannot be explained by a secondary thermal event and may have been a primary feature of MS-177, formed before accretion to the parent body.https://doi.org/10.1186/s40645-021-00447-2Enstatite chondriteBrecciaThermal historyOpaque minerals |
| spellingShingle | M. Kimura M. K. Weisberg A. Takaki N. Imae A. Yamaguchi An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites Progress in Earth and Planetary Science Enstatite chondrite Breccia Thermal history Opaque minerals |
| title | An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites |
| title_full | An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites |
| title_fullStr | An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites |
| title_full_unstemmed | An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites |
| title_short | An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites |
| title_sort | almahata sitta el3 fragment implications for the complex thermal history of enstatite chondrites |
| topic | Enstatite chondrite Breccia Thermal history Opaque minerals |
| url | https://doi.org/10.1186/s40645-021-00447-2 |
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