| Reference Type | Journal (article/letter/editorial) |
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| Title | U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129 |
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| Journal | Meteoritics & Planetary Science |
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| Authors | Zhou, Qin | Author |
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| Yin, Qing-Zhu | Author |
| Shearer, Charles K. | Author |
| Li, Xian-Hua | Author |
| Li, Qiu-Li | Author |
| Liu, Yu | Author |
| Tang, Guo-Qiang | Author |
| Li, Chun-Lai | Author |
| Year | 2018 (March) | Volume | 53 |
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| Issue | 3 |
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| Publisher | Wiley |
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| DOI | doi:10.1111/maps.13026Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 334841 | Long-form Identifier | mindat:1:5:334841:7 |
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| GUID | 0 |
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| Full Reference | Zhou, Qin, Yin, Qing-Zhu, Shearer, Charles K., Li, Xian-Hua, Li, Qiu-Li, Liu, Yu, Tang, Guo-Qiang, Li, Chun-Lai (2018) U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129. Meteoritics & Planetary Science, 53 (3) 448-466 doi:10.1111/maps.13026 |
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| Plain Text | Zhou, Qin, Yin, Qing-Zhu, Shearer, Charles K., Li, Xian-Hua, Li, Qiu-Li, Liu, Yu, Tang, Guo-Qiang, Li, Chun-Lai (2018) U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129. Meteoritics & Planetary Science, 53 (3) 448-466 doi:10.1111/maps.13026 |
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| In | (2018, March) Meteoritics & Planetary Science Vol. 53 (3) Wiley |
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| Abstract/Notes | The Antarctic achondrite Graves Nunataks 06128 (GRA 06128) and Graves Nunataks 06129 (GRA 06129) represent a unique high-temperature, nonbasaltic magmatism in the early solar system. These objects have been interpreted as products of low-degree partial melting of volatile-rich chondritic material, which may have been the asteroid parent bodies of brachinite. Previous studies have investigated their crystallization and metamorphic history with various isotope systematics. Here, we report the U-Pb intercept age of 4466 Ā± 29 Ma and the weighted-average 207Pb-206Pb age of 4460 Ā± 30 Ma for the Cl-apatite grains from GRA 06129. Our apatite ages are obviously younger than that of the 26Al-26Mg model age (4565.9 Ā± 0.3 Ma; Shearer et al. 2010a), but are the same as the 40Ar-39Ar age obtained via step-heating of the bulk rock (4460 Ā± 28 Ma; Fernandes and Shearer 2010; Shearer et al. 2010a). Based on petrographic observations, merrillites are usually rimmed by apatite and exist as inclusions in apatite. Therefore, the apatite U-Pb age from GRA 06129 probably records a metamorphic event of replacing merrillite with apatite, caused by Cl-rich melts or fluids on their parent body. A collisional event has provided the impact heating for this metamorphic event. Increasing amounts of geochronologic evidence show that the giant impact of the Moon-forming event has affected the asteroid belt at 4450ā4470 Ma (Bogard and Garrison 2009; Popova et al. 2013; Yin et al. 2014; Zhang et al. 2016). Considering the contemporary metamorphic events for GRA 06129 (4460 Ā± 30 Ma), it is likely that the asteroid parent body of GRA 06129 was also affected by the same giant impact as the Moon-forming event. |
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