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DOI | 10.1073/pnas.2016326117 |
The internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record | |
Maria M. Costa; Ninna K. Jensen; Laura C. Bouvier; James N. Connelly; Takashi Mikouchi; Matthew S. A. Horstwood; Jussi-Petteri Suuronen; Frédéric Moynier; Zhengbin Deng; Arnaud Agranier; Laure A. J. Martin; Tim E. Johnson; Alexander A. Nemchin; Martin Bizzarro | |
2020-11-16 | |
发表期刊 | Proceedings of the National Academy of Science
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出版年 | 2020 |
英文摘要 | Combining U–Pb ages with Lu–Hf data in zircon provides insights into the magmatic history of rocky planets. The Northwest Africa (NWA) 7034/7533 meteorites are samples of the southern highlands of Mars containing zircon with ages as old as 4476.3 ± 0.9 Ma, interpreted to reflect reworking of the primordial Martian crust by impacts. We extracted a statistically significant zircon population (n = 57) from NWA 7533 that defines a temporal record spanning 4.2 Gyr. Ancient zircons record ages from 4485.5 ± 2.2 Ma to 4331.0 ± 1.4 Ma, defining a bimodal distribution with groupings at 4474 ± 10 Ma and 4442 ± 17 Ma. We interpret these to represent intense bombardment episodes at the planet’s surface, possibly triggered by the early migration of gas giant planets. The unradiogenic initial Hf-isotope composition of these zircons establishes that Mars’s igneous activity prior to ∼4.3 Ga was limited to impact-related reworking of a chemically enriched, primordial crust. A group of younger detrital zircons record ages from 1548.0 ± 8.8 Ma to 299.5 ± 0.6 Ma. The only plausible sources for these grains are the temporally associated Elysium and Tharsis volcanic provinces that are the expressions of deep-seated mantle plumes. The chondritic-like Hf-isotope compositions of these zircons require the existence of a primitive and convecting mantle reservoir, indicating that Mars has been in a stagnant-lid tectonic regime for most of its history. Our results imply that zircon is ubiquitous on the Martian surface, providing a faithful record of the planet’s magmatic history. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/304346 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Maria M. Costa,Ninna K. Jensen,Laura C. Bouvier,et al. The internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record[J]. Proceedings of the National Academy of Science,2020. |
APA | Maria M. Costa.,Ninna K. Jensen.,Laura C. Bouvier.,James N. Connelly.,Takashi Mikouchi.,...&Martin Bizzarro.(2020).The internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record.Proceedings of the National Academy of Science. |
MLA | Maria M. Costa,et al."The internal structure and geodynamics of Mars inferred from a 4.2-Gyr zircon record".Proceedings of the National Academy of Science (2020). |
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