The timescale of accretion and core formation of the Earth inferred from Hf-W isotope systematics
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- NAGAHARA Hiroko
- Department of Earth and Planetary Science, The University of Tokyo
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- OZAWA Kazuhito
- Department of Earth and Planetary Science, The University of Tokyo
書誌事項
- タイトル別名
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- timescale of accretion and core formation of the Earth inferred from Hf Wisotope systematics
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The Hf-W chromometer that was developed recently is a very powerful tool because of high time resolution due to short half life and significant partitioning of Hf into the mantle and W into the core. We have developed a mass conservation equation, which includes three important parameters, mass accretion rate, metal separation rate, and redox reaction rate, and searched for the conditions to satisfy the Hf/W and W isotopic compositions of the present Earth's mantle. Although previous work has suggested slow accretion (accretion time >50Myr), it could be shorter by an order of magnitude if the metal separation time or redox reaction rate is longer than -100Myr. The slow metal separation rate with rapid accretion is, however, inconsistent with constraints from thermal evolution and fluid dynamics, and slow redox reaction of oxidized materials is the plausible mechanism.
収録刊行物
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- Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences
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Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences 77 (9), 167-171, 2001
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詳細情報 詳細情報について
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- CRID
- 1390001204146156800
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- NII論文ID
- 130000907874
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- NII書誌ID
- AA00785485
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- ISSN
- 13492896
- 03862208
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- NDL書誌ID
- 6048563
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- CiNii Articles
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- 使用不可