| DOI: | 10.1038/s41561-021-00764-7
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| 论文题名: | Rapid recycling of subducted sedimentary carbon revealed by Afghanistan carbonatite volcano |
| 作者: | Horton F.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2021
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| 卷: | 14, 期:7 | | 起始页码: | 508
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| 结束页码: | 512
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| 语种: | 英语
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| 英文摘要: | The fate of carbon subducted to mantle depths remains uncertain, yet strongly influences the distribution of terrestrial carbon on geologic timescales. Carbon fluxes into subduction zones are exceptionally high where downgoing plates contain thick sedimentary fans. This study uses volcano geochemistry to assess sedimentary carbon recycling in the high-flux Makran subduction zone, where the Arabian plate subducts northward beneath Eurasia. On the basis of strontium isotope geochemistry and 40Ar–39Ar geochronology, I show that a portion of the submarine Indus Fan entered the Makran Trench, melted and ascended as magmas that erupted in southern Afghanistan. The resulting volcano, composed primarily of carbonate minerals, formed at approximately 3.8 million years ago. The 87Sr/86Sr ratios of the lavas indicate that their magmatic precursors were derived from marine sediments deposited at 28.9 ± 1.4 Ma. This implies that sedimentary carbon was subducted to and returned from mantle depths in less than 27 million years, indicating that magmas can efficiently recycle sedimentary carbon from subducting slabs to the overlying plate. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/169762
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| Appears in Collections: | 气候变化与战略
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作者单位: | Woods Hole Oceanographic Institution, Woods Hole, MA, United States
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| Recommended Citation: | |
Horton F.. Rapid recycling of subducted sedimentary carbon revealed by Afghanistan carbonatite volcano[J]. Nature Geoscience,2021-01-01,14(7)
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