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DOI | 10.1038/s41561-018-0206-5 |
An impact melt origin for Earth's oldest known evolved rocks | |
Johnson, Tim E.1,2; Gardiner, Nicholas J.1; Miljkovic, Katarina1; Spencer, Christopher J.1; Kirkland, Christopher L.1; Bland, Phil A.1; Smithies, Hugh3 | |
2018-10-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:10页码:795-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; Peoples R China |
英文摘要 | Earth's oldest evolved (felsic) rocks, the 4.02-billion-year-old Idiwhaa gneisses of the Acasta Gneiss Complex, northwest Canada, have compositions that are distinct from the felsic rocks that typify Earth's ancient continental nuclei, implying that they formed through a different process. Using phase equilibria and trace element modelling, we show that the Idiwhaa gneisses were produced by partial melting of iron-rich hydrated basaltic rocks (amphibolites) at very low pressures, equating to the uppermost similar to 3 km of a Hadean crust that was dominantly mafic in composition. The heat required for partial melting at such shallow levels is most easily explained through meteorite impacts. Hydrodynamic impact modelling shows not only that this scenario is physically plausible, but also that the region of shallow partial melting appropriate to formation of the Idiwhaa gneisses would have been widespread. Given the predicted high flux of meteorites in the late Hadean, impact melting may have been the predominant mechanism that generated Hadean felsic rocks. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000446089100020 |
WOS关键词 | ACASTA GNEISS COMPLEX ; MINERAL EQUILIBRIA CALCULATIONS ; CONTINENTAL-CRUST ; NORTHWESTERN CANADA ; SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 ; METAPELITIC GRANULITES ; HADEAN CRUST ; ICELAND ; ZIRCONS ; GA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/34837 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Curtin Univ, Sch Earth & Planetary Sci, Inst Geosci Res TIGeR, Perth, WA, Australia; 2.China Univ Geosci, Ctr Global Tecton, State Key Lab Geol Proc & Mineral Resources, Wuhan, Hubei, Peoples R China; 3.Dept Mines Ind Regulat & Safety, Geosci Directorate, East Perth, WA, Australia |
推荐引用方式 GB/T 7714 | Johnson, Tim E.,Gardiner, Nicholas J.,Miljkovic, Katarina,et al. An impact melt origin for Earth's oldest known evolved rocks[J]. NATURE GEOSCIENCE,2018,11(10):795-+. |
APA | Johnson, Tim E..,Gardiner, Nicholas J..,Miljkovic, Katarina.,Spencer, Christopher J..,Kirkland, Christopher L..,...&Smithies, Hugh.(2018).An impact melt origin for Earth's oldest known evolved rocks.NATURE GEOSCIENCE,11(10),795-+. |
MLA | Johnson, Tim E.,et al."An impact melt origin for Earth's oldest known evolved rocks".NATURE GEOSCIENCE 11.10(2018):795-+. |
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