globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2942
论文题名:
Formation of Hadean granites by melting of igneous crust
作者: Burnham A.D.; Berry A.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:6
起始页码: 457
结束页码: 461
语种: 英语
Scopus关键词: concentration (composition) ; crystallization ; granite ; Hadean ; igneous geochemistry ; igneous rock ; magmatism ; melting ; phosphorus ; rare earth element ; trace element ; zircon ; Australia ; Jack Hills ; Western Australia
英文摘要: The oldest known samples of Earth, with ages of up to 4.4 Gyr, are detrital zircon grains in meta-sedimentary rocks of the Jack Hills in Australia. These zircons offer insights into the magmas from which they crystallized, and, by implication, igneous activity and tectonics in the first 500 million years of Earth's history, the Hadean eon. However, the compositions of these magmas and the relative contributions of igneous and sedimentary components to their sources have not yet been resolved. Here we compare the trace element concentrations of the Jack Hills zircons to those of zircons from the locality where igneous (I-) and sedimentary (S-) type granites were first distinguished. We show that the Hadean zircons crystallized predominantly from I-type magmas formed by melting of a reduced, garnet-bearing igneous crust. Further, we propose that both the phosphorus content of zircon and the ratio of phosphorus to rare earth elements can be used to distinguish between detrital zircon grains from I-A nd S-type sources. These elemental discriminants provide a new geochemical tool to assess the relative contributions of primeval magmatism and melting of recycled sediments to the continents over geological time. © 2017 Macmillan Publishers Limited, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105777
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia

Recommended Citation:
Burnham A.D.,Berry A.J.. Formation of Hadean granites by melting of igneous crust[J]. Nature Geoscience,2017-01-01,10(6)
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