globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0573-6
论文题名:
Critical role of water in the formation of continental crust
作者: Collins W.J.; Murphy J.B.; Johnson T.E.; Huang H.-Q.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:5
起始页码: 331
结束页码: 338
语种: 英语
英文关键词: continental arc ; continental crust ; fractionation ; granitoid ; low temperature ; melting ; slab ; slurry ; subduction ; underplating
英文摘要: Continental arcs are the sites of production of continental crust, but the origin of these magmatic systems is not well understood. Although a number of processes have been suggested to be important, the role of water migrating from slab to surface during subduction has been underappreciated. Directly below the Moho, hot (approximately 1,100 °C), hydrous basaltic magmas fractionate as they cool to the regional geotherm at 750 to 800 °C, ultimately solidifying as mafic underplates. Cooling and fractionation cause water to exsolve and ascend, triggering fluid-fluxed melting of overlying mafic underplates and other crust. Melting of prior mafic underplates buffers temperatures and generates the voluminous, juvenile low-K magmas of Cordilleran batholiths. These granitoid magmas comprise a low-temperature slurry of melt and residue, and recrystallize into silicic mush during adiabatic ascent. Such hydrous mushes are intermittently infused by hotter, more mafic magmas, which hybridize and facilitate ascent and, potentially, eruption. Fluid-fluxed melting overcomes many of the general petrological and geochemical problems associated with models dominated by fractional crystallization. The role of water during repeated episodes of mafic underplating is critical to generate the juvenile granitoid infrastructure of the continents. © 2020, Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169575
Appears in Collections:气候变化与战略

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作者单位: Earth Dynamics Research Group, The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA, Australia; Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS, Canada; Centre for Global Tectonics, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Economic Geology Research Centre, College of Science and Engineering, Division of Tropical Environments and Societies, James Cook University, Townsville, QLD, Australia

Recommended Citation:
Collins W.J.,Murphy J.B.,Johnson T.E.,et al. Critical role of water in the formation of continental crust[J]. Nature Geoscience,2020-01-01,13(5)
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