气候变化领域集成服务门户(CCPortal): Critical role of water in the formation of continental crust

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DOI	10.1038/s41561-020-0573-6
	Critical role of water in the formation of continental crust
	Collins W.J.; Murphy J.B.; Johnson T.E.; Huang H.-Q.
发表日期	2020
ISSN	17520894
起始页码	331
结束页码	338
卷号	13 期号:5
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.
英文关键词	continental arc; continental crust; fractionation; granitoid; low temperature; melting; slab; slurry; subduction; underplating
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206760
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
推荐引用方式 GB/T 7714	Collins W.J.,Murphy J.B.,Johnson T.E.,et al. Critical role of water in the formation of continental crust[J],2020,13(5).
APA	Collins W.J.,Murphy J.B.,Johnson T.E.,&Huang H.-Q..(2020).Critical role of water in the formation of continental crust.Nature Geoscience,13(5).
MLA	Collins W.J.,et al."Critical role of water in the formation of continental crust".Nature Geoscience 13.5(2020).