气候变化领域集成服务门户(CCPortal): A 60-Myr record of continental back-arc differentiation through cyclic melting

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DOI	10.1038/s41561-019-0298-6
	A 60-Myr record of continental back-arc differentiation through cyclic melting
	Wolfram L.C.; Weinberg R.F.; Nebel O.; Hamza K.; Hasalová P.; Míková J.; Becchio R.
发表日期	2019
ISSN	17520894
卷号	12 期号:3
英文摘要	Continental crust forms and evolves above subduction zones as a result of heat and mass transfer from the mantle below. The nature and extent of this transfer remain debated. Although it has been recognized that arc magmatism at active continental margins can be cyclical at 50- to 1-Myr timescales, such cyclicity has not been recognized in the back-arc. Here we investigate the melting of sedimentary rocks in the continental back-arc of the western Gondwana margin during the Cambrian–Ordovician Famatinian orogeny of Northwest Argentina. We determine the U−Pb ages of zircons that formed during crustal melting and find that they range from 505 to 440 million years ago, concentrated into age groups spaced by 10–15 Myr. This suggests multiple and cyclical melting events in the continental back-arc, which matches the more than 60 Myr duration of the magmatic activity in the arc and demonstrates that thermal and magmatic cyclicity also extends to the continental hinterland. We conclude that back-arc melting reflects a long-lasting, pulsating, cyclical heat transfer from mantle to crust that leads to thorough crustal reworking, transforming sedimentary rocks into crystalline continental crust. Thus, while magma transfer from the mantle promotes crustal growth in convergent margins, cyclical melting promotes crustal maturation of the back-arc. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	active margin; arc-arc collision; continental crust; continental margin; convergent margin; heat transfer; magmatism; mantle; mass transfer; melting; sedimentary rock; subduction zone; uranium-lead dating; Argentina
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/124708
作者单位	School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; School of Mathematical Sciences, Monash University, Clayton, VIC, Australia; Centre for Lithospheric Research, Czech Geological Survey, Prague, Czech Republic; Instituto Geonorte, National University of Salta, Salta, Argentina; LaTe Andes, Salta, Argentina
推荐引用方式 GB/T 7714	Wolfram L.C.,Weinberg R.F.,Nebel O.,et al. A 60-Myr record of continental back-arc differentiation through cyclic melting[J],2019,12(3).
APA	Wolfram L.C..,Weinberg R.F..,Nebel O..,Hamza K..,Hasalová P..,...&Becchio R..(2019).A 60-Myr record of continental back-arc differentiation through cyclic melting.Nature Geoscience,12(3).
MLA	Wolfram L.C.,et al."A 60-Myr record of continental back-arc differentiation through cyclic melting".Nature Geoscience 12.3(2019).