Scopus记录号: 2-s2.0-85061210122
论文题名: A 60-Myr record of continental back-arc differentiation through cyclic melting
作者: Wolfram L.C. ; Weinberg R.F. ; Nebel O. ; Hamza K. ; Hasalová P. ; Míková J. ; Becchio R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
语种: 英语
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. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122630
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
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
Recommended Citation:
Wolfram L.C.,Weinberg R.F.,Nebel O.,et al. A 60-Myr record of continental back-arc differentiation through cyclic melting[J]. Nature Geoscience,2019-01-01