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Discussion: 'Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust-mantle mixing and metamorphism in the deep crust' by Wang et al. 2016 (Contributions to Mineralogy and Petrology) 171:62

Stepanov, AS ORCID: 0000-0001-6672-5125, Campbell, IH, Rapp, RP, Lowczak, J and Korsakov, AV 2017 , 'Discussion: 'Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust-mantle mixing and metamorphism in the deep crust' by Wang et al. 2016 (Contributions to Mineralogy and Petrology) 171:62' , Contributions to Mineralogy and Petrology, vol. 172 , pp. 1-4 , doi: 10.1007/s00410-017-1332-6.

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Abstract

Wang et  al. (Contrib Mineral Petrol 171:62, 2016a) present data on composition of xenolith from Southern Tibet and conclude that ulrapotassic melts from the region formed by melting mantle, and complex interaction with a crustal component. In this discussion we demonstrate that numerous observations presented by Wang et al. (2016a) can be explained by partial melting of crust followed by interaction between that melt and the mantle. We show that this model can explain the variability of magmas in such suits without evoking occurrence of coincidental, unrelated events. Moreover we demonstrate that our model of a crustal origin of the proto-shoshonite melts is now supported by independent lines of evidence such as geochemistry of restites after high- and ultrahigh- pressure melting and melt inclusion studies.

Item Type: Article
Authors/Creators:Stepanov, AS and Campbell, IH and Rapp, RP and Lowczak, J and Korsakov, AV
Keywords: shoshonite, magmatism, ultrapotassic magmas, shoshonite, xenolith, crust–mantle interaction
Journal or Publication Title: Contributions to Mineralogy and Petrology
Publisher: Springer-Verlag
ISSN: 0010-7999
DOI / ID Number: 10.1007/s00410-017-1332-6
Copyright Information:

Copyright 2017 Springer-Verlag Berlin Heidelberg

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