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Simultaneous and extensive removal of the East Asian lithospheric root.

journal contribution
posted on 22.05.2020 by Thomas C Sheldrick, Tiffany L Barry, Batulzii Dash, Chengshi Gan, Ian L Millar, Dan N Barfod, Alison M Halton
Much evidence points to a dramatic thinning of East Asian lithosphere during the Mesozoic, but with little precision on when, or over what time scale. Using geochemical constraints, we examine an extensive compilation of dated volcanic samples from Russia, Mongolia and North China to determine when the lithosphere thinned and how long that process took. Geochemical results suggest that magmatism before 107 Ma derived from metasomatised subcontinental lithospheric mantle (SCLM), whereas after 107 Ma, melt predominantly derived from an asthenospheric source. The switch to an asthenospheric magma source at ~107 Ma occurred in both Mongolia and North China (>1600 km apart), whereas in eastern Russia the switch occurred a little later (~85 Ma). Such a dramatic change to an asthenospheric contribution appears to have taken, from beginning to end, just ~30 Myrs, suggesting this is the duration for lithospheric mantle weakening and removal. Subsequent volcanism, through the Cenozoic in Mongolia and North China does not appear to include any contribution from the removed SCLM, despite melts predominantly deriving from the asthenosphere.

Funding

The AIF and isotope analyses were supported by NERC grant NIGFSC 1610-0516. Thanks to Mungunshagai for field guidance.

History

Citation

Sheldrick, T.C., Barry, T.L., Dash, B. et al. Simultaneous and extensive removal of the East Asian lithospheric root. Sci Rep 10, 4128 (2020). https://doi.org/10.1038/s41598-020-60925-3

Version

VoR (Version of Record)

Published in

Sci Rep

Volume

10

Issue

1

Pagination

4128

Publisher

Springer Science and Business Media LLC

eissn

2045-2322

Acceptance date

19/02/2020

Copyright date

2020

Spatial coverage

East Asia

Language

eng

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