The thermochemical structure of the lithosphere and upper mantle beneath South China

Results from multiobservable probabilistic inversion

B. Shan*, J. C. Afonso, Y. Yang, C. J. Grose, Y. Zheng, X. Xiong, L. Zhou

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We study the thermal and compositional structure of south China by jointly inverting Rayleigh wave dispersion data, geoid height, topography, and surface heat flow with a probabilistic (Bayesian) Monte Carlo method. We find that the lithosphere is thin (85-150 km) beneath the South China Fold system and thickens over the Yangtze Craton to maximum thicknesses of up to 250 km beneath the Sichuan Basin. Our inversion predicts that the lithospheric mantle beneath the South China Fold system and Yangtze Craton is highly fertile (Mg# ~88-90), in agreement with independent geochemical signatures from East China mantle xenoliths. Such fertile compositions, together with the relatively thin lithospheric thickness in the area, point toward a widespread metasomatism/refertilization event. We suggest, as others have, that a flat-subduction episode and subsequent slab removal may have triggered both the delamination of the lowermost part of the subcontinental lithosphere and the generation of asthenospheric melts that metasomatized (refertilized) the remaining lithospheric mantle. Inconsistencies among geophysical observations and anomalously fertile compositions for the Sichuan Basin indicate that this region may be currently affected by small-scale convection or delamination processes. Alternatively, the anomalous observations may be associated with an eastward push of Tibetan lithosphere beneath the Yangtze Craton.

Original languageEnglish
Pages (from-to)8417-8441
Number of pages25
JournalJournal of Geophysical Research: Solid Earth
Volume119
Issue number11
DOIs
Publication statusPublished - 2014

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