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The thermochemical structure of the lithosphere and upper mantle beneath south China: Results from multiobservable probabilistic inversion
Author(s) -
Shan B.,
Afonso J. C.,
Yang Y.,
Grose C. J.,
Zheng Y.,
Xiong X.,
Zhou L.
Publication year - 2014
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2014jb011412
Subject(s) - lithosphere , craton , geology , subduction , mantle (geology) , geophysics , petrology , seismology , tectonics
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.