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Receiver function imaging of the mantle transition zone beneath the South China Block

Huang, H. and Tosi, Nicola and Chang, S.-J. and Xia, S. and Qiu, X. (2015) Receiver function imaging of the mantle transition zone beneath the South China Block. Geochemistry Geophysics Geosystems, 16 (10), pp. 3666-3678. Wiley. doi: 10.1002/2015GC005978. ISSN 1525-2027.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2015GC005978/full


Upper mantle discontinuities are influenced by convection-related thermal heterogeneities arising in complex geodynamic settings. Slab rollback of the Pacific plate and mantle upwelling in the Meso-Cenozoic caused the extension and spreading of continental segments in the South China Block leading to profound variations of the local temperature conditions. We processed 201 teleseismic events beneath 87 stations in the Hainan, Guangdong, and Fujian provinces in the South China Block, and extracted 4172 high-quality receiver functions. We imaged the topography of the local mantle discontinuities by using phase-weighted common conversion point stacking of the receiver functions, which effectively improves the P-to-S-converted phases. We found that the average depths of the discontinuities at 410 and 660 km depth are 414 and 657 km, respectively, while no clearly defined discontinuity at 520 km depth was detected. We mapped the thickness of the mantle transition zone (MTZ), which can reflect temperature and/or compositional heterogeneities as well as the presence of water, and discussed possible geodynamic implications. In particular, we found that the MTZ beneath the Leizhou Peninsula in the Hainan province is 42 km thinner than average. This scenario suggests that the Hainan plume is responsible for positive temperature anomalies between ∼270 and 380 K and between ∼200 and 240 K at the 660 and 410 km discontinuities, respectively. We also observed a prominent uplifting of the 660 km boundary beneath the coast regions that may be indicative of lateral flow of the Hainan plume.

Item URL in elib:https://elib.dlr.de/101660/
Document Type:Article
Title:Receiver function imaging of the mantle transition zone beneath the South China Block
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Tosi, NicolaUNSPECIFIEDhttps://orcid.org/0000-0002-4912-2848UNSPECIFIED
Date:27 October 2015
Journal or Publication Title:Geochemistry Geophysics Geosystems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 3666-3678
EditorsEmailEditor's ORCID iDORCID Put Code
Becker, ThorstenUniversity of Southern California Department of Earth Sciences Los Angeles, CA 90089-0740UNSPECIFIEDUNSPECIFIED
Keywords:mantle transition zone, South China Block
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Deposited By: Rückriemen, Tina
Deposited On:07 Jan 2016 09:42
Last Modified:28 Mar 2023 23:45

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