Reactivation of an Archean craton: Constraints from P- and S-wave tomography in North China

Details Reactivation of an Archean craton: Constraints from P- and S-wave tomography in North China Reactivation of an Archean craton: Constraints from P- and S-wave tomography in North China

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3617306z&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 17, CiteID L17306

Physics

9

Seismology: Tomography (6982, 8180), Seismology: Core (1212, 1213, 8124), Seismology: Body Waves

Scientific paper

The unusual reactivation of the North China Craton (NCC) challenges the classical views concerning the strength and stability of cratonic lithosphere. By using teleseismic body-waves recorded at 250 seismic stations, this paper presents high-resolution North China Models of P- and S-wave velocity based on finite-frequency kernel tomography. Both P- and S-wave velocity models reveal that: (1) an obvious N-S trending narrow low-velocity region is located at the base of the lithosphere beneath the Central Block (CB) of the NCC, which extends to more than 500 km depth; (2) a region of high-velocity extends to more than 250-300 km depth beneath the Western Block, in contrast to the much shallower high-velocity zones beneath the CB and shallower high-velocities beneath the Eastern Block. These features suggest that warm mantle material with a source at least as deep as the transition zone, possibly a mantle plume, may be responsible for the reactivation of the NCC. The Central Block may have behaved as a sublithospheric corridor for the warm mantle material due to its pre-existing weakness.

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