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Science 8 November 2002:
Vol. 298. no. 5596, pp. 1219 - 1221
DOI: 10.1126/science.1078115
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Reports
Seismic Images of Crust and Upper Mantle Beneath Tibet: Evidence for Eurasian Plate Subduction
R. Kind,12*
X. Yuan,1
J. Saul,1
D. Nelson,3
S. V. Sobolev,14
J. Mechie,1
W. Zhao,5
G. Kosarev,4
J. Ni,6
U. Achauer,7
M. Jiang5
Seismic data from central Tibet have been combined to image
the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the
plateau. The discontinuities appear slightly deeper beneath northern
Tibet, implying that the average temperature of the mantle above the
transition zone is about 300°C hotter in the north than in the south.
There is a prominent south-dipping converter in the uppermost mantle
beneath northern Tibet that might represent the top of the Eurasian
mantle lithosphere underthrusting the northern margin of the plateau.
1 GeoForschungsZentrum Potsdam,
Telegrafenberg, 14473 Potsdam, Germany.
2 Freie
Universität Berlin, 12249 Berlin, Germany.
3 Department of Earth Sciences, Syracuse University,
Syracuse, NY 13244, USA.
4 Institute of the Physics
of the Earth, Russian Academy of Sciences, B. Gruzinskaya 10, 128810 Moscow, Russia.
5 Chinese Academy of Geological
Sciences, 26 Baiwanzhang Road, Beijing 100037, China.
6 Department of Physics, New Mexico State
University, Las Cruces, NM 88003, USA.
7 École
et Observatoire des Sciences de la Terre, Universite Louis Pasteur, 5 rue René Descartes, F-67084 Strasbourg Cedex, France.
*
To whom correspondence should be addressed. E-mail:
kind{at}gfz-potsdam.de
Deceased (18 August 2002).
Read the Full Text
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