Structure and evolution of the Himalaya–Tibet orogenic belt

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Abstract

The 1981 French–Chinese expedition to Tibet focused on the Lhasa block, extending earlier coverage 400 km north of the Tsangpo suture. The Lhasa block stood between 10 and 15° N latitude over most of the Upper Cretaceous and Eocene and, if Gondwanian in origin, had detached from Gondwana by early Permian. Seismic profiles reveal a complex Moho topography resulting both from multiple continental thrusting and large-scale strike-slip faulting. Subduction related granitoids representing mixtures of mantle and crustal components and anatectic granitoids have been analysed and dated. This study emphasizes the role of smaller blocks in the accretion of the continental mosaic.

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Allégre, C., Courtillot, V., Tapponnier, P. et al. Structure and evolution of the Himalaya–Tibet orogenic belt. Nature 307, 17–22 (1984) doi:10.1038/307017a0

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