Triassic continental subduction in central tibet and Mediterranean-style closure of the Paleo-Tethys Ocean

Alex Pullen, Paul Kapp, George E. Gehrels, Jeff D. Vervoort, Lin Ding

Research output: Contribution to journalArticle

353 Scopus citations

Abstract

The Qiangtang metamorphic belt (QMB) in central Tibet is one of the largest and most recently documented high-pressure (HP) to near-ultrahigh-pressure (near-UHP) belts on Earth. Lu-Hf ages of eclogite- and blueschist-facies rocks within the QNB an 244-223 Ma, indistinguishable from the age of UHP metamorphism in the Qinling-Dabie orogen. Results of a U-Pb detrital zircon study suggest that protoliths of the QMB include upper Paleozoic Qiangtang continental margin strata and sandstones that were derived from a Paleozoic arc terrane that developed within the Paleo-Tethys Ocean to the north. We attribute QMB HP metamorphism to continental collision between the Qiangtang terrane and a Paleo-Tethys arc terrane. This collision, and the coeval South China-North China collision, may have slowed convergence between Laurasia and Gondwana-derived terranes and initiated Mediterranean-style rollback and backarc basin development within much of the remnant Paleo-Tethys Ocean realm.

Original languageEnglish (US)
Pages (from-to)351-354
Number of pages4
JournalGeology
Volume36
Issue number5
DOIs
StatePublished - May 1 2008

Keywords

  • Continental subduction
  • Eclogite
  • Paleo-tethys
  • Qiangtang
  • Rollback
  • Tibet

ASJC Scopus subject areas

  • Geology

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