Detrital zircon provenance of the Late Triassic Songpan-Ganzi complex: Sedimentary record of collision of the North and South China blocks
- Amy L. Weislogel1,
- Stephan A. Graham1,
- Edmund Z. Chang1,
- Joeseph L. Wooden2,
- George E. Gehrels3 and
- Hengshu Yang4
- 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA
- 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA
- 3Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA
- 4Sichuan Bureau of Geology and Ore Examination, Mianyang, Sichuan 621000, People's Republic of China
Abstract
Using detrital zircon geochronology, turbidite deposystems fed from distinct sediment sources can be distinguished within the Songpan-Ganzi complex, a collapsed Middle to Late Triassic turbidite basin of central China. A southern Songpan-Ganzi deposystem initially was sourced solely by erosion of the Qinling-Dabie orogen during early Late Triassic time, then by Qinling-Dabie orogen, North China block, and South China block sources during middle to late Late Triassic time. A northern Songpan-Ganzi system was sourced by erosion of the Qinling-Dabie orogen and the North China block throughout its deposition. These separate deposystems were later tectonically amalgamated to form one complex and then uplifted as the eastern Tibet Plateau.
Footnotes
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↵GSA Data Repository item 2006023, zircon analytical results, is available online at http://www.geosociety.org/pubs/ft2006.htm, or on request from editing{at}geosociety.org or Documents Secretary, GSA, P.O. Box 9140, Boulder, CO 80301-9140, USA.
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- Accepted 12 October 2005.
- Received 8 June 2005.
- Revision received 7 October 2005.
- Geological Society of America
