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Geology; April 1998; v. 26; no. 4; p. 371-374; DOI: 10.1130/0091-7613(1998)026<0371:PMITQO>2.3.CO;2
© 1998 Geological Society of America
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Paleozoic metamorphism in the Qinling orogen, Tongbai Mountains, central China

Xiaoming Zhai1, Howard W. Day1, Bradley R. Hacker2 and Zhendong You3

1 Department of Geology, University of California, Davis, California 95616
2 Department of Geological Sciences, University of California, Santa Barbara, California 93106
3 Department of Geology, China University of Geosciences, Wuhan 430074, People's Republic of China

The collision of the Sino-Korean and Yangtze blocks to form a significant part of China is recorded in the Qinling, Tongbai, and Dabie Mountains. Radiometric ages of the ultrahigh-pressure metamorphic rocks in the South Qinling orogenic belt suggest that subduction and collision took place during the Triassic Period. Our new 40Ar/39Ar geochronology of units in the North Qinling orogenic belt confirms that high-grade metamorphism and deformation took place also during the Silurian-Devonian and Carboniferous Periods. These results imply that the amalgamation of eastern China was a multistage process extending over at least 200 m.y.




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