Eclogitic Metasediments from Central Qiangtang, Northern Tibet: Evidence for Continental Subduction During the Eastern and Western Qiangtang Collision

Authors

  • Xian-Chun Tang
     Research Institute of Petroleum Exploration and Development, East China Branch Company, SINOPEC, Nanjing-210 010
  • Yu-Xiu Zhang
     Guangzhou Institute of Geochemistry, Key Laboratory of Geology of Marginal Sea, Chinese Academy of Sciences, Wushan, Guangzhou-510 640

Keywords:

Eclogite, UHP Metamorphism, Shuanghu Suture, Qiangtang, Tibet.

Abstract

Eclogitic metasediments from the central Qiangtang metamorphic terrane provide new insights into the continental subduction during the eastern and western Qiangtang collision. Petrologic observations show that the metasediments correspond to meta-sandstones of a continental margin. It is characterized by the garnet + omphacite + rutile + phengite + quartz assemblage, and the peak metamorphic temperature and pressure were estimated to be 535 ± 40 °C and ∼27 kbar, respectively, by major element partitioning thermobarometry. Subsequent retrogression occurred at ∼472 ± 30 °C and ∼6-9 kbar. The occurrence of eclogitized central Qiangtang terrane indicates the subduction of the western Qiangtang passive continental margin beneath eastern Qiangtang when eastern and western Qiangtang collided along the Shuanghu suture.

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Issue

Volume 80, Issue 6, December 2012

Section

Research Articles

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Published

2012-12-01

How to Cite

Tang, X.-C., & Zhang, Y.-X. (2012). Eclogitic Metasediments from Central Qiangtang, Northern Tibet: Evidence for Continental Subduction During the Eastern and Western Qiangtang Collision. Journal of Geological Society of India, 80(6), 836–844. Retrieved from http://www.geosocindia.com/index.php/jgsi/article/view/58106

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