The Western Ailaoshan Volcanic Belts and their SE Asia connection

a new tectonic model for the Eastern Indochina Block

Chun-Kit Lai, Sebastien Meffre, Anthony J. Crawford, Khin Zaw, Chuan-Dong Xue, Jacqueline A. Halpin

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

The Western Ailaoshan (WAL) Volcanic Belts mark the western boundary of the South China-Indochina Suture Zone along the Ailaoshan Fold Belt. Geochronological and geochemical evidence suggests that the WAL Volcanic Belts vary in ages and origins, and includes (1) L. Carboniferous-earliest M.-Permian (ca. 300-270. Ma) incipient backarc basin magmatism; (2) M. Permian (ca. 265. Ma) island arc/mature backarc basin magmatism; (3) early L. Permian (ca. 260-255. Ma) WAL-Indochina arc-continent collision and the associated syn-collisional granitic magmatism, as well as subsequent (4) E. Triassic (ca. 250-245. Ma) post-collisional magmatism. Regional geological comparison indicates that the post-L. Carboniferous WAL tectonic evolution was closely related to the Eastern Indochina Block. We present a new G-Plate geodynamic evolution model for the Ailaoshan Fold Belt and its surrounding South China-Indochina region, based on new and published U-Pb zircon ages, together with whole rock and Pb-isotope geochemical data.

Original languageEnglish
Pages (from-to)52-74
Number of pages23
JournalGondwana Research
Volume26
Issue number1
DOIs
Publication statusPublished - Jul 2014
Externally publishedYes

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Keywords

  • Western Ailaoshan (WAL) Volcanic Belts
  • SE Asia
  • Arc/backarc basin
  • Arc–continent collision
  • G-Plate tectonic reconstruction

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