Metamorphism and tectonic evolution of the Lancang paired metamorphic belts, south-western China

Zhang Ruyuan Zhang, Cong Bolin Cong, S. Maruyama, J. G. Liou

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Abstract

The Lancang metamorphic terrane consists of an eastern low-P/T belt and a western high-P/T belt divided by a N-S-trending fault. Protoliths of both units are mid-late Proterozoic basement and its cover. The paired metamorphic belts combined with the spatial and temporal distribution of other blueschist belts lead the authors to propose a tentative tectonic history of south-east Asia since the latest Precambrian. Tectonic juxtaposition of paired belts with contrasting P-T conditions, perhaps during collision of the Baoshan block with south-east Asia, suggests that an intervening oceanic zone existed that has been removed. The Boashan block is a microcontinent rifted from the northern periphery of Gondwana. Successive collision and amalgamation of microcontinents from either Gondwana or the Panthalassan ocean resulted in rapid southward continental growth of c.500 km during the last 200 Ma. Hence, the Lancang region in south-east Asia represents a suture zone between two contrasting microcontinents. -from Authors

Original languageEnglish
Pages (from-to)605-619
Number of pages15
JournalJournal of Metamorphic Geology
Volume11
Issue number4
Publication statusPublished - 1993
Externally publishedYes

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ASJC Scopus subject areas

  • Geology

Cite this

Ruyuan Zhang, Z., Bolin Cong, C., Maruyama, S., & Liou, J. G. (1993). Metamorphism and tectonic evolution of the Lancang paired metamorphic belts, south-western China. Journal of Metamorphic Geology, 11(4), 605-619.