Deep structure and origin of active volcanoes in China

Dapeng Zhao, Lucy Liu

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

We synthesize significant recent results on the deep structure and origin of the active volcanoes in mainland China. Magmatism in the western Pacific arc and back-arc areas is caused by dehydration of the subducting slab and by corner flow in the mantle wedge, whereas the intraplate magmatism in China has different origins. The active volcanoes in Northeast China (such as the Changbai and Wudalianchi) are caused by hot upwelling in the big mantle wedge (BMW) above the stagnant slab in the mantle transition zone and deep slab dehydration as well. The Tengchong volcano in Southwest China is caused by a similar process in the BMW above the subducting Burma microplate (or Indian plate). The Hainan volcano in southernmost China is a hotspot fed by a lower-mantle plume which may be associated with the Pacific and Philippine Sea slabs' deep subduction in the east and the Indian slab's deep subduction in the west down to the lower mantle. The stagnant slab finally collapses down to the bottom of the mantle, which can trigger the upwelling of hot mantle materials from the lower mantle to the shallow mantle beneath the subducting slabs and may cause the slab-plume interactions.

Original languageEnglish
Pages (from-to)31-44
Number of pages14
JournalGeoscience Frontiers
Volume1
Issue number1
DOIs
Publication statusPublished - 2010 Oct

Keywords

  • Big mantle wedge
  • Earthquakes
  • Fluids
  • Intraplate volcanoes
  • Mantle transition zone
  • Subducting slabs

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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