Hi this is for igneous petrology. I did some research on this topic. But I still

Question

Hi this is for igneous petrology. I did some research on this topic. But I still don’t know why magmatism occurs at baitoushan And is it a plate margin? What geochemical endmembers may be involved (indicate crust, mantle, lithosphere athensophere. Etc.

Great Xing'an Range Songliao Basin Changbaishan 100 200 "hot spot 300 i 400 s00 600 700 E 800 900 Zone of Cold Slab a 1000 1100 1200 1300 1400 1500 S-wave Tomography 114 116 1 18 120 122 124" 126" 128 13 (w/ appreciation and permission; NECESSArray: Tang et al., 2012; Fall AGU Meeting)

Explanation / Answer

The Changbaishan volcanic complex, located on the border between China and North Korea, lies approximately 1,300 km away from the Japan Trench subduction zone and is unlikely to result from a mantle plume rising from a thermal boundary layer at the base of the mantle.

Subduction-induced upwelling process produces decompression melting that feeds the Changbaishan volcanoes. Subduction-induced upwelling may also explain back-arc volcanism observed at other subduction zones.

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