THE RELATIONSHIP BETWEEN THE ORIGIN OF THE INTRAPLTE CHANGBAI VOLCANO AND THE SUBDUCTING PACIFIC SLAB
Received date: 2004-04-09
Revised date: 2004-04-19
Online published: 2004-06-01
We used global seismic tomography and regional tomography to study the deep structure and origin of the Changbai intraplate volcano in Northeast China. Our results reveal a lowvelocity anomaly extending to 400 km with a velocity reduction of up to 4%. High velocity anomalies are visible in the mantle transition zone, and deepfocus earthquakes occur at depths down to 600 km under the region,suggesting that the subducting Pacific slab is stagnant in the mantle transition zone under Northeast Asia.These results suggest that the intraplate Changbai volcano is not a hotspot like Hawaii but a kind of backarc volcano related to the deep subduction and stagnancy of the Pacific slab under Northeast Aisa.
LEI Jianshe, ZHAO Dapeng . THE RELATIONSHIP BETWEEN THE ORIGIN OF THE INTRAPLTE CHANGBAI VOLCANO AND THE SUBDUCTING PACIFIC SLAB[J]. Advances in Earth Science, 2004 , 19(3) : 364 -367 . DOI: 10.11867/j.issn.1001-8166.2004.03.0364
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