摘要
近年来 ,尽管不同学科通过不同手段对长白山火山进行过广泛研究 ,然而 ,目前人们对它的起源仍不清楚。利用全球地震层析成像和区域层析成像结果 ,综合分析了长白山火山的起源。结果表明 ,它的起源既不同于夏威夷等板内热点火山 ,也不同于日本等岛弧火山 ,而是一种与太平洋俯冲板块在地幔转换带内的滞留和深部脱水等过程密切相关的弧后板内火山。
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 low-velocity anomaly extending to 400 km with a velocity reduction of up to 4%. High velocity anomalies are visible in the mantle transition zone, and deep-focus 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 back-arc volcano related to the deep subduction and stagnancy of the Pacific slab under Northeast Aisa.
出处
《地球科学进展》
CAS
CSCD
2004年第3期364-367,共4页
Advances in Earth Science
关键词
长白山火山
板内火山
俯冲板块
地震层析成像
Changbai volcano
Intraplate volcanoes
Subducted slab
Seismic tomography.
