俯衝極性反轉

俯衝極性反轉（英語：subducation polarity reversal） 是指在會聚邊界，兩個板塊互換角色的地質過程：即上覆板塊成為下降板塊，反之亦然 ^[1]。例如蘇俄太平洋堪察加半島^[2]、印度尼西亞韋塔島 ^[3]等地皆報道有俯衝極性反轉地質過程。

俯衝極性反轉的成因是當兩大洋板塊碰撞時發生，密度較高的大洋板塊往下俯衝，另一塊則覆蓋在下降的板塊之上。 如果俯衝的大洋板塊上帶有大陸地殼，當大陸地殼邊緣被俯衝板塊帶到俯衝帶時，因大陸地殼質輕具浮力，不能向下俯衝，就造成板塊的俯衝變得更慢，甚至可能停止後再進行俯衝極性反轉^[4][5].

參考文獻

1. Arc-Continent Collision | Dennis Brown | Springer. Frontiers in Earth Sciences. Springer. 2011. ISBN 9783540885573
2. Konstantinovskaia, E. A (2001-04-10). "Arc–continent collision and subduction reversal in the Cenozoic evolution of the Northwest Pacific: an example from Kamchatka (NE Russia)". Tectonophysics. 333 (1–2): 75–94. Bibcode:2001Tectp.333...75K. doi:10.1016/S0040-1951(00)00268-7
3. McCaffrey, Robert; Molnar, Peter; Roecker, Steven W.; Joyodiwiryo, Yoko S. (1985-05-10). "Microearthquake seismicity and fault plane solutions related to arc-continent collision in the Eastern Sunda Arc, Indonesia". Journal of Geophysical Research: Solid Earth. 90 (B6): 4511–4528. Bibcode:1985JGR....90.4511M. doi:10.1029/JB090iB06p04511. ISSN 2156-2202
4. Chemenda, A. I.; Yang, R. -K.; Stephan, J. -F.; Konstantinovskaya, E. A.; Ivanov, G. M. (2001-04-10). "New results from physical modelling of arc–continent collision in Taiwan: evolutionary model". Tectonophysics. 333 (1–2): 159–178. Bibcode:2001Tectp.333..159C. doi:10.1016/S0040-1951(00)00273-0
5. Teng, Louis S.; Lee, C. T.; Tsai, Y. B.; Hsiao, Li-Yuan (2000-02-01). "Slab breakoff as a mechanism for flipping of subduction polarity in Taiwan". Geology. 28 (2): 155–158. doi:10.1130/0091-7613(2000)28<155:sbaamf>2.0.co;2. ISSN 0091-7613