俯冲极性反转

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俯冲极性反转（英語：subducation polarity reversal） 是指在会聚邊界，两个板块互换角色的地质过程：即上覆板块成为下降板块，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]等地皆報道有俯冲极性反转地质过程。

俯冲极性反转的成因是当兩大洋板塊碰撞時發生，密度较高的大洋板块往下俯冲，另一块則覆盖在下降的板块之上。 如果俯冲的大洋板块上帶有大陆地壳，當大陆地壳邊緣被俯冲板块帶到俯冲帶時，因大陆地壳質輕具浮力，不能向下俯冲，就造成板块的俯冲变得更慢，甚至可能停止后再進行俯冲极性反转[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
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