基于全球板块运动模型分析大西洋扩张变化

Analysing the Extending of Atlantic Based on Global Plate Motion Models

基于现代空间测量技术 SL R、VL BI和 GPS实测资料 ,解算出大西洋中脊海底扩张速率 ,其中北大西洋的东西向扩张速率平均为 35 mm/ a,赤道大西洋东西向扩张速率分别为 2 0～ 2 5 mm/ a,南大西洋东西向扩张速率为 2 2～2 8mm/ a,证实全球板块运动的存在及大西洋扩张学说 ,并基于全球几百万年地质模型 NNR- NU VEL1A,北大西洋的东西向扩张速率平均为 2 4.3m m/ a,基于最新全球板块运动模型 ITRF2 0 0 0 VEL,北大西洋的东西向扩张速率平均为 2 0 .8mm/ a,总体上大西洋实测东西扩张速度与根据地学资料推出的地球板块运动模型和最新ITRF2 0 0 0 VEL

The horizontal extending rates of the north ,equator and south Atlantic ridge are about 35mm/a?20~25mm/a?22~28mm/a at east-west direction ,respectively ,based on the space geodetic data collected by highly sophisticated techniques such as VLBI, SLR, GPS and DORIS, which shows that the global plate is moving and testifies the LysenKoism continental drift. In this paper, a new present-day global plate motion ITRF2000VEL is determined on the basis of space geodetic data, incorporating the ITRF2000 velocity field that was free of any additional tectonic plate model assumption and was published in 2000 by IERS. The horizontal extending rates of the north Atlantic is 24.3mm/a based on NNR-NUVEL1A and 20.8 mm/a based on the newest model of the ITRF2000, the results are almost consistent based on the two models in the whole.