Évolution tectonique de la région des Tuamotu, océan Pacifique Central

Évolution tectonique de la région des Tuamotu, océan Pacifique Central
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太平洋中部土阿莫土地区构造演化

DOI:
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发表时间:
1996
期刊:
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影响因子:
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通讯作者:
A. Gachon
A. Gachon
中科院分区:
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文献类型:
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作者:
M. Munschy;C. Antoine;A. Gachon

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利用现有的地球物理巡航和新的自由空间异常重力网格计算的高度数据的汇编,我们提出了一个新的合成的土阿莫土地区,位于0和30°S之间和200和240°E之间的洋壳的结构和演化。这样就可以更好地理解洋壳的分段:马克萨斯断裂带由225 ° E和230°E之间的两段形成;在222°E以东没有观察到南方断裂带的明显特征;图阿莫图扩张段实际上是由两段向右偏移约150公里形成的。半扩展速率从82 Ma前的23 km/Ma逐渐增加到28 Ma前的109 km/Ma。
Using a compilation of available geophysical cruises and new free-air anomaly gravimetric grids computed from altimetric data, we propose a new synthesis for the structure and evolution of the oceanic crust in the Tuamotu Region, located between 0 and 30°S and between 200 and 240°E. Segmentation of the oceanic crust is then better understood: Marquesas Fracture Zone is formed by two segments between 225 and 230°E; no clear signature of the Austral Fracture Zone is observed to the east of 222°E; the Tuamotu spreading segment is, in fact, formed by two segments right-laterally offset by about 150 km. Half-spreading rates progressively increase from 23 km/Ma 82 Ma ago to 109 km/Ma 28 Ma ago.