Tectonics of the Indo-Australian plate near the Ninetyeast Ridge constrained from marine gravity and magnetic data
Tectonics of the Indo-Australian plate near the Ninetyeast Ridge constrained from marine gravity and magnetic data
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DOI：
10.1007/s11802-017-3314-8
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发表时间：
2017-05
影响因子：
1.6
通讯作者：
Jie Chen;Jinchang Zhang
中科院分区：
文献类型：
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作者：
Jie Chen;Jinchang Zhang
虽然第九海脊附近的印度-澳大利亚板块对于理解新板块边界的形成具有重要意义，但其构造问题复杂，而且大多数都鲜为人知。本文以测深、重磁等资料为基础，进行了详细的构造分析。水深和重力图显示了许多褶皱的形态特征，这些褶皱与印度板块和亚洲板块碰撞导致的印度-澳大利亚板块的板内变形有关。重力异常显示了由海底扩张和转换断裂作用引起的断裂带结构。褶皱和断裂带的特征与印度-澳大利亚板块内部将出现扩散的板块边界和重新定义的板块成分的假设一致。此外，汇编的磁性数据显示了磁性线条、废弃的扩张中心、向南的海脊跳跃和板块运动。这些特征为重建研究区的构造演化史提供了有用的信息。磁异常表明，转换断层型的附加板块边界正在发育。
Although the Indo-Australian plate near the Ninetyeast Ridge is important for understanding the formation of new plate boundaries, its tectonic problems are complex and most of them are poorly known. This paper made a detailed tectonic analysis based on the data of bathymetry, gravity and magnetics. Bathymetry and gravity maps show morphological features of many folds, which are related to the intraplate deformation of the Indo-Australian plate due to the collision between the Indian and Asian plates. Gravity anomalies show the structure of fracture zones, which are caused by the seafloor spreading and transform faulting. The characteristics of the folds and fracture zones are consistent with the hypothesis that diffuse plate boundaries and redefined plate components would occur within the Indo-Australian plate. In addition, compiled magnetic data demonstrate magnetic lineations, abandoned spreading centers, southward ridge jumps and plate motions. These features provide useful information for rebuilding the tectonic evolution history of the study area. Magnetic anomalies suggest that an additional plate boundary of transform fault type is developing.