Tectonics of the Indo-Australian plate near the Ninetyeast Ridge constrained from marine gravity and magnetic data

被引:0
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作者
Jie Chen
Jinchang Zhang
机构
[1] State Oceanic Administration,South China Sea Institute of Planning and Environmental Research
[2] State Oceanic Administration,Key Laboratory for Ecological Environment in Coastal Areas
[3] State Oceanic Administration,Key Laboratory of Integrated Marine Monitoring and Applied Technologies for Harmful Algal Blooms
[4] Chinese Academy of Sciences,Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology
[5] Ministry of Land and Resouces,Key Laboratory of Marine Mineral Resources
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关键词
Indian Ocean; Ninetyeast Ridge; Indo-Australian plate; plate tectonics; marine geophysics;
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摘要
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.
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页码:403 / 410
页数:7
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