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A Gravity and Bathymetric Study in the South East Continental Margin ofIndia

机译：印度东南大陆边缘的重力和测深研究

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The Eastern Continental Margin of India (ECMI) has formed as an upshot of separation of India from Antarctica during the early cretaceous period and subsequent seafloor spreading led to the evolution of Bay of Bengal. The study area, which lies between latitude 8° to 14°N and longitude 77.5° to 81°E, has been selected to delineate the width of the continental shelf region of the south east coast of India. GEBCO bathymetry data and Satellite gravity data has been used for the present study. The bathymetry contour map generated by GEBCO bathymetry data shows gradual increase in the depth from the coastal region (~100 m) to the central basin (~3700 m) and nearly follows a N-S trend from Karikal to Chennai. 24 profiles were extracted from the bathymetric as well as satellite gravity grid. The profiles were created perpendicular to the coastal margin. The maximum width of shelf (~45 km) is observed along the coast near Mamallapuram which is the river mouth of Palar River. Shelf width is gradually decreasing from Chennai to Karikal and the continental slope is also very steep. On the southern part of it, the continental shelf of India merges with that of Srilanka. Further south, in the Mannar basin, the shelf width ranges from 25 to 33 km. The continental shelf region is marked by a relatively high (-40 to 40 mGal) compared to the low gravity anomaly (-40 to -180 mGal) observed towards the basinal area. A local gravity high compared to the surroundings centered at 80.6????E and 11.8????N can be associated with the offshore extension of Moyar- Bhavani shear zone, which dissects south Indian terrain.
机译：印度东部大陆边缘（ECMI）的形成是白垩纪初期印度与南极洲分离的结果，随后的海底扩张导致了孟加拉湾的演变。研究区域位于北纬8°至14°N和东经77.5°至81°之间，已被选定来描绘印度东南沿海大陆架区域的宽度。 GEBCO测深数据和卫星重力数据已用于本研究。由GEBCO水深测量数据生成的水深轮廓图显示，从沿海地区（〜100 m）到中部盆地（〜3700 m）的深度逐渐增加，并且几乎遵循从Karikal到Chennai的N-S趋势。从测深和卫星重力网格中提取了24个剖面。这些剖面是垂直于沿海边缘而创建的。在帕拉河的河口Mamallapuram附近的海岸观察到最大的架子宽度（约45 km）。从钦奈到卡里卡尔，陆架宽度逐渐减小，大陆坡也非常陡峭。在它的南部，印度的大陆架与斯里兰卡的大陆架合并。在更南边的Mannar盆地，陆架宽度为25至33 km。与向盆地地区观察到的低重力异常（-40至-180 mGal）相比，大陆架区域的特征是相对较高（-40至40 mGal）。与周围以E为80.6和N为11.8的环境相比，局部重力较高可能与剖析南印度地形的Moyar-Bhavani剪切带的海上延伸有关。

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