Abstract

The present study attempts to structural and tectonic interpretation around the Laccadive ridge in the Western Indian Ocean using EGM2008 Bouguer gravity data. The different derivatives of EGM2008 Bouguer gravity data indicate that the tectonic boundaries are predominantly confined in the N-S and NNW-SSE directions followed by E-W and NE-SW trends. The Euler deconvolution result suggests that the deformities in the region are of both crustal- and lithospheric-scales. The gravity highs/lows in the study area are analyzed based on sediment/crustal thickness and Moho depth estimated using radially averaged power spectrum technique. The study highlights the Moho undulation followed by crustal thickening/thinning underneath the Laccadive ridge and its surroundings for their anomalous gravity signatures. The affinity of the structural pattern observed in the Laccadive ridge region with continent trends, moderate crustal thickness and shallower Moho observed below the Laccadive ridge axis, suggest thinned rifted continental crust with shallow basement.

摘要

本研究试图利用 EGM2008 布格重力数据对西印度洋拉卡代夫海脊周围的构造和构造进行解释。EGM2008 布格重力数据的不同导数表明，构造边界主要局限在 NS 和 NNW-SSE 方向，其次是 EW 和 NE-SW 趋势。欧拉反卷积结果表明，该区域的畸形具有地壳尺度和岩石圈尺度。基于沉积物/地壳厚度和使用径向平均功率谱技术估计的莫霍面深度分析研究区的重力高/低。该研究强调了莫霍面起伏，随后是拉卡代夫脊下方的地壳增厚/变薄及其周围环境的异常重力特征。