Abstract The marine geophysical investigations carried out in the Eastern Arabian Sea revealed the presence of a bathymetric high feature, referred to as the Sagar Kanya Seamount. The preliminary morphology and geophysical characteristics of this feature were studied along a single transect by earlier researchers, however, a detailed geophysical mapping over the entire extent of this feature is still awaited. The present study aims for such a detailed investigation on the Sagar Kanya Seamount and its adjacent regions using newly acquired high-resolution multibeam bathymetry data, complemented with sea surface magnetic and gravity data. Bathymetric map reveals the presence of well-definedbathymetric high features constituting three seamounts connected with structural high/ridge-like features, together representing a large nearly elliptical bathymetric high complex surrounding a region of nearly flat seafloor, referred to as the Sagar Kanya Bathymetric High Complex (SKBHC). The overall morphology of this feature closely resembles with the shape of a submarine volcanic caldera. The gravity anomalies over this feature are mostly correlatable with topography; elliptical-shaped gravity highs are associated with bathymetric highs and gravity lows are associated with the enclosed flat seafloor. Some magnetic anomalies observed over the SKBHC are correlatable with the topographic highs, while others are observed over the flat seafloor. The magnetic anomalies are interpreted as features of post-caldera volcanism. In view of the proximity of this feature to the Reunion hotspot track, and the tectonic framework of the region, the genesis of the SKBHC is attributed to the Reunion hotspot volcanism.

中文翻译：

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Sagar Kanya 测深高综合体：阿拉伯东部已灭绝的巨型海底火山口？

摘要 在东阿拉伯海进行的海洋地球物理调查揭示了一个测深高度特征的存在，称为萨加尔坎亚海山。早期研究人员沿单个断面研究了该特征的初步形态和地球物理特征，但是，仍在等待对该特征整个范围的详细地球物理绘图。本研究旨在使用新获得的高分辨率多波束测深数据，辅以海面磁力和重力数据，对 Sagar Kanya 海山及其邻近地区进行如此详细的调查。水深图显示存在明确的水深高特征，构成三个与结构高/山脊状特征相连的海山，一起代表一个大型近椭圆形的测深高复合体，它围绕着一个几乎平坦的海底区域，被称为萨加尔坎亚测深高复合体（SKBHC）。该特征的整体形态与海底火山口的形状非常相似。该特征上的重力异常主要与地形相关；椭圆形重力高点与测深高点有关，重力低点与封闭的平坦海底有关。在 SKBHC 上观察到的一些磁异常与地形高点有关，而另一些则在平坦的海底上观察到。磁异常被解释为火山口后火山活动的特征。鉴于该特征与留尼汪热点轨迹的接近，以及该地区的构造框架，