- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
Abstract Submission No. | ABS-2022-13-0361 |
Title of Abstract | Geophysical investigation over the axial seamount chain in the Laxmi Basin, Eastern Arabian Sea |
Authors | J. John Savio*, V. Yatheesh |
Organisation | CSIR-National Institute of Oceanography & SEOAS Goa University |
Address | Geological Oceanography Division, CSIR-National Institute of Oceanography, Panaji, Goa, India Pincode: 403004 Mobile: 8943328085 E-mail: savio@nio.org |
Country | India |
Presentation | Oral |
Abstract | The Laxmi Basin is the deep offshore region existing between the northwestern continental margin of India and the NW-SE trending segment of the Laxmi Ridge in the Eastern Arabian Sea. The Laxmi Basin contains a linear seamount chain that constitute the Raman Seamount, Panikkar Seamount and Wadia Guyot, located over the axial basement high representing the Panikkar Ridge. The geomorphology of this seamount chain was studied in detail by earlier researchers; however, its detailed characteristic geophysical signatures are yet to be clearly established. We attempted for detailed understanding of the geophysical signatures over the spatial extent of these seamounts using a fresh set of multibeam bathymetry and sea-surface gravity and magnetic anomalies, complemented by the existing geophysical data. The high-resolution multibeam bathymetry maps of these seamounts were prepared to understand the morphological characteristics these three seamounts. The free-air gravity anomaly map shows that the seamounts are associated with a very short wavelength gravity high, superimposed on the short wavelength gravity low of the Panikkar Ridge. The major part of the Raman Seamount, Wadia Guyot and the major peak of Panikkar seamount are characterized by magnetic lows, with their minima located in the southern, northwestern and northern parts, respectively. The isochron map of the Laxmi Basin region, updated using the additional magnetic anomalies used in the present study, shows that the western and eastern sides of the Laxmi Basin seamount chain are closely bounded by the magnetic isochron representing chron C28ny (~62.5 Ma), implying an age younger to 62.5 Ma for the genesis of these seamounts. |