| Abstract Submission No. | ABS-2.1-0184 |
| Title of Abstract | Magnetic Mineral Inventory of Indian Ocean Sediments |
| Authors | Firoz Badesab*, Nitin Kadam, Subha Anand, Virsen Gaikwad, Ilaiyarasan M, Srisha Sankarsan Panda, Omkar Sagavekar, Shazia Shaheen, Sakshi Raikar |
| Organisation | CSIR - National Institute of Oceanography, Dona Paula,Goa, India |
| Address | CSIR-National Institute of Oceanography Dona Paula, Goa, India Pincode: 403004 E-mail: firoz2u2002@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | Magnetic minerals are ubiquitous in deep-sea sediments originating from large number of potential sources including terrigenous, biogenic, diagenetic, authigenic, volcanic, cosmogenic, and hydrothermal mineralization. This study focusses on developing a magnetic mineral inventory of the deep-sea sediments from the Indian Ocean region using rockmagnetism, granulometry, and electron microscopy to classify all magnetic mineral phases and investigate their regional distribution, origin, transport and depositional conditions.We conducted suites of room-and high temperature rockmagnetic measurements on sediment cores retrieved from different Indian Ocean regions including Arabian Sea, Bay of Bengal, Ninety East Ridge, Southeast Indian Ridge, Southwest Indian Ridge, Chagos-Laccadive Ridge, and Central Indian Ocean Basin to characterize the different magnetic mineral assemblages. Our results indicate that ferrimagnetic- and antiferromagnetic minerals are the dominant magnetic minerals in the studied sediment cores and exhibit broad grain size and coercivity distributions. Magnetic mineral distribution maps were developed based on the spatial variability of magnetic particles interms of their content, mineralogy, and grain size. Specialized magnetic data coupled with electron microscopy data helped to identify different magnetic mineral phases at each studied site and evaluate the relative contribution of each magnetic mineral phase to the bulk magnetic properties. Magnetic mineral inventory of the Indian Ocean sediments established in this study provided important insights on the distribution of magnetic minerals, characteristics of magnetic carriers, their mineralogy, granulometry, and potential sources. |
| Keywords | Indian Ocean, Magnetic Minerals, Inventory, Source-to-Sink Processes |