| Abstract Submission No. | ABS-1.1-0090 |
| Title of Abstract | Tracing Provenance to Pollution: Reviewing Rare Earth Geochemistry of India¿s East Coast. |
| Authors | ARUBAM KHELEN CHANU*, Muhammed Najih M |
| Organisation | CSIR-NIO |
| Address | CSIR-NATIONAL INSTITUTE OF OCEANOGRAPHY PANJIM, Other, India Pincode: 403004 E-mail: khelenchanu.nio@csir.res.in |
| Country | India |
| Presentation | Oral |
| Abstract | India¿s eastern coastline hosts extensive estuarine and mangrove systems where Rare Earth Elements (REEs) record both natural processes and human impacts. This review compiles and analyzes existing research on their distribution and geochemical behavior, highlighting implications for sediment provenance, pollution sources, and coastal biogeochemical cycling. REE patterns are generally flat but show notable element-specific variations. Cerium (Ce) anomalies range from absent to distinctly negative or positive, with negative anomalies linked to Ce scavenging and the reduction of insoluble Ce(IV) to soluble Ce(III) under alkaline, reducing conditions, and positive anomalies reflecting alternative geochemical processes. Europium (Eu) anomalies vary from slightly negative to positive, suggesting changing redox conditions and diverse sedimentary inputs. Gadolinium (Gd) anomalies span approximately 0.8 to 1.22, with distinctive signatures reported from sites such as Pichavaram, Nagavali, Vamsadhara, and Subarnarekha. Collectively, these datasets reveal a coastline influenced by both natural sedimentary inputs and localized anthropogenic activities, allowing differentiation of river-dominated systems from those impacted by aquaculture and industrial effluents. |
| Keywords | Rare earth elements, East Coast, mangroves, estuaries. |