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Nagasundaram, M.
- Extensive Occurrence of Fe–Mn Crusts and Nodules on Seamounts in the Southern Andaman Sea, India
Abstract Views :199 |
PDF Views:69
Authors
A. C. Dinesh
1,
N. V. Nisha
1,
Saju Varghese
1,
Rachna Pillai
1,
Durga Prasad
2,
Satyendra Baraik
3,
Rajani P. Ramesh
1,
Rajesh Kumar Joshi
4,
Soibam I. Meitei
4,
B. K. Jishnu
1,
R. V. Manoj
4,
M. Nagasundaram
4
Affiliations
1 Geological Survey of India, Op: WC-I, Southern Region, Mangalore 575 001, IN
2 Geological Survey of India, Eastern Region, Kolkata 700 091, IN
3 Geological Survey of India, Southern Region, Op: EC-II, Vishakhapatnam 530 018, IN
4 Geological Survey of India, Eastern Region, Op: EC-I, Kolkata 700 091, IN
1 Geological Survey of India, Op: WC-I, Southern Region, Mangalore 575 001, IN
2 Geological Survey of India, Eastern Region, Kolkata 700 091, IN
3 Geological Survey of India, Southern Region, Op: EC-II, Vishakhapatnam 530 018, IN
4 Geological Survey of India, Eastern Region, Op: EC-I, Kolkata 700 091, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 704-708Abstract
A reconnaissance survey for Fe–Mn crusts and nodules from West Sewell Ridge (WSR) and Sewell Rise (SR) in the Andaman Sea revealed their widespread occurrence along the summit of the ridge and on the slopes. Remotely operated vehicle (ROV) dive observations illustrate that the crusts are more concentrated on massive exposures at water depth of 800– 900 m and nodules swamped in foraminiferal ooze at water depth from 600 to 1100 m. During the ROV dives, massive, smooth, macro-botryoidal, flat, granular, gritty, coarse and knobby nature of Fe–Mn crusts and nodules have been observed. Nodules and crusts collected onboard were mostly black, brownish-black and pitch black in colour. Nodules show rough, botryoidal and granular/sacchoroidal texture. The diameter of the nodules increased up to 13 cm. They showed distinctly arranged concentric layers. The recovered crusts were mostly detached pieces without substrate.Keywords
Fe–Mn Crusts and Nodules, Reconnaissance Survey, Rare Earth Elements, Remotely Operated Vehicle, Seamounts.Full Text
- Accumulation and Enrichment of Platinum Group Elements in Hydrogenous Fe–Mn Crust and Nodules from The Andaman Sea, India
Abstract Views :185 |
PDF Views:84
Authors
Saju Varghese
1,
Rajani P. Ramesh
1,
Rachna Pillai
1,
Sethu Rose Joseph
2,
B. Gopakumar
1,
Resmi Sathikumar
3,
Rajesh Kumar Joshi
4,
Priyanka Dey Guha
4,
R. V. Manoj
1,
M. Nagasundaram
4
Affiliations
1 Geological Survey of India, Op: WC-I, Southern Region, Mangalore 575 001, IN
2 Geological Survey of India, Op: WC-II, Southern Region, Cochin 682 037, IN
3 Geological Survey of India, Eastern Region, Kolkata 700 091, India, IN
4 Geological Survey of India, Eastern Region, Kolkata 700 091, IN
1 Geological Survey of India, Op: WC-I, Southern Region, Mangalore 575 001, IN
2 Geological Survey of India, Op: WC-II, Southern Region, Cochin 682 037, IN
3 Geological Survey of India, Eastern Region, Kolkata 700 091, India, IN
4 Geological Survey of India, Eastern Region, Kolkata 700 091, IN
Source
Current Science, Vol 120, No 11 (2021), Pagination: 1740-1748Abstract
Present study explores the processes influencing the concentration, mechanism of incorporation and sources of Platinum Group of Elements (PGE) in hydrogenous ferromanganese crusts and nodules (hereafter crusts and nodules) from the West Sewell Ridge and Sewell Rise in the Andaman Sea. ΣPGE content is lower in nodules (633 ppb) as compared to crusts (average = 1284 ppb) due to the diagenetic influence. The chondrite-normalized PGE patterns of crusts and nodules demonstrate consistent Platinum (Pt) enrichment and Palladium (Pd) depletion. We suggest that Pt, Iridium (Ir), and Ruthenium (Ru) are scavenged from seawater by sorption and oxidation on δ-MnO2 surfaces of suspended ferromanganese oxyhydroxides. However, non-correlation of Pd with other trace elements revealed its nonaccumulation in crusts and nodules. Different PGE ratios reveled that Ir and Pd originated largely from a cosmogenic source and Ru, Rh, and Pt were probably sourced from ophiolites in the Andaman Accretionary Prism.Keywords
Accumulation and Enrichment, Crusts, Hydrogenous Ferromanganese Deposits, Nodules, Platinum Group Elements.Full Text
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