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Dinesh, A. C.
- Andaman Accretionary Prism:A Probable Locale for Different Mineral Deposit Types
Abstract Views :248 |
PDF Views:103
Authors
Affiliations
1 OPEC-1, M&CSD, ER, Geological Survey of India, Salt Lake, Kolkata 700 091, IN
1 OPEC-1, M&CSD, ER, Geological Survey of India, Salt Lake, Kolkata 700 091, IN
Source
Current Science, Vol 109, No 3 (2015), Pagination: 529-535Abstract
Crustal growth and stabilization in the Andaman accretionary prism (AAP) occur via accretion of allochthonous crust, fragments of oceanic plateaus, and dismembered juvenile arc and ophiolite sequences. Multiple sutures developed in the AAP, as evidenced from multibeam, magnetic and seismic studies, are envisaged as the first-order structures that determine its distinct metallogenic signature. Furthermore, development of Andaman Back Arc Spreading Centre (ABSC) is attributed to a change from compression to more transgression stress regime as the AAP evolves. This stress regime change generates the first-order conduits for episodes of extensive metalliferous fluid flow via the pathways created by significant lateral displacements along the terrane-bounding multiple sutures. Hence, like many other accretionary orogens, complex association between subduction of the Indian plate and associated accretion, deformation, crustal thickening and melting, metamorphism, burial and exhumation may result in a wide variety of magma types, metal source regions and hydrothermal conduits. In conclusion, the expected deposit types in the AAP are volcanogenic massive sulphide deposits, seafloor massive sulphide deposits, rare earth elements and yittrium deposits and podiform chormite deposits.Keywords
Accretionary Prism, Fluid Migration, Hydrothermal Conduits, Mineral Deposits.- High Incidence of Scandium and REY in Garnets from Coastal Sands of India
Abstract Views :300 |
PDF Views:75
Authors
Affiliations
1 Marine and Coastal Survey Division, Geological Survey of India, Mangaluru 575 001, IN
1 Marine and Coastal Survey Division, Geological Survey of India, Mangaluru 575 001, IN
Source
Current Science, Vol 117, No 1 (2019), Pagination: 20-21Abstract
The economic heavy mineral suite in beach, dune and offshore sands of Odisha, Andhra Pradesh (AP), Tamil Nadu (TN) and Kerala coasts in India mainly comprises ilmenite, garnet, sillimanite, rutile, monazite and zircon. The garnet collected from Kalingapatnam coast, AP reported high incidence (point analysis by EPMA) of rare earth elements (REE) (1500–5300 ppm) especially HREE1. EPMA of a few garnet grains collected off Anjengo, Kerala, also showed encouraging REE (1200–5000 ppm) values2. Nine sand samples were collected from Taingapatnam, Nanjam, Manavalakurichi, Kanyakumari and Uvary in TN, and Santepalle, Bhavanapadu and Yarada in AP (Figure 1) from Indian coast to understand the REE concentrations in garnets. Among the nine, seven samples, viz. GRT-1 (ST-216), GRT-2 (ST-171), GRT-3 (ST-171), GRT-5 (SS-106), GRT-6 (SS-106), GRT-7 (SS-140) and GRT-8 (SS-140) were collected during cruises of Marine and Coastal Survey Division (MCSD), Geological Survey of India (GSI) and the remaining two samples, viz. GRT-10 and GRT-11 were collected from IREL Research Centre, Kollam and AMD, Thiruvananthapuram respectively. These samples contain economically important heavy minerals in different proportions and were subjected to multiple processes for enriching garnet at IREL Research Centre, Kollam, using REDMS (rare earth drum magnetic separator), CSS (corona static separator), EPS (electrostatic plate separator), IRMS (induced roll magnetic separator) and diiodomethane (3.3 specific gravity) to make the samples >95% enriched in garnet. The enriched garnet samples were subjected to HR-ICPMS and XRD analyses for trace elements and mineral phases respectively, at the National Institute of Oceanography (NIO), Goa.References
- Panda, N. K., Sahoo, P., Rao, A. Y., Ramesh Kumar, K. and Rai, A. K., J. Geosci. Res. Spec. Vol., 2017, 1, 131–138.
- Beena, S., Subhash, N., Gopakumar, B., Vidya, S., Anju, P. V. and Vhatkar, K. L., Report on Evaluation of Heavy Mineral Resources in Marine Sediments off Anjengo, Trivandrum District, Kerala, Unpub. Report, Geol Surv. India, 2017.
- Rudnick, R. L. and Gao, S., In The Crust: Treatise on Geochemistry (ed. Rudnick, R. L.), Elsevier-Pergamon, Oxford, UK, 2003, 3, 1.64.
- Arbuzov, S. I., Volostnov, A. V., Mezhibor, A. M. and Rybalko, V. I., Int. J. Coal Geol., 2014, 125, 22–35.
- Franus, W., Wiatros-Motyka, M. M. and Wdowin, M., Environ. Sci. Pollut. Res., 2015, 22, 9464–9474.
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- http://www.scandiummining.com/s/scandium.asp
- https://seekingalpha.com/article/4099363-scandium-boom-next-look-scandium-miners
- Deady, E., Mouchos, E., Goodenough, K., Williamson, B. and Wall, F., In 1st European Rare Earth Resources Conference, Milos, 4–7 September 2014, pp. 397–408.
- Extensive Occurrence of Fe–Mn Crusts and Nodules on Seamounts in the Southern Andaman Sea, India
Abstract Views :205 |
PDF Views:73
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