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Application of liberation analysis in ferromanganese encrustations from South Andaman Sea: An automated mineral identification technique using TIMA

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Title Application of liberation analysis in ferromanganese encrustations from South Andaman Sea: An automated mineral identification technique using TIMA
 
Creator Manoj, R V
Rajani, P R
Kumar, M Girish
Gopakumar, B
Joshi, R K
Resmi, S
 
Subject Ferromanganese encrustations
Liberation analysis
Primary phase
Scanning electron microscope
Sewell Rise
TIMA
West Sewell Ridge
 
Description 918-929
Automated scanning electron microscopic studies got wide acceptance in identification of various mineral phases; its
classification and characterization based on their composition and abundance in semi quantitative manner. Nowadays, these
techniques are adopted in understanding various poorly crystalline and amorphous materials to reveal the actual mineral
assemblages. Primary mineral phases of five ferromanganese crust and nodule samples collected from West Sewell Ridge
and Sewell Rise in South Andaman Sea are studied using automated mineral analyser to understand the mineral assemblages
and their micro textures. The internal morphology of these encrustations is densely parallel to sub parallel micro botryoidal
textures indicating colloidal precipitated origin from ambient seawater. Since crust and nodules are formed by colloidal
precipitation, unclassified materials observed in primary phase analyses may represent the presence of poorly crystalline and
amorphous ferromanganese colloidal phases. The liberation analysis, Back Scattered Electron image (BSE), Energy
Dispersive X-ray Spectroscopy (EDS), and elemental mapping of the samples revealed occurrence of manganese - iron oxyhydroxides
as alternate laminations/ thin layers along with detrital materials; that forms the composition and internal texture.
Major mineral phases identified from liberation analysis using TIMA are todorokite, vernadite, Fe vernadite, cryptomelane,
ferrogedrite, glauconite, Fe oxides disseminated, quartz, biotite, orthoclase, illite, plagioclase, amphibole, zinwaldite, and
romanechite. Thus, automated mineral identification using TIMA can be effectively adopted for mineral phase identification
in ferromanganese encrustations, which is rather difficult using other techniques.
 
Date 2023-07-11T06:18:56Z
2023-07-11T06:18:56Z
2023-07
 
Type Article
 
Identifier 2582-6727 (Online); 2582-6506 (Print)
http://nopr.niscpr.res.in/handle/123456789/62295
https://doi.org/10.56042/ijms.v51i11.3509
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJMS Vol.51(11) [November 2022]