| dc.contributor.author |
Mohapatra, B.K. |
|
| dc.contributor.author |
Nayak, Bibhuranjan |
|
| dc.date.accessioned |
2018-10-01T12:20:46Z |
|
| dc.date.available |
2018-10-01T12:20:46Z |
|
| dc.date.issued |
1998 |
|
| dc.identifier.citation |
Journal Of The Geological Society Of India, 51(4), 1998: 509-515 |
|
| dc.identifier.issn |
0016-7622 |
|
| dc.identifier.uri |
http://ore.immt.res.in/handle/2018/743 |
|
| dc.description.abstract |
Manganite gamma-MnOOH, in the manganese-rich rocks of Precambrian Gangpur Group, Sundargarh district, Orissa, shows dissimilar fabrics and belongs to three generations but has more or less similar chemical composition. It occurs as patchy inclusions, accicular crystallites, egg-shaped micro-nodules, medium to coarse-grained mosaics, vein and fissure fillings and as wedge-shaped linings. The manganite is either formed from Mn-oxide (jacobsite and vredenburgite) phases through retrogressive metamorphic transformation (Ma1) or generated through pseudomorphic replacement of Mn-sillicate (rhodonite and tephroite) or Mn-carbonate (rhodochrosite) by chemical weathering under supergene conditions (Ma2). The vein filling type is the latest in its paragenesis (Ma3). Despite different mineral lineages, manganites are chemically similar though crystallites located in veins and fissures are relatively pure. |
|
| dc.language |
en |
|
| dc.publisher |
Geological Society Of India |
|
| dc.relation.isreferencedby |
SCI |
|
| dc.rights |
Copyright [1998]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository. |
|
| dc.subject |
Geosciences |
|
| dc.title |
Characteristics of manganite (gamma-MnOOH) in manganese-rich Gangpur group of rocks, Orissa |
|
| dc.type |
Journal Article |
|
| dc.affiliation.author |
CSIR-IMMT, Bhubaneswar 751013, Odisha, India |
|