| dc.contributor.author |
Nayak, Bibhuranjan |
|
| dc.contributor.author |
Mohapatra, B.K. |
|
| dc.date.accessioned |
2018-10-01T12:20:52Z |
|
| dc.date.available |
2018-10-01T12:20:52Z |
|
| dc.date.issued |
1998 |
|
| dc.identifier.citation |
Mineralogical Magazine, 62(6), 1998: 847-856 |
|
| dc.identifier.issn |
0026-461X |
|
| dc.identifier.uri |
http://ore.immt.res.in/handle/2018/766 |
|
| dc.description.abstract |
Pyrophanite is widely distributed in metamorphic Mn-rich rock assemblages of the Gangpur Group, India. It occurs in two distinct habits: as an independent phase, and as an exsolved phase within hematite. The well developed large sized crystals coexist with spessartine in Mn-silicate facies rocks. In contrast, the exsolved crystals occur as fine needle/bleb-like crystallites intergrown with hematite in Mn-silicate-oxide facies rocks. Compositionally the exsolved crystals are enriched in iron, present in both the ferric and ferrous states. The two morphologies of pyrophanite attest to their formation under different environmental conditions. The independent pyrophanite is formed from a Mn-Ti rich precursor under low oxygen fugacity conditions while the hematite-pyrophanite intergrowth evolved from an Fe-Mn-Ti rich precursor under higher f(O2) conditions. |
|
| dc.language |
en |
|
| dc.publisher |
Mineralogical Society |
|
| 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 |
Two morphologies of pyrophanite in Mn-rich assemblages, Gangpur Group, India |
|
| dc.type |
Journal Article |
|
| dc.affiliation.author |
CSIR-IMMT, Bhubaneswar 751013, Odisha, India |
|