TITLE:
Mineragraphic Study of Manganese Ore Deposits of Kandri, Mansar, Beldongri and Satak Mines, Nagpur District (Maharashtra) Central India
AUTHORS:
Talat Jawed, F. N. Siddiquie
KEYWORDS:
Sausar Belt, Precambrian, Metasediments, Manganese Mineralization, Central India
JOURNAL NAME:
International Journal of Geosciences,
Vol.5 No.7,
June
23,
2014
ABSTRACT:
In Nagpur, M.P.-Maharashtra Manganese Belt is
exposed which is part of Sausar Belt. In Nagpur, four manganese mines viz
Mansar, Kandri, Beldongri and Satak are selected for the ore microscopic study.
These mining areas are situated in that part of Central India which are highly
deformed and metamorphosed and are characterised by high grade amphibolite
facies to low grade greenschist facies. The Precambrian manganese ore deposits
of Nagpur are formed by the metasediments of Sausar belt which is rich in
manganese sediments. The manganese ores of the study area are co-folded with
distinct rock types i.e. “gondites”
and predominantly composed of a mixture of braunite, bixbyite, hausmannite,
hollandite, jacobsite, vredenburgite, pyrolusite, cryptomelane and psilomelane.
The dominant rocks are tirodi migmatitic gneiss, argillaceous and calcareous
rock types. This paper discusses the mineralogy of the manganese ores of Kandri,
Mansar, Satak and Beldongri. After the careful assessment of mineralogy,
texture and paragenesis of the manganese ore of the study area, it has been
concluded that the manganese ores of the study area are formed by the multiple
processes i.e. metamorphism and
supergene enrichment. These supergene enrichments are evidence of colloidal
influx. Occurrence of free braunite, free hausmannite and free jacobsite
indicates the high grade metamorphism. Pyrolusite, rhodonite, and
psilomelane-cryptomelane are formed by supergene enrichment. The presence of
lamellar twinning in braunite indicates about shear pressure. In this area the
different manganese mineral assemblages and their textures suggest about the
occurrence of different metamorphic activity and depositional environment. The
texture and paragenesis of manganese ore of the study area are discussed here.