Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

A Note on the Origin of Chrome Grossular Garnet (Uvarovite) in Calc-Silicate from Bandihalli, Tumkur District, Karnataka


Affiliations
1 The Mineralogical Institute, Manasa Gangotri, Mysore - 570006, India
2 Department of Geology, Manasa Gangotri, Mysore-570006, India
 

   Subscribe/Renew Journal


The green garnets found in the calc-silicate horizons around Bandihalli, is a chrome grossular (∼7% Cr2O3) with appreciable amount of Mn content. Thus, a partial miscibility between uvarovite and spessartite end members appears possible. The occurrence of thin band of graphite bearing quartzite within the calc-silicate horizons points to its metasedimentary origin. The presence of another variety of garnet (pyrope-almandine rich) in the associated cordierite bearing rock of the area shows that the composition of garnet may not be wholly dependant on grade of metamorphism.
Subscription Login to verify subscription
User
Notifications
Font Size

Abstract Views: 188

PDF Views: 153




  • A Note on the Origin of Chrome Grossular Garnet (Uvarovite) in Calc-Silicate from Bandihalli, Tumkur District, Karnataka

Abstract Views: 188  |  PDF Views: 153

Authors

M. N. Viswanathiah
The Mineralogical Institute, Manasa Gangotri, Mysore - 570006, India
M. A. Shankara
The Mineralogical Institute, Manasa Gangotri, Mysore - 570006, India
A. S. Janardhan
Department of Geology, Manasa Gangotri, Mysore-570006, India

Abstract


The green garnets found in the calc-silicate horizons around Bandihalli, is a chrome grossular (∼7% Cr2O3) with appreciable amount of Mn content. Thus, a partial miscibility between uvarovite and spessartite end members appears possible. The occurrence of thin band of graphite bearing quartzite within the calc-silicate horizons points to its metasedimentary origin. The presence of another variety of garnet (pyrope-almandine rich) in the associated cordierite bearing rock of the area shows that the composition of garnet may not be wholly dependant on grade of metamorphism.