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Petrogenesis of zincian spinel from mamandur base metal sulphide prospect, Tamil Nadu
, S SOME, A THAKUR
Published in SPRINGER INDIA
2011
Volume: 78
   
Issue: 4
Pages: 365 - 369
Abstract
Zincian spinels (gahnites) from the Mamandur Zn-Pb-Cu prospect of the Southern Granulite Terrain have been studied. Gahnites in the quartzofeldspathic gneiss occur either as (a) porphyroblastic grains closely in association with cordierite and sphalerite or as (b) inclusions in poikiloblastic quartz grains, restricted within quartz veinlets. Compositionally these gahnites belong to two different clusters corresponding to two modes of occurrences. The origin of the porphyroblastic gahnites is linked with the process of desulphidation of sphalerite whereas those occurring as inclusions within poikiloblastic quartz are direct crystallisation products from silica rich hydrothermal solution. A new compositional field for this latter group of gahnites is proposed here. © 2011 Geological Society of India.
About the journal
JournalData powered by TypesetJournal of the Geological Society of India
PublisherData powered by TypesetSPRINGER INDIA
ISSN0016-7622
Open AccessNo