Petrogenesis of zincian spinel from mamandur base metal sulphide prospect,Tamil Nadu |
| |
| Authors: | Biswajit Ghosh Sandip Some Animesh Thakur |
| |
| Institution: | (1) Dept. Geology, University of Rajasthan, 302004 Jaipur, India |
| |
| 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
