Mineralogy,geochemistry and genesis of the massive base metal sulfide deposits of Chitradurga (Ingaldhal), Karnataka,India |
| |
| Authors: | SM Naqvi T Hanumanth Rao R Natrajan K Satyanarayana V Divakara Rao SM Hussain |
| |
| Institution: | 1. National Geophysical Research Institute, Hyderabad India;2. Defence Metallurgical Research Laboratory, Hyderabad India |
| |
| Abstract: | The Chitradurga base metal sulfide deposit is associated with eugeosynclinal metabasalts (～ 2.5 b.y.) and banded pyritiferous cherts. The pre-tectonic character of the deposit and meta-volcanics is indicated by their deformational textures, structures and radioactive age data. The mineral assemblages of these ores are similar to the Zn-Cu type of massive sulfide deposits associated with Archean—Early Precambrian eugeosynclinal metavolcanics in other shield areas. The deposit has a rather high concentration of Co; microprobe data indicate that most of it is found as cobaltite and linnaeite and that it is inhomogenously distributed in these minerals. Very strong sympathetic correlation between Co and Cu, and the simultaneous increase of both of these elements with depth has been found. The geochemistry of the Chitradurga ores and metabasalts, especially their Zn:Cu:Pb and Pb:Zn ratios, suggests that the base metal sulfide content is probably genetically related to the basaltic flows. It appears that the Chitradurga deposit belongs to the ‘massive volcanogenic’ Cu-rich class of sulfide deposits. The metal content of the ores appears to have been supplied by rapidly degassing highly undifferentiated protomantle along with the basaltic magma. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
