TITLE:
Two-Generation of Sphalerite from Pb-Zn Mineralization of Riasi Inlier, Jammu and Kashmir, India: Evidences from Sulphur Isotopes
AUTHORS:
Pankaj K. Srivastava, Ishya Devi
KEYWORDS:
Sulphur Isotopes, Pb-Zn Deposit, Carbonates, Riasi Inlier, Sirban Group
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.5,
May
26,
2015
ABSTRACT: Precambrian carbonate
sequence of Riasi Inlier hosts epigenetic lead-zinc mineralization in the form
of pockets, lenses and veins. The mineralization is having variable Pb:Zn ratio
and shows lithological preferences. The sphalerite rich pockets are
concentrated within the dolostone of older Trikuta Formation while galena rich
mineralization occurs in form of veins, lenses and pockets hosted within siliceous
varieties of dolostone and quartzite belonging to younger Khairikot Formation.
Sulphur isotope geochemistry is reported in the present paper for the
sphalerire and galena from the area for first time. Overallδ34S of sulphides
varies from (+9.67‰ to +34.42‰). Sphalerite ores hosted within older Trikuta
Formation and younger Khairikot Formation, however, show differentδ34S values. It
ranged from +9.67‰ to +10.59‰ for the sphalarite hosted in Trikuta Formation
and from +18.38‰ to +34.42‰ for sphalerite hosted within Khairikot Formation.
Sulphur isotopic data and ore petrographic data suggest that there is
two-generation of sphalerite present in the area.