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. Overall δ34S of sulphides varies from (+9.67‰ to +34.42‰). Sphalerite ores hosted within older Trikuta Formation and younger Khairikot Formation, however, show different δ34S 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.
Highlights
In the North Western Himalaya, lead and/or zinc sulphide mineralizations in form of pockets/lenses and veins have been reported long back from the Precambrian Sirban Limestone [1]
In the NW Himalaya, sulphide mineralizations known to occur in the Riasi Inlier in Riasi District (J & K) which forms a thick Precambrian carbonate sequence
The upper one is named as Khairikot Formation which is mainly represented by areno-argillaceous rocks and it is divisible into two mapable units composed of chert-breccia, quartzite, slate and variegated shales with a single stromatolite bearing band of dolomite
Summary
In the North Western Himalaya, lead and/or zinc sulphide mineralizations in form of pockets/lenses and veins have been reported long back from the Precambrian Sirban Limestone [1]. Devi stratigraphic control for these sulphides on the basis of absence of the intrusive body near the ore occurrences and field settings. Strong but localized electromagnetic anomalies were suggested for the area indicating local enrichment of sulphide ore in the limestone body [3]. Not much published work is available on the metalogenetic aspect of the Sirban Group except the work of Nayak and Sharma [4], for the sulphide mineralization and Srivastava and Kumar [5] for the magnesite mineralization in Panthal area. Stable sulphur isotope study of lead and zinc ores from all part of the Riasi Inlier is reported
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