Abstract

The Dzhida ore field includes Pervomaika (Mo), Inkur (W) and Kholtoson (W) deposits. This article presents stable and radiogenic isotopic data (O, C, D, S, Sr and Nd) in an attempt to better understand the petrogenetic processes and the problem concerning the sources of ore-forming fluids. Granites from the Pervomaika deposit, which includes Mo-ores, as well as the syenite dikes that precede W-mineralization, have low δ18O values (about 5‰ and 4‰ respectively), and low initial ratios 87Sr/86Sr (0.704–0.705). The εNd (T) values (+0.9–−1.1) in granites and syenites are close to the evolution trend of the mantle-derived source. It was determined that a mantle-derived source was involved in ore-forming processes. It was also confirmed that δ34S values in sulfide minerals (molybdenite, pyrite, sphalerite, galena, and chalcopyrite) were close to the meteoric standard (from −2‰ to +2‰). The δ13C and δ18O values in carbonate minerals (rhodochrosite and ankerite) of the Kholtoson deposit are located within the primary igneous carbonatite (PIC)-square, as a possible juvenile source of CO2. This was also confirmed by the δ18O and δD values in muscovite from greisens (4.2‰–6.5‰ δ18O, –78.8‰ … –84.0‰ δD). The δ18O values calculated in a fluid equilibrated with hydrothermal minerals indicated a meteoric origin.

Highlights

  • The Dzhida ore field is a large Mo–W deposit in Russia (1.4 Mt of WO3 and 1.7 Mt of MoO3 ).It has been studied by many researchers

  • Our study presents stable and radiogenic isotopic data (O, C, D, S, Sr and Nd) in an attempt to better understand the petrogenetic processes and the problem concerning the sources of ore-forming fluids

  • The oxygen and carbon isotopic compositions were analyzed at the Geological Institute of the Siberian Branch of the Russian Academy of Sciences and at the Center for Isotopic Research of the Far

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Summary

Introduction

The Dzhida ore field is a large Mo–W deposit in Russia (1.4 Mt of WO3 and 1.7 Mt of MoO3 ). It has been studied by many researchers. The problem of the sources of ore-forming fluids has not been investigated. Limited complex isotope studies of Mo–W deposits have been carried out in deposits in China [1,2,3,4,5,6], Kazakhstan [7], and Russia [8,9,10]. Our study presents stable and radiogenic isotopic data (O, C, D, S, Sr and Nd) in an attempt to better understand the petrogenetic processes and the problem concerning the sources of ore-forming fluids.

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