Abstract
In this paper, fluid inclusions and H-O-S isotope geochemistry of the Chambishi copper deposit in Zambia are studied. According to the fluid inclusion in quartz and H-O-S isotope characteristics, it is concluded that ore-forming hydrothermal fluid is derived from mantle source and crust source magma mingling, the cause of copper precipitation, sedimentary type sulfur layered mineralization are mainly from diagenetic sulfides and seawater sulfate. Sulfate is mainly reduced by thermochemical method. The hydrothermal vein mineralization of Chambishi copper deposit is closely related to the magmatic activity in the middle Neoproterozoic, and the sedimentary stratified mineralization is mainly related to the large-scale orogeny and regional metamorphism in the late Neoproterozoic.
Highlights
Sedimentary copper deposits are an important source of copper, and the Central African copper belt is the highest grade and largest copper deposit in the world
Through the observation of the petrographic characteristics of fluid inclusions, it is found that the fluid inclusions of ore-bearing vein with hydrothermal filling vein mineralization are of different shapes and sizes, with the largest being up to 20 μm and the smallest being about 1 μm
Hydrothermal stage of microscopic characteristics of fluid inclusions shows that type I, II, III inclusions have no close coexist in the same horizon (Fig. 1), the micro measurement results show that the main metallogenic stage I type inclusions homogenization temperature are mainly distributed in the low temperature range, in the uniform temperature and salinity diagram, the salinity of the fluid inclusions and uniform temperature range is larger, these features indicate fluid mixing
Summary
Sedimentary copper deposits are an important source of copper, and the Central African copper belt is the highest grade and largest copper deposit in the world. Previous studies have been carried out on the basic geological characteristics, ore-bearing structures, mineralization types, orecontrolling structures, prospecting prospects and prospecting marks of Chambishi copper deposit, and abundant results have been obtained. The study on fluid inclusions and H-O-S isotope geochemistry of Chambishi copper deposit is still weak, and the study on the relationship between fluid evolution and mineralization is seldom involved, which is not beneficial to the correct understanding of the ore-forming fluid properties and the source of oreforming materials of Chambishi copper deposit. In this paper, the analysis of the ore-bearing vein fluid inclusions and chalcopyrite/bornite sulfur isotopes in Chambishi copper deposit is helpful to reveal the properties of ore-forming fluids and trace the source of ore-forming materials, providing a new basis for the correct understanding of the origin of Chambishi copper deposit
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