Typomorphic Characters and Significance of Pyrite in a Greenstone Belt Type Gold Deposit in Tanzania
Received date: 2018-01-16
Revised date: 2018-10-31
Online published: 2019-03-19
The greenstone belt around Victoria Lake in Northwest Tanzania is one of the world famous gold metallogenic belts,but its overall research level is relatively low,especially lack of research on major gold-bearing minerals.Pyrite is mainly connectivity gold-bearing mineral in gold deposit,through observing,analyzing and studying the typomorphic characteristics such as morphology,chemical composition and physical properties of pyrite in greenstone belt type gold deposits around Victoria Lake in Tanzania,the organic relationship between typomorphic characteristics and gold grade is found out and applied to the field gold exploration.It is helpful for geologists to distinguish the characteristics of gold-bearing ore bodies in time and accurately,and it has an important guiding significance for field exploration to some extent recognition gold ore body.In this paper,the typomorphic characteristics of pyrite in the greenstone belt type gold deposit have been studied in detail by means of field observation,microscopic observation,electron probe analysis and ICP-MS.The results show that the pyrite in the deposit is light yellow-yellow,mainly fine particles and it has best gold-bearing for pyrite with subhedral and cataclastic structure.It is mainly composed of pentagonal dodecahedron,pentagonal dodecahedron and other monomorphic polygons in the main ore body which gold mineralization is strong.The S/Fe average value of pyrite in the main metallogenic period is 1.96,and it shows that the characteristics of the main content elements of pyrite in the main metallogenic stage,with deficient S and rich Fe as a whole,and showing the sulfur fugacity of the hydrothermal system in the main metallogenic period is low,while the trace elements are rich in As and Sb,which is positively correlated with the content of Au element.It shows that these elements displace S element in pyrite and form P-type pyrite with better gold-carrying capacity.Pyroelectricity of pyrite near the main ore body is P-type pyrite,it mainly shows the lower denudation extent of overall gold vein,and the exposed vein is only shallow,and there is still a large extension to the deep of the vein,thus it has a good prospecting for deep.
Qingwei LUO , Baoguo WANG , Aiwen YI , Kechuan ZHANG , Ze PAN , Shengya ZHANG . Typomorphic Characters and Significance of Pyrite in a Greenstone Belt Type Gold Deposit in Tanzania[J]. Gold Science and Technology, 2019 , 27(1) : 15 -24 . DOI: 10.11872/j.issn.1005-2518.2019.01.015
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