Typomorphic characteristics and geological significance of pyrite from No.1 deposit in the Xiongcun district,Tibet
In order to study the genetic mineralogy and prospecting significance of pyrites in the Xiongcun deposit in Tibet,the thermoelectric analysis,X-ray fluorescence diffraction analysis,electron microprobe analysis,and LA-ICP-MS analysis of pyrites from the No.1 orebody of the Xiongcun deposit have been carried out in this paper.The results display that pyrites in the No.1 orebody of the deposit have unit cell parameters varying form 5.41438×10-10 m to 5.41966×10-10 m(average 5.417 47×10-10 m),volumes varying form 158.7190×10-10 m3 to 159.1946×10-10 m3(with the average ∆V of 158.9896×10-10 m3),thermoelectric coefficients varying form-336.7 to 330.6 μV/℃,S contents of 51.34%～53.44%(average of 52.92%),Fe contents of 44.06%～46.90%(average of 46.18%),and Co/Ni ratios of about 10.Combined with previous research results,it is believed that pyrites of the main mineralization stage in the No.1 orebody mainly belong to the N-type pyrite.They are of magmatic hydrothermal origin and were formed in the medium to high temperature environment with relatively low sulfur fugacity.In addition,the pyrite is not the main gold-bearing mineral in the No.1 orebody.It is predicted that the No.1 orebody is in the middle-lower part of the original ore-forming system.There could be a certain extension trend of the orebody in the depth.However,the deep part of No.1 orebody was more likely to have been destroyed by the later emplaced biotite granodiorite.Therefore,there is a relatively low prospecting potential of mineral resources in the depth of No.1 orebody.
Xiongcun deposit in Xizangpyritecell parameterthermoelectricporphyry deposit
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