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Gold Science and Technology ›› 2016, Vol. 24 ›› Issue (4): 1-9.doi: 10.11872/j.issn.1005-2518.2016.04.001

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The Morphological and Chemical Characteristics of Gold Minerals and Their Ore Genetic Significances in Xinshan Gold Deposit，Yunnan Province

ZHANG Shugen1，2， LIU Xuan1，2，LIU Chunbo1，2，HUANG Chaowen1，2   

  1. 1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals，Ministry of Education，Central South University，Changsha   410083，Hunan，China；
    2.School of Geoscience and Info-Physics，Central South University，Changsha   410083，Hunan，China
  • Received:2016-06-28 Revised:2016-07-22 Online:2016-08-28 Published:2016-11-17

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Abstract:

By use of the optical microscope and electronic probe as main tools，this paper focused on the morphology，chemical composition，occurrences of gold minerals in the primary gold ores in Xinshan gold deposit in Yunnan Province，and their ore genetic significances was discussed in association with geological and mineralizing conditions.The results show that the gold minerals belong to Au-Ag solid solution series in which minor mercury and bismuth incorporated.In this solid solution series，electrum is the dominant species，argentiferous native gold in the second proportion and native gold is minor species.Pyrite is the dominant gold carrier mineral，and the occurrence of gold minerals is observed included gold，fissure-filled gold and intergranular gold.As the hydrothermal gold mineralizing process developed，affected mainly by the gentle decrease of fluid temperature and acidity and weak and ajusting activity of ore-controlling fault，gold minerals crystallized orderly as native gold at first，then argentiferous native gold and electrum finally，and following this order，their occurrence changed orderly as included，fissure-filled and intergranular gold.The chemical composition，occurrences and their variation regularities suggest Xinshan gold deposit is mesothermal deposit and there is prospecting potentiality at the unexplored deeper part of the minig area.

Key words: gold minerals, chemical composition, occurrence, genesis, Xinshan gold deposit, Yunnan Province

CLC Number: 

  • P618.51

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