Application of Mathematical Geological Methods in Huanglong Gold Deposit，Hanyin Area，South Qinling

Ke HAN; Le AN; Xingke YANG; Shuwen LIU

doi:10.11872/j.issn.1005-2518.2019.01.001

Highlights

The South Qinling tectonic belt has formed a huge amount of mineral resources due to its complex tectonic evolution and magmatic activity.The gold ore field in the northern Shiquan-Hanyin area of Shaanxi Province is located in the South Qinling tectonic belt.So far，dozens of gold deposits or gold mineralization points have been discovered in the gold ore field，and the prospecting potential is huge.Huanglong gold deposit is located in the northern Hanyin area.The rocks in the mining area are subject to multi-stage structure deformation and metamorphism，and superimposed with slightly late magmatism.The type of gold mineralization is dominated by altered rock type，followed by quartz vein type.Mineralization is controlled by brittle-ductile shear zone and wall rock alteration. The main alteration types are biotite porphyroblasts crystallization and pyritization，carbonization，garinization，etc.In order to further ascertain the relationship between structure-alteration and mineralization，based on the large-scale （1/5 000~1/10 000） structure-alteration facies mapping in the mining area and the analysis of rock main elements and metallogenic elements，using SPSS17.0 software to carry out Q-type cluster analysis，R-type cluster analysis of main element and metallogenic elements，R-factor analysis for the relationship between ore and structure altered rock,alterated rocks.The results show that the altered rock type gold mineralization is closely related to the faults in the brittle-ductile shear zone and biotite porphyroblasts crystallization alteration；the correlation coefficient between TFe₂O₃ and TiO₂，Al₂O₃ ，K₂O is large，in the field outcrop，it usually can be seen that biotite porphyroblasts crystallization is closely associated with pyritization，gold mineralization often occurs in the biotite porphyroblasts crystallization and pyritization superposition zone；biotite porphyroblasts crystallization，carbonization，pyritization，garinization alteration has high correlation，and its superimposed zone is a favorable part of altered rock type gold mineralization，which should be the product of late hydrothermal alteration stage of regional metamorphism；Au and Cu，Zn，Bi，V，Hg having weak positive correlation shows that gold mineralization may undergo multi-stage hydrothermal superposition and is related to magmatic hydrothermal fluid；three principal component factors F1，F2 and F3 represent the existence of tectonic-hydrothermal action and magmatic hydrothermal action，Au has a certain load on all three factors，which indicates that the formation of gold in the mining area may penetrate the whole process of brittle-ductile shear and magmatism in this area，and the gold mineralization may be superimposed over multiple periods. The next prospecting direction or exploration project layout should prioritized the periphery or the deep of the mining area where brittle-ductile shear zone ，foliated rocks ，the gold-related alteration zone or the alteration superposition well develop，that is the strong structure-hydrothermal activity-water-rock reaction（WRR） concentration site.

Cite this article

Ke HAN , Le AN , Xingke YANG , Shuwen LIU . Application of Mathematical Geological Methods in Huanglong Gold Deposit，Hanyin Area，South Qinling[J]. Gold Science and Technology, 2019 , 27(1) : 1 -14 . DOI: 10.11872/j.issn.1005-2518.2019.01.001

感谢陕西省汉阴黄龙金矿吴玉刚工程师在野外剖面路线调研，平硐、钻孔编录和岩石样品采集工作中给予协助，并衷心感谢审稿专家对本文提出的宝贵修改意见！

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