• 责任者：Bai Fengjun (School of Geosciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Xiao Rongge
• 刊名：Geology and Prospecting
• 出版年：2009
• 卷期：45(4)
• 关键词：钼矿 ; molybdenum ores ; 石英脉型矿床 ; quartz veins type deposit ; 河南 ; Henan Province
• 页码：p.335-342
• 图表：6 illus., 4 tables, 17 refs.
• 分类号：1003
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

///The K-feldspar-quartz vein type molybdenum deposits in Songxian County of Henan Province occurred along the volcanic rock strata of the Xiong’er Group of Middle Proterozoic. They appear stratiform-like, lenticular, parallel and dense, and have a conformable contact with wall rocks. Banded alteration halos developed at both sides of these mineralized quartz veins. Molybdenum mineralization usually occurs with k-silicate (K-feldspar) alteration, strong silicification and pyritization. Alteration and mineralization become weaker with the distance farther from quartz veins. Quartz veins are formed in three stages. The quartz veins formed in early stage were not mineralized. The quartz veins formed in middle stage produce quartz vein-type ores containing molybdenite, pyrite, chalcopyrite, galena and sphalerite. The ones of late stage are small quartz-carbonate veins without mineralization. The geochemical characteristics of quartz veins of three stages are analyzed respectively. The rare earth elements distribution pattern and trace element contents of ore-bearing quartz veins and barren quartz veins are different. It shows that the fluid differentiated during mobilization and evolution process. Fluid inclusions in ore-bearing quartz veins show high salinity and rich in CO₂ that might indicate the boiling and immiscibility of ore-forming fluids, at pressure varying between 28×10⁵～68×10⁵ Pa. The Ar/K age of mineralized quartz veins is about 1352.95±27.06 Ma. It is concluded that the molybdenum mineralization in Songxian is mesothermal to hypothermal deposits related with volcanic-magmatic fluids, which fill the fissures among the strata near the crater and volcanic edifice, and alteration halos developed by metasomatism between fluid and host rocks.