• 责任者：Li Jiankang (Key Laboratory of MetaUogeny and Mineral Resource Assessment ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wang Denghong
• 刊名：Earth Science
• 出版年：2013
• 卷期：38(5)
• 关键词：钨矿 ; tungsten ores ; 云南 ; Yunnan Province
• 页码：p.1023-1036
• 图表：8 illus., 6 tables, 34 refs.
• 分类号：1001
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

     The Laojunshan ore concentration area,containing many tungsten deposits of Nanyangtian,Huashitou and Chayeshan,is one of the few tungsten concentration areas in the western Nanling metallogenic belt.But,its regional ore-forming ages are controversial due to multi-stage tectono-thermal events.In this paper,the scheelite Sm-Nd dating method was used to determine the ore-forming age of the feldspar quartz vein type ore bodies in the Nanyangtian ore field,and the muscovite and biotite Ar-Ar dating method were used to determine the crystallization ages of the regional granitic pegmatites and the metamorphic age of their wall rocks respectively.The dating results show that the feldspar quartz veins type ore bodies formed at 159± 14Ma,younger than the skarn type ore bodies,and the pegmatite crystallization ages and the wall rocks metamorphic ages are 144-141Ma and 121-112Ma respectively.So the Late Jurassic-Early Cretaceous tectono-thermal event and tungsten mineralization occurred in Laojunshan area.The metallogenic regularity in the Laojunshan areas illustrates that the regional ore deposits or spots are constrained by the regional granite gneiss and granitic intrusion,and the ore-forming period is consistent with the three ore-forming peaks in the Nanling minerallenic belt.Furthermore,the mineralization features in Laojunshan area are similar with that in the eastern Nanling metallogenic belt,which may be due to the high denudation degree.It is concluded that the great denudation area in the western Nanling region has great potential to find tungsten deposit formed in Late Triassic and Indo-Chinese and Late Jurassic-Early Cretaceous.