- 责任者：Tan Hongyan (China University of Geosciences ; Beijing 100083 ; China) ; Wang Daodong
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2013
- 卷期：32(5)
- 关键词：斑岩钼矿床 ; porphyry molybdenum deposit ; 小兴安岭 ; Xiao Hinggan Mountains
- 页码：p.733-750
- 图表：11 illus., 7 tables, 26 refs.
- 分类号：1001
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
The Huojihe molybdenum deposit in the Xiao Hinggan metallogenic belt is a large porphyry deposit discovered in recent years. Based on the analysis of characteristics of mineralization, the authors conducted the LA-ICP-MS U-Pb dating of zircon from metallogenic granitic complex and Re-Os dating of molybdenite in Huo- jihe area. LA-ICP-MS U-Pb ages of zircons from medium-fine grained granodiorite and porphyritic granite are 181.0 ± 1.9 Ma （ n = 15, MSWD = 4.7） and 193.6 ± 1.4 Ma respectively, The molybdenite Re-Os isochrones age is 176.3 ± 5.1 ]Via （ n = 6, MSWD = 1.3）, with weighted average model age of 181.2±1.8 Ma. The ages from the two methods are close to each other, suggesting that they might have been formed in the same petroge- netic ore-forming system. The petrogenesis started at 193.6 -＋ 1.4 Ma and the mineralization in the magma oc- curred at 181.2 ＋ 1.8 Ma. The ore-forming age of the Huojihe molybdenum deposit is close to the molybdenite Re-Os isochron age of the Wunugetu Cu-Mo deposit and the Lanjiagou and Yangjiazhangzi molybdenum deposits. There existed an early Jurassic magmatic-mineralization event in Northeast China, Trace dement and isotope show that granodiorite and porphyritic granite in Huojihe belong to A-type granites. Petrogenesis and mineralization of Huojihe molybdenum deposit were related to changes of the tectonic environment from crust extruding to ex- tending. The mineral murce was derived from magma.