LA-ICP-MS Zircon U-Pb Dating of the Dacite Porphyry from Zijinshan Cu-Au Deposit and its Metallogenetic Implications

详细信息   

• 责任者：Hu Chunjie (Key Laboratory for Mineralogy and Metallogeney ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Huang Wenting
• 刊名：Geotectonica et Metallogenia
• 出版年：2012
• 卷期：36(2)
• 关键词：多金属矿 ; polymetallic ores ; 英安岩 ; dacites ; 玢岩 ; porphyrite ; 福建 ; Fujian Province
• 页码：p.284-292
• 图表：5 illus., 33 tables, 2 refs.
• 分类号：1001
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

摘要

The dacite porphyry occurs in the volcanic caldera of Zijinshan ore field and closely associates with the Cu-Au mineralization. The LA-ICP-MS zircon U-Pb dating of two dacite porphyry samples yields weighted mean ages of （ 105.0 ± 0.7 ） Ma and （ 105.0 ± 2.2） Ma, respectively. These results suggest that the dacite porphyry was formed proximately contemporarily with the other two Mo and Cu mineralized granite porphyries, i. e. , the Sifang and Luoboling granite porphyries. The dacite and granite intrusives are characterized by high Ce^4＋/Ce^3＋ ratios, which indicates that the magmatic system was of oxidative and therefore consistent with the huge Cu-Mo-Au oreforming potential of the dacite and granite porphyries.