SHRIMP U-Pb Zircon Dating for Granodiorite Porphyry of the Fengshan Orefield in Eastern Hubei Province and Its Geological Significance
详细信息
- 责任者：Chen Fuwen (Yichang Institute of Geology and Mineral Resources ; MLR ; Yichang 443005 ; China) ; Mei Yuping
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(1)
- 关键词：花岗闪长斑岩 ; granodiorite porphyry ; 多金属矿 ; polymetallic ores ; 铀—铅计时 ; U-Pb dating ; 长江中下游成矿带 ; Metallogenic Belt of Middle and Lower Reaches of Yangtze River
- 页码：p.88-96
- 图表：7 illus., 2 tables, 37 refs.
- 分类号：0801
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
As an important part of the polymetallogenic belt on the middle-lower reaches of the Yangtze River, the Fengshan orefield consists of large-medium-sized Cu-Au polymetallogenic deposits, distributed in Jilongshan, Fengshan, and Lijiawan. Orebodies occur within the contact zones of granodiorite porphyry with Triassic carbonate, and the mineralization was closely related to the Yanshanian granodiorite porphyry. The results are consistent with the molybdenite Re-Os isochron age (140 Ma±) of typical Cu-Au-Mo-(W) deposits in the southeastern deposit-intensive region,indicating that the diagenesis and metallogeny events of the Fengshan orefield happened in Early Cretaceous. The study also obtained the age of Neoproterozic zircon from the Jilongshan granodiorite porphyry, and this provides evidence for existence of the Neo-Archean-palaeo-Proterozoic crystalline basement in the northern margin of the Yangtze massif.