line-level: 2" class=MsoNormal>Application of Geochemical Exploration by Pb Isotopes to Deep Ore-Prospecting in the Dashui Gold Deposit of Maqu County, Gansu Province, China

• 责任者：Li Wenjun (Third Institute of Geological and Mineral Exploration ; Gansu Bureau of Geology and Mineral Resources ; Lanzhou 730050 ; China) ; Zhao Caisheng
• 刊名：Geological Bulletin of China
• 出版年：2010
• 卷期：29(9)
• 关键词：金矿 ; gold ores ; 铅同位素 ; lead isotopes ; 同位素测量 ; isotope surveys ; 甘肃 ; Gansu Province
• 页码：p.1338-1348
• 图表：5 illus., 2 tables, 22 refs.
• 分类号：1500
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

Deep prospecting for Dashui gold deposit is the predominant task after exploration and development for 20 years. Geochemical exploration by Pb isotopes is applied in the Dashui gold deposit of Maqu County, Gansu Province, along the typical No.70 and 72 exploration lines, based on previous studies of the Pb isotopes. Based on the regional geochemical background, the cut-off V2 value of mineralization is established in a range of 22.42～34.36, along the No.70 and 72 exploration line at the 3450m elevation, the V2 values are 49.11 and 64.83, respectively. Pb isotope forecast indicate that the cut-off depth of mineralization at No.70 to 72 and westward mineralized district is from 3 000 m to 3 100 m. Thus there is 400～500 m great exploration potential in the depth, which is the focus of future mining exploration and deep exploration work should be strengthened.