Application of the Gravity and Magnetic Method to the Exploration of the Eastward Extending M-15 Anomaly of the Jinchuan Copper-Nickel Deposit, Gansu Province

• 责任者：Zhang Xiang (No.2 Institute of Geological Exploration for Mineral Resources ; Gansu Bureau of Geology and Mineral Exploration and Development ; Lanzhou 730020 ; China) ; Zhao Xiaoping
• 刊名：Geophysical and Geochemical Exploration
• 出版年：2010
• 卷期：34(2)
• 关键词：铜矿 ; copper ores ; 镍矿 ; nickel ores ; 重力勘探 ; gravity exploration ; 磁法勘探 ; magnetic prospecting ; 甘肃 ; Gansu Province
• 页码：p.139-143
• 图表：7 illus., 2 tables, 5 refs.
• 分类号：1500,1001
• issnNo：ISSN1000-8918
• isbnNo：CN11-1906/P

The M-15 magnetic anomaly（Dongwan anomaly） is a key prognostic area for copper and nickel deposits, to which geologists both in China and abroad have paid close attention. As this anomaly lies in a fully covered area, previous researchers considered it to be caused by an ultrabasic body. Using the gravity and magnetic method to compare it with the magnetic anomaly related to the known Baijiazui ultrabasic body, the authors have reached the following conclusions: The M-15 anomaly is a noncognate gravity and magnetic anomaly characterized by combinational magnetic high and gravity low and a rather large buried depth; the magnetic anomaly might result from the ultrabasic rock below 1 200 m in depth, whereas the gravity low anomaly is probably caused by the Longshoushan Proterozoic basement depression with a buried depth of 1 000 m or so.