• 责任者：Zhang Jiajing (Northeast Jiangxi Geological Party ; Jiangxi Bureau of Geology and Mineral Exploration and Development ; Shangrao 334000 ; China) ; Shi Guanghai
• 刊名：Acta Geologica Sinica
• 出版年：2009
• 卷期：83(6)
• 关键词：铜矿 ; copper ores ; 多金属矿 ; polymetallic ores ; 火山岩 ; volcanic rocks ; 浙江 ; Zhejiang Province
• 页码：p.791-799
• 图表：7 illus., 2 tables, 40 refs.
• 分类号：1001
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

Copper-polymetal minerals occur in the cracks of the Erhuling Formation rhyolitic ignimbrite in Xujiadun, Jiangshan District, Zhejiang Province, but the origin and age of rhyolitic ignimbrite are still unclear. Based on the field observation, it is pink in color and of rhyotaxitic and porphyritic structures. REE geochemical analysis shows high negative Eu abnormalities (δEu=0. 028～0. 038)with a “seagull-shaped” distribution in REE patterns. Petrography and geochemical characteristics indicate that the rhyolitic ignimbrite is of A-type granite, suggesting it formed in an intraplate structural environment. SHRIMP zircon U-Pb dating yields an erupting age of  (138.0±2.4) Ma, indicating that the volcanic rocks likely emplaced at the middle-late stage of Yanshanian movement during the Mesozoic Era.