Geochronology, Geochemistry and Geological Implications of the Mengku Synorogenic Plagiogranite Pluton in Altay, Xinjiang

详细信息   

• 责任者：Yang Fuquan (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Mao Jingwen
• 刊名：Acta Geologica Sinica
• 出版年：2008
• 卷期：82(4)
• 关键词：斜长花岗岩 ; plagiogranite ; 同位素年龄 ; isotope age ; 新疆 ; Xinjiang
• 页码：p.485-499
• 图表：12 illus., 3 tables, 66 refs.
• 分类号：0801
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

SHRIMP-U-Pb zircon dating on the Mengku plagiogranite pluton in the Mengku iron deposit district in Xinjiang shows that it was formed at 400±6 Ma (MSDW=1.3).This age is similar to that of biotite granite at the north part of the No.1 orebody (SHRIMP-U-Pb dating is 404±8 Ma); indicating that they were formed at the beginning of the Early Devonian. These plutons intrude into the Kangbutiebao Formation, showing that Kangbutiebao Formation could have been much earlier than 404 Ma. The Mengku iron deposit is related to magmatic hydrothermal activity, and the ages of the plutons shows that iron mineralization formed in slightly later than 404-400 Ma.