Zircon U-Pb Age of the North Da Hinggan Mts. , NE China and Its Constraint to Attribute of the Ergun Block

详细信息   

• 责任者：Biao Shanghu (Institute of Geological Survey of Heilongjiang Province ; Harbin 150036 ; China) ; Zheng Weizheng
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(8)
• 关键词：大地构造 ; tectonics ; 铀—铅计时 ; U-Pb dating ; 大兴安岭 ; Greater Hinggan Mountains
• 页码：p.1262-1272
• 图表：5 illus., 12 refs.
• 分类号：0300
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

///U-Pb ages for various samples from Xinghuaukou rock groups in lulinlinchang and Hanjiayuanzi indicate that the Xinghuadukou rock group and its accompanied metamorphic pluton formed in the Early Proterozoic Tonian period. Migmatization occurs commonly in the Xinhuadukou rock group.  Rock assemblages of the Xinghuadukou rock group, which are exposed in the Medulihe region, is characteristic of graphite-bearing khondalite which can be compared with the Damahe rock of Mahsan rock group and Xindong rock group in eastern Heilongjiang Province. Therefore, the old crystalline basement of the Ergun block was likely located at the Mendulihe district of the Mohe area, and the Xinghuadukou rock group exposed in the southeast was the product of accretion of continental margin during the period from Neoarchean to Paleoproterozoic.