Shrimp Zircon U-Pb Ages of Rhyolite from the Naij Tal Group in the East Kulun Orogenic Belt

• 责任者：Zhang Yaoling (China University of Geosciences ; Beijing 100083 ; China) ; Zhang Xujiao
• 刊名：Journal of Geomechanics
• 出版年：2010
• 卷期：16(1)
• 关键词：流纹岩 ; rhyolites ; 铀—铅计时 ; U-Pb dating ; 昆仑山 ; Kunlun Mountains
• 页码：p.21-27
• 图表：3 illus., 2 tables, 15 refs.
• 分类号：0801,1300
• issnNo：ISSN1006-6616
• isbnNo：CN11-3672/P

The Naij Tal Group is a major lithostratigraphic unit with a complex composition in the East Kunlun Paleozoic orogenic belt, and there has long been debated on its formation time. An average SHRIMP zircon ²⁰⁶Pb /²³⁸U age of (450.4 ± 4.3) Ma has been obtained for 15 rhyolite samples collected from the Shihuichang Formation of the Naij Tal Group south of Gelmud. It was interpreted as the age of a volcanic activity, so the Shihuichang Formation of the Naij Tal Group can be considered to form in the Late Ordovician.