North Qinling Luohansi Rock Group SHRIMP U-Pb Zircon Age and Its Tectonic Significance
详细信息
- 责任者：Cui Jiantang (Shaanxi Institute of Geological Survey ; Xi’an 710065 ; Chian) ; Han Fanglin
- 刊名：Northwestern Geology
- 出版年：2011
- 卷期：44(4)
- 关键词：岩墙群 ; dyke swarms ; 铀—铅计时 ; U-Pb dating ; 秦岭 ; Qinling Mountains
- 页码：p.8-14
- 图表：4 illus., 1 table, 10 refs.
- 分类号：0801
- issnNo：ISSN1009-6248
- isbnNo：CN61-1149/P
摘要
The paper presents SHRIMP U-Pb dating results of zircon from south Luohansi group(the sediment wedge of forearc basin), cropping out from the north Qinling to Heihe River Xiaowangjian Huangcaoping. The age of crystal tuff obtained was 491±5 Ma. The obtained age indicates that this group is through Ordovician. Combined to granite belt of Caledonian stage widely grown in northern side of Shangdan belt, and the newest age information measured by predecessors in other places, the important evidence of isotopes chronology was offered to subduction of northern Qinling Paleozoic Oceanic basin and plate convergence.