Permian Crustal Extensional Thinning in the the South Margine of Aitay Mountians: Evidence from Intrusive Rocks
详细信息
- 责任者：Liu Weiguo (No.1 Regional Geological Survery Team ; Xinjiang Bureau of Geology and Mineral Resources Development ; Urumqi 830011 ; China) ; Han Jingbo
- 刊名：Xinjiang Geology
- 出版年：2011
- 卷期：29(3)
- 关键词：侵入体 ; intrusions ; 地壳减薄 ; crustal thinning ; 阿尔泰山 ; Altai Mountains
- 页码：p.270-274
- 图表：illus., 1 table, 8 refs.
- 分类号：0801
- issnNo：ISSN1000-8845
- isbnNo：CN65-1092/P
摘要
A series of norite-syenite occur on Wuxiagou the south margin of Altai Mountians. The contents of SiO2 rang from 46.91% to 50.75%. SHRIMP U-Pb Zircon dating of the norite yeild (275±1) Ma, and they are proved that they formed in the Permian tensional structural enciroment. A series of alkali-rich intrusion occur on Chinese Aitay orogen. This pluton is composed of syenite with quartz monzonite, quartz alkali-feldspar syenite and syenogranite. The Zircon U-Pb dating yield a 206Pb /238Pb age of (286±1) Ma. The alkali-rich intrusive rocks setted in A2 type in the Rb/Nb-Y/Nb diagram, this pluton is post orogenic. The dyke and alkali-rich intrusive rocks were the record of crustal extensional thinning at Permian.