Zricon U-Pb Age, Geochemical Characteristics and Petrogenesis of the Yixian Formation Volcanic Rocks in Jianchang, Western Liaoning Province
详细信息
- 责任者：Feng Guangying (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Liu Shen
- 刊名：Acta Mineralogica Sinica
- 出版年：2011
- 卷期：31(3)
- 关键词：碱性岩 ; alkali rocks ; 粗面岩 ; trachyte ; 铀—铅计时 ; U-Pb dating ; 辽宁 ; Liaoning Province
- 页码：p.380-390
- 图表：5 illus., 3 tables, 48 refs.
- 分类号：0801
- 出版序号：167
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
Volcanic rocks are widespread in western Liaoning province. The studied alkaline trachytes are located at the top of the Yixian Formation volcanic rocks in Jianchang. Systemic studies on chronology and geochemistry indicate that the volcanic rocks were formed in (120.3±1.5) Ma (zircon LA-ICP-MS U-Pb age). Based on the studied evidence, the authors propose that the volcanic rocks were derived by underplating of mantle-derived magma, contamination of lower crust, partial mantling and then erupt to the earth along the deep and big fracture. At the same time, the volcanic rocks underwent intensive olivine, orthopyroxene and clinopyxene fractional crystallization before crystallization.