Phanerozoic magmatic events in the basement of Songliao basin: SHRIMP dating of captured zircons from Yingcheng Formation volcanic rocks

作者：Yu Xing^*; Xiao Jun; Chen HanLin; Zhang FengQi; Xu Yan; Dong ChuanWan; Pang YanMing

来源：Acta Petrologica Sinica, 2008, 24(5): 1123-1130.

• Songliao basin
• captured zircons
• SHRIMP U-Pb dating
• Phanerozoic basement
• magmatic events

Basement research to a basin is of great importance to know the basin genesis and rebuild the paleo-tectonic setting. This paper is trying to study the captured Phanerozoic zircons in Early Cretaceous YingCheng Formation volcanic rocks by SHRIMP U-Pb dating. There are 7 age groups for the captured zircons: 482 similar to 481 Ma, 381 similar to 350Ma, 297 similar to 290Ma, 252 similar to 237Ma, 225 similar to 219Ma, 200 similar to 189Ma, 183 similar to 158Ma, which means there happened large scale magmatic events in Late Devonian, Early Permian, Triassic and Early-Middle Jurassic. Among them Triassic and Jurassic magmatic rocks compose the main part of Phanerozoic base granitoid rocks. These Phanerozoic magmatism is quite possibly related to paleo-tectonic movements, such as lithophere extention following the collision of the Ergula-Xing' an, Songnen-Zhangguangcailing and Jiamusi-Xingkai block during Late Paleozoic, and lithosphere extention following the collision between North China Block and Siberia Block in Late Permian, and Combination of Jiamusi and Songnen block in Jurassic, as well as the transition of tectonic domain from Paleo-Asia Ocean to Pacific. Besides, 482 - 481 Ma is the age for a metamorphic captured zircon, which indicates the metamorphism happened in the basement of Songliao basin around Early Ordovician. And that was probably influenced by the collision of Ergula and Xing' an Block which was near to the basin.

• 出版日期2008-5
• 单位浙江大学