地质通报Issue(1)：175-180,6.
皖南屯溪地区石岭组流纹岩LA-ICP-MS锆石U-Pb年龄及其时代的重新厘定
摘要
Abstract
The Tunxi area in south Anhui Province is located in the eastern segment of the Jiangnan Neoproterozoic Orogen and possesses some volcanic rocks of Shiling Formation like rhyolite and tuff. Based on the K-Ar age 115~139Ma by 1∶50000 regional geological survey, previous studies believed that these volcanic rocks of Shiling Formation from Tunxi area were formed during Late Jurassic to Early Cretaceous. Owing to the change of the Jurassic-Cretaceous boundary from 135Ma to 145Ma (revised by Interna⁃tional Commission on Stratigraphy), the Shiling Formation has thus changed its formation epoch from Late Jurassic-Early Cretaceous to Early Cretaceous. The authors obtained LA-ICP-MS zircon U-Pb weighted average age of 154.7 ± 2.5Ma for the rhyolite from Youxi Village, east Tunxi (D047), south Anhui Province, implying that the volcanic rocks of Shiling Formation was formed in Late Jurassic (older than 145Ma), rather then in Eearly Cretaceous. This precise datum is valuable for a better understanding of tectono-magmatic evolution of south Anhui and even southeast China.关键词
LA-ICP-MS锆石U-Pb测年/晚侏罗世/石岭组火山岩/皖南屯溪地区Key words
LA-ICP-MS zircon U-Pb dating/Late Jurassic/volcanic rocks of Shiling Formation/Tunxi area, south Anhui分类
天文与地球科学引用本文复制引用
余心起,陈子微,刘秀,姬祥,周术召,杨鑫朋..皖南屯溪地区石岭组流纹岩LA-ICP-MS锆石U-Pb年龄及其时代的重新厘定[J].地质通报,2016,(1):175-180,6.基金项目
国家自然科学基金项目 （）
