摘要
通过对河南桐柏老湾花岗岩体开展锆石SHRIMP U-Pb测年,获得了一个高精度的U-Pb年龄(132.5±2.4)Ma,比较可靠地限定了老湾花岗岩体的形成时代属于燕山中期,而不是前人所认为的燕山晚期。结合区域构造-岩浆活动时间,认为在燕山中期,桐柏及其邻区存在次比较重要的构造-岩浆事件,老湾花岗岩体是这次构造-岩浆活动事件的产物。
A highly accurate U-Pb age of （132.5± 2.4）Ma was obtained for zircon from the Laowan granite in Tongbai area by using the U-Pb SHRIMP method. It is concluded that the Laowan granite intruded during Middle Yanshanian rather than Late Yanshanian as some researchers have considered. Considering the timing of the regional tectonic-maglnatic activity, the authors hold that there existed an important tectonic-magmatic event during Middle Yanshanian, with the Laowan granite being the product of this event.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2008年第6期519-523,共5页
Acta Petrologica et Mineralogica
基金
全国危机矿山项目200641037)
地质大调查资助项目(1212010733803)
