摘要
通过最新锆石SHRIMP U-Pb测年,获得了南华山花岗闪长岩3组新的同位素测年资料,即乱堆子岩体、油房院岩体、石洼里岩体的形成年龄分别为(431±5)Ma,451+54-32Ma,(437±5)Ma.认为这3个岩体均为加里东构造运动的产物,具成因联系,属同一个岩浆序列.其中,油房院岩体侵位略早,形成时代为晚奥陶世,乱堆子岩体和石洼里岩体侵位较晚,形成于早志留纪.
Using SHRIMP U-Pb zircon dating, three groups of new data of isotopic age were obtained. The formation age of Luanduizi granodiorite is （431±5）Ma; the formation age of Youfangyuan granodiorite is 451＋54-32 Ma; the formation age of Shiwali granodiorite is （437±5）Ma. It can be concluded that these three rock masses are the products of the Caledonian tectonic movement, there are genesis relationship of them, and they belong to the same magmatic sequence. Youfangyuan granodiorite emplaced slightly earlier and formed in the Late Ordovician, Luanduizi granodiorite and Shiwali granodiorite emplaced slightly later and formed in the early Silurian.
出处
《宁夏工程技术》
CAS
2012年第4期293-296,共4页
Ningxia Engineering Technology
