摘要
长乐—南澳构造带是福建东部一条至关重要的构造带,近年来,在带中多处发现辉长岩质和二长花岗质岩浆经机械、化学的混合作用形成各种岩浆混合岩。通过对东庄岩体二长花岗岩和辉长闪长岩进行高精度LA-ICP-MS锆石U-Pb测年,获得二者年龄分别为(110.8±0.5)Ma、(105.2±0.9)Ma,为东庄岩体岩浆混合成因提供了年代学证据。东庄岩浆混合岩与石帽山群双峰式火山岩的岩石组合相似,形成时代相同,是该时期岩浆活动的2种不同表现方式,形成于活动大陆边缘的后造山伸展构造环境。
Gabbro and admellite granitic magma have been found in various parts of the belt to form various magmatic mixed rocks through mechanical and chemical mixing.In this paper,the high-precision LA-ICP-MS zircon U-Pb dating of the Dongzhuang rock mass monzonite and diorite is obtained,and the ages are(110.8±0.5)Ma and(105.2±0.9)Ma,respectively.The geologic mixing causes provide chronological evidence.The rock combination of the Dongzhuang magmatic mixed rock and the Shifengshan group’s bimodal volcanic rocks is similar and formed in the same era.They are two different manifestations of magmatic activity during this period,which are formed in the extended tectonic setting of the active continental margin.
作者
许仙斌
Xu XianBin(Fujian Institute of Geology Survey and Research,Fuzhou,350013)
出处
《福建地质》
2019年第4期248-262,共15页
Geology of Fujian
基金
中国地质调查局项目“闽台中生代构造-岩浆区区域地质专项调查”(编码:12120114043301).
