摘要
在北祁连西段三岔口等6幅1∶5万区域地质调查中,对祁青构造混杂岩进行了调查研究,通过LA-ICPMS法单颗粒锆石U-Pb同位素测年,获得206Pb/238U表面加权平均年龄494±15Ma,相当于中寒武世,故将该混杂岩解体,部分归为中寒武世黑刺沟组。
Petrological and geochemical characteristics as well as formation ages of the Qiqing tectonic melange belt were investigated during the regional geological survey（scale 1：50000） in Sanchakou 6 maps etc, the west sector of the northern Qilian Mountains. By LA-ICPMS isotopic age determination, getting the average age of206 Pb /238 U surface weighted 494 ±15Ma, equivalent to the Middle Cambrian. So will the Qiqing tectonic melange belt disintegration, part to Middle Cambrian Heicigou group.
出处
《甘肃地质》
2014年第3期9-14,共6页
Gansu Geology
基金
北祁连西段三岔口等6幅1:5万区域地质调查项目部分成果
关键词
北祁连西段
祁青构造混杂岩
单颗粒锆石U-PB年龄
中寒武世黑刺沟组
the west sector of northern Qilian Mountain
Qiqing tectonic melange belt
single-grain zircon U-Pb dating
Heicigou Group
