标题:
粤西德庆岩体地质特征及其锆石LA-ICP-MS年龄Geological Characteristics and LA-ICP-MS Zircon U-Pb Dating of Deqing Pluton, West Guangdong Province
作者:
张献河, 严成文, 李宏卫, 李出安
关键字:
德庆岩体, 地质特征, LA-ICP-MS锆石U-Pb测年, 粤西Deqing Pluton, Geological Characteristics, LA-ICP-MS Zircon U-Pb Dating, West Guangdong Province
期刊名称:
《Advances in Geosciences》, Vol.5 No.3, 2015-06-29
摘要:
德庆岩体是粤西主要的深成岩体，其主体岩石岩性为中粒含斑黑云母二长花岗岩，属于硅过饱和，铝过饱和的钙碱性花岗岩类。本文使用LA-ICP-MS锆石U-Pb测年方法获得花岗岩体主体成岩结晶年龄为237.1 ± 3.4 Ma，属于印支期岩浆活动的产物。形成于板块间同碰撞的构造环境，与区域内云开地区印支期同碰撞造山作用有关。Deqing pluton is one of the main plutons located in western part of Guangdong Province. Its main lithology is middle-grained (porphyritic) biotite monzogranite and it is calc-alkali granite that is rich in SiO2 and Al2O3. This study used LA-ICP-MS zircon U-Pb dating method and the result shows that the age of crystallization of the Deqing pluton is about 237.1 ± 3.4 Ma, belonging to the product of Indosinian magmatism, and its genesis is closely related to syn-collision tectonic background in Yunkai area during Indosinian movement.