广东罗浮山断裂^(40)Ar-^(39)Ar年代学及变形期次研究  

Study on^(40)Ar-^(39)Ar Geochronology and Deformation Stages of Luofushan Fault in Guangdong Province

作　　者：许冠军 何斌 杨伟彬 龙桂 XU Guanjun;HE Bin;YANG Weibin;LONG Gui(Guangdong Geological Survey Institute,Guangzhou 510080,China)

机构地区：[1]广东省地质调查院,广州510080

出　　处：《华南地震》2023年第3期130-135,共6页South China Journal of Seismology

基　　金：广东省地质勘查与城市地质专项(2023-15,2022-18)。

摘　　要：广东罗浮山断裂早期韧性变形、晚期脆性变形的特征已有定论,前人多对其变形期次做过定性研究。为了更加精确的研究罗浮山断裂的活动期次,通过对其韧性剪切带内白云母单矿物进行^(40)Ar-^(39)Ar法同位素测年,获得其坪年龄为135.08±0.61 Ma,结果表明:广东罗浮山断裂于早白垩世存在一期重要韧性剪切变形事件。结合前人研究成果,将其活动期次共分为4个阶段:中侏罗世逆冲韧性剪切变形期、早白垩世逆冲韧性剪切变形期、晚白垩世脆性正断、硅化作用期和古近纪-第四纪硅化作用、持续脆性正断变形期。The characteristics of early ductile deformation and late brittle deformation of the Luofushan fault in Guangdong have been determined,and many qualitative studies have been done on the deformation stages.In order to study the active periods of the Luofushan fault more accurately,the^(40)Ar-^(39)Ar isotopic dating of Muscovite single minerals in the ductile shear zone shows that the plateau age is 135.08±0.61 Ma.The results show that there was an important ductile shear deformation event in the Luofushan fault in Guangdong in the Early Cretaceous.Based on the previous research results,the active periods can be divided into four stages:Middle Jurassic ductile shear deformation stage,Early Cretaceous ductile shear deformation stage,Late Cretaceous brittle normal fault stage,silicification stage and Palaeogene-Quaternary silicification stage and continuous brittle normal fault deformation stage.

关 键 词：罗浮山断裂 ^(40)Ar-^(39)Ar年代学 变形期次 

分 类 号：P542[天文地球—构造地质学]