基于测年法的永安石林形成年代及发育演化过程研究  

On the formation age and developing process of Yong'an stone forest

作　　者：池永翔[1,2] 李润[3] 陈植华[1] 

机构地区：[1]中国地质大学环境学院,湖北武汉430074 [2]福建省地质调查研究院,福建福州350001 [3]福州大学环境与资源学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2011年第1期152-156,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：中国石林地质地貌对比研究资助项目

摘　　要：以永安石林地区地质、水文地质资料为背景,利用不平衡铀系法,对区内不同高程的钙华沉积物岩样进行年龄测定,确定了永安石林形成年代为中更新世以来,距今约50万年.结合区域地质构造历史及沙溪河谷地貌发育演化过程,认为:永安石林的形成始于早更新世;主要是因地壳间歇性抬升运动且大湖盆地开始处于剥蚀环境,石炭二叠纪碳酸盐岩的上覆岩层逐渐被风化剥蚀后形成.Under the background of geological and hydrogeological data in Yong＇ an stone forest, Uranium - series disequilibrium method is introduced in this paper to mensurate the age for eale - sinter rock samples at different heights, so the formation age of Yong＇ an stone forest is confirmed, that is, about 500 thousand years since Medio -Pleistocene. Combined with history of regional geological structure and evolvement process of Shaxi valley form, this paper concludes, Yong＇ an stone forest is formed during Early Pleistocene, its formation is resulted from intermittent uplift movement of the earth＇ s crust as well as gradual weathering and erosion of the carbonate rock overlying on carboniferous and Permian under the denudation environment of Dahu basin.

关 键 词：永安石林 测年 形成年代 发育演化过程 

分 类 号：P56[天文地球—构造地质学]