低温热年代学在褶皱冲断带中的应用  

Application of low temperature thermochronology in the fold and thrust belt

作　　者：赖红玉 刘丽萍[1] 张永明[1] 张照录[1] LAI Hongyu;LIU Liping;ZHANG Yongming;ZHANG Zhaolu(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255049

出　　处：《山东理工大学学报（自然科学版）》2020年第6期1-7,共7页Journal of Shandong University of Technology:Natural Science Edition

基　　金：国家自然科学基金项目(41703056);山东省自然科学基金项目(ZR2017LD006)。

摘　　要：低温热年代学因其较低的封闭温度(300~40℃),可以反映浅表-上地壳的热事件,在沉积盆地演化、造山带剥露隆升、古地形反演等方面得到广泛应用。褶皱冲断带作为一种复杂的地质构造现象,具有演变形式多样、空间差异明显的特点,其变形构造的启动和定型时间难以准确限定。本文对裂变径迹和(U-Th)/He两种常用低温热年代学体系进行简要介绍,总结了四种利用热年代学数据计算平均隆升-剥露速率的方法,重点阐述当前低温热年代学技术在褶皱冲断带研究中的应用方法:(1)确定断层的性质、活动时间和剥露速率;(2)与平衡剖面技术结合恢复变形发展过程;(3)热-运动学数值模拟。低温热年代学显著提高了对褶皱冲断带形成时间和过程的定量化认识,为探讨或辨别动力学机制提供有力证据。Low temperature thermochronology sensitive to temperature range(300~40℃)can reflect the subsurface-upper crust thermal events,and has been widely used in studying sedimentary basin evolution,orogenic belt exhumation and uplift,paleotopography inversion and other aspects.Fold and thrust belt,a complex geological structure phenomenon,is characterized by various forms of evolution and obvious spatial differences.It is difficult to accurately determine the initiation timing and duration of deformation.In this paper,two low temperature thermochronometers such as fission track dating and(U-Th)/He dating are briefly introduced,and four methods are summarized for calculating average exhumation rate based on thermochronology data.The state of art application of low temperature thermochronology in the study of fold and thrust belt is illustrated,which includes(1)determining the nature,timing and denudation rate of the fault,(2)restoring the deformation evolution in combination with the balanced cross section and(3)performing thermal-kinematic numerical simulation.The low temperature thermochronology can significantly improve the quantitive knowledge of deformation timing and evolution of the fold and thrust belt,which is a robust evidence for discussing and verifying dynamic models.

关 键 词：裂变径迹 (U-Th)/He 褶皱冲断带 平衡剖面技术 Pecube 

分 类 号：P542.2[天文地球—构造地质学] P597.1[天文地球—地质学]