陈杰
中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029
基金项目: 中央级公益性科研院所基本科研业务专项项目（批准号：IGCEA1417）、国家自然科学基金项目（批准号：41272195）和中国博士后科学基金面上项目（批准号：2013M540997）共同资助
详细信息
作者简介: 覃金堂, 男, 35岁, 副研究员, 释光年代学与地表过程研究, E-mail:jtqin@ies.ac.cn
中图分类号: P597+.3 收稿日期:2018-02-05
修回日期:2018-04-02
刊出日期:2018-05-30
Low-temperature luminescence thermochronology: Basics, recent progress and prospects
Qin Jintang,Chen Jie
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029
MSC: P597+.3
--> Received Date: 05 February 2018
Revised Date: 02 April 2018
Publish Date: 30 May 2018
摘要
摘要:矿物释光信号积累受到随时间变化的辐射剂量和环境温度控制，因此可作为热年代计。释光低温热年代学方法因其封闭温度更低、时间分辨率更高，而成为研究晚第四纪构造变形、地表侵蚀和地貌演化等地表过程最直接的工具之一。文章从矿物释光和地温场演化的基本原理出发，以一维侵蚀剥露和二维地形起伏两种情形为例，阐述了浅部地壳的矿物释光信号如何与地表侵蚀过程相关联，并对业已建立的基于多种释光信号饱和比例约束岩石冷却速率的技术和流程进行了概述；从低封闭温度、高时间分辨率、可提供多种甚至是连续热年代谱的角度对释光低温热年代方法的特点进行了简要介绍，以期促进将该方法更广泛用于地表过程研究的思考。另外，总结了将该方法应用于典型高剥露速率地区而揭示出晚第四纪侵蚀剥露速率时空演化的案例以及方法学的研究进展；以此为基础，讨论了释光低温热年代学方法目前存在的挑战，如对封闭温度概念的澄清、发展原位测量技术以及将释光发光模型与二维或三维地壳热运动模型结合，最终实现利用释光低温热年代学方法重建晚第四纪地表过程。
关键词: 释光/
低温热年代学/
剥露速率/
冷却速率/
封闭温度/
地表过程
Abstract:The accumulation of luminescence signal of mineral is governed by the received radiation and the ambient temperature through time; therefore, the luminescence signal could serve as a kind of thermo-chronometer. The low-temperature luminescence thermochronology(LtLT) is characterized by its low closure temperature and high temporal resolution. It is one of the most direct ways to explore the interactions between the structural deformation and the Earth surface processes, such as erosion and relief change, during the Late Quaternary. In this review, we started by introducing the basic principles for the production of mineral luminescence signal and the evolution of geothermal field. A one-dimension scenario with steady surface erosion and a two-dimension scenario with topographic relief were employed to demonstrate how the geothermal field and various luminescence signals of minerals at depths of the crust responded to the surface processes, such as erosion and relief change. We briefly outlined the established procedure for using the saturation ratios of multiple-luminescence-thermo-chronometer to constrain the rock cooling history. Subsequently, we elaborated the features of the LtLT method from the perspectives of its low closure temperature, high sensitivity to very recent exhumation and high versatility to offer a spectrum of thermo-chronometers with different closure temperatures, and were aiming to stimulate more considerations on how to make the best use of LtLT method to explore various aspects of the Earth surface processes. Then, we showed several case studies, in which the LtLT method was applied to typical sites with high exhumation rates over the world to derive the spatial and temporal changes of erosion rate during the Late Quaternary, which could not be achieved by using other low temperature thermochronology methods. With the brief summary of the progress in application and methodological development, technical challenges for using the LtLT method to reconstruct the surface erosion and relief changes were discussed, which include (1) clarifying the concept of "closure temperature" for the LtLT method, (2) developing the in situ LtLT technique with consideration of the luminescence and dose rate variability across the rock samples, and (3) coupling the luminescence production model with the two-dimension or three-dimension thermo-mechanical model of the crust to retrieve the Earth surface processes during the Late Quaternary.
Key words:luminescence/
low-temperature thermochronology/
exhumation rate/
cooling rate/
closure temperature/
Earth surface processes
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