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地球科学进展  2010, Vol. 25 Issue (4): 418-427    DOI: 10.11867/j.issn.1001-8166.2010.04.0418
“土地利用/覆盖变化与综合减灾”专辑     
(U-Th)/He测年技术:α离子射出效应及其校正
常远,许长海,周祖翼
同济大学海洋地质国家重点实验室,上海  200092
(U-Th)/He Dating Method: α-ejection Influence and Correction
Chang Yuan, Xu Changhai, Zhou Zuyi
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(2111 KB)  
摘要:

(U-Th)/He测年技术是近年来低温热年代学研究领域快速发展的一个重要分支,被应用于磷灰石、锆石、榍石、石榴子石等多种矿物,并且磷灰石(U-Th)/He在目前已知的所用低温热年代学指标中具有最低的封闭温度和较强的热敏感性,此外矿物的(U-Th)/He分析还可用来反演样品所经历的热历史,因此该技术在地质学中得到了广泛的应用。随着对(U-Th)/He方法研究程度的提高,影响测年结果的各种因素也被相继发现和认识。从(U-Th)/He测年的基本原理出发,详细介绍了矿物内α离子的射出效应及其对氦年龄计算的影响与校正,进一步说明了矿物成分环带、晶体形状、比表面积等因素对于氦年龄校正的作用,并详细阐述了已有的针对这些因素的不同校正模型的原理、特点、发展历程以及前缘研究方向。

关键词: (U-Th)/He测年低温热年代学α离子射出效应矿物环带    
Abstract:

The recently developed (U-Th)/He dating method is one of the important low-temperature thermochronometers and widely used by apatite, zircon, titanite, garnet, et al. in geosciences. The apatite (U-Th)/He has the lowest closure temperature among the known geo-thermochronometers and is strongly sensitive to thermal events. And the minerals’ (U-Th)/He measuring results also could be used to inverse the geothermal history. According to the development of this technique, the factors which are able to influence the helium dating results are studied deeply. On the base of the review of the principle of (U-Th)/He dating, this paper introduces the α-ejection, its effect on helium age calculation and correcting methods, especially analyzes the effect of mineral zonation, crystal shape, surface-to-volume ratio, and other factors on helium age correction. Furthermore, the principle, characters, development and recent achievements of α-ejection correcting models are also summarized in sequence.

Key words: (U-Th)/He dating    Low-temperature thermochronology    α-ejection    Mineral zonation
收稿日期: 2009-04-02 出版日期: 2010-04-10
:  P9  
基金资助:

国家自然科学基金项目“大别造山带侏罗纪的构造热历史重建:裂变径迹和Ar-Ar热年代约束”(编号:40872138);上海市科委学科带头人计划资助项目“西大别造山带俯冲、折返历史重建”(编号:08XD14042);国家自然科学基金群体项目“西太平洋暖池与东亚古环境:沉积记录的海陆对比”(编号:40621063)资助.  
 

通讯作者: 常远     E-mail: 1011changyuan@tongji.edu.cn
作者简介: 常远(1981-),男,吉林长春人,博士,主要从事构造地质学和低温热年代学研究. E-mail:1011changyuan@tongji.edu.cn
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引用本文:

常远,许长海,周祖翼. (U-Th)/He测年技术:α离子射出效应及其校正[J]. 地球科学进展, 2010, 25(4): 418-427.

Chang Yuan, Xu Changhai, Zhou Zuyi. (U-Th)/He Dating Method: α-ejection Influence and Correction. Advances in Earth Science, 2010, 25(4): 418-427.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2010.04.0418        http://www.adearth.ac.cn/CN/Y2010/V25/I4/418

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