(U-Th)/He测年技术:α离子射出效应及其校正

被引：3

作者：

常远

许长海

周祖翼

机构：

[1] 同济大学海洋地质国家重点实验室

来源：

地球科学进展 | 2010年 / 25卷 / 04期

关键词：

(U-Th)/He测年; 低温热年代学; α离子射出; 矿物环带;

D O I：

暂无

中图分类号：

P597.3 [];

学科分类号：

070902 ;

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。

引用

页码：418 / 427

页数：10

共 23 条

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