首页 | 本学科首页   官方微博 | 高级检索  
     检索      

(U-Th)/He测年技术:α离子射出效应及其校正
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.
作者姓名:常远  许长海  周祖翼
作者单位:同济大学海洋地质国家重点实验室,上海,200092
基金项目:国家自然科学基金,上海市科委学科带头人计划,国家自然科学基金 
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:测年  低温热年代学  离子射出  矿物环带

(U-Th)/He Dating Method:α-ejection Influence and Correction
CHANG Yuan,XU Changhai,ZHOU Zuyi.(U-Th)/He Dating Method:α-ejection Influence and Correction[J].Advance in Earth Sciences,2010,25(4):418-427.
Authors:CHANG Yuan  XU Changhai  ZHOU Zuyi
Institution:State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Abstract:The recently developed (U-Th)/He dating method is one of the important low-temperature thermo-chronological methods 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 very sensitive to ther-mal events.Moreover,the minerals'(U-Th)/He measurement results also could be used to inverse samples'tec-tonic-thermal history.According to the development of this technique,the factors which influence the helium dating results are studied deeply.On the basis of the review of the principle of (U-Th)/He dating,this paper introduces the a-ejection,its effect on helium age calculation and correction,and especially analyzes the effect of mineral zo- nation,crystal shape,and surface-to-volume ratio on helium age correction.Furthermore,the principle,advanta- ges and disadvantages,achievements and further development of a-ejection correcting models are also summarized in sequence.
Keywords:(U-Th)/He  a  (U-Th)/He dating  Low-temperature thermochronology  a-ejection  Mineral zonation  
本文献已被 万方数据 等数据库收录!
点击此处可从《地球科学进展》浏览原始摘要信息
点击此处可从《地球科学进展》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号