| 表生明矾石族矿物40Ar/39Ar年代学概述 |
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| 引用本文： | 杨静,郑德文,武颖.表生明矾石族矿物40Ar/39Ar年代学概述[J].地震地质,2013,35(1):177-187. |
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| 作者姓名： | 杨静 郑德文 武颖 |
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| 作者单位： | 中国地震局地质研究所,地震动力学国家重点实验室 |
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| 基金项目： | 地震动力学国家重点实验室自主研究课题(2009LED2009A05)资助 |
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| 摘 要： | 近年来,激光40Ar/39Ar法成功测定了硫化物矿床氧化带中表生明矾石族矿物(明矾石和黄钾铁矾)的年龄,表明这类矿物适用于 40Ar/39Ar法定年。激光熔样方法引入40Ar/39Ar定年,不仅减少了样品的用量,同时也降低了系统的空白本底水平; 利用阶段加热法得到的年龄谱图,不仅可以有效识别原生矿物的混染和多世代矿物的存在,还可以检测样品中的过剩、继承Ar。虽然风化矿物定年还存在一些潜在的问题,但是只要有科学的采样和合理的分析流程,并结合其他检测手段,就可以获得有意义的风化年龄。这为研究新生代以来化学风化、氧化带形成时间和古气候提供了新的方法。
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| 关 键 词： | 明矾石族矿物 40Ar/39Ar定年 古气候 |
| 收稿时间： | 2012-11-04 |
| 修稿时间： | 2012-11-12 |
40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE ALUNITE-GROUP MINERALS |
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| YANG Jing,ZHENG Dewen,WU Ying.40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE ALUNITE-GROUP MINERALS[J].Seismology and Geology,2013,35(1):177-187. |
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| Authors: | YANG Jing ZHENG Dewen WU Ying |
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| Institution: | (State Key Laboratory of Earthquake Dynamics,Institute of Geology , China Earthquake Administration,Beijing 100029, China) |
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| Abstract: | Recently the successful application of laser heating 40Ar/39Ar dating to supergene alunite-group minerals demonstrates the applicability of the method to dating minerals existing in the oxidation zones of sulfur rich ore deposits. Laser-heating 40Ar/39Ar method not only reduces the amount of samples,but also the system background level; In addition,40Ar/39Ar step-heating dating method can test for the presence of hypogene contaminants,the excess/inherited Ar,and the multiple generations of supergene minerals. Although problems remain in isotopic dating of supergene alunite-group minerals,the systematic sampling and reasonable analysis process,combined with a variety of detection methods,can yield meaningful weathering ages,which will provide a new approach for the research on the timing of continental weathering,the formation of oxidization zones,and climatic desiccation of Northwest China. |
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| Keywords: | alunite-group minerals " target="_blank">40Ar/39Ar datingzz')" href="#"> 40Ar/39Ar dating paleoclimate |
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